Monday, November 15, 2010

IMS Electric Meters, Integrated Metering Systems


Integrated Metering Systems, Inexpensive Electric Meters
IMS - Integrated Metering Systems

Since 1989 IMS has been manufacturing current transformer (CT) rated electric submeters. These products quantify electrical energy for dozens of applications, including tenant billing, energy management, solar PV production, cost accounting, or any other application where an accurate, easy-to-install electric meter is required.

Unlike most electric utility meters, our revenue grade CT-rated meters do not plug into a meter socket, so there is no need to re-route power wires. No other electronic meter manufacturer has the confidence and experience to offer a ten-year warranty, and our unique and diverse array of product offerings cover almost any residential, commercial, or industrial application. Our commitment is to 100% customer satisfaction!

Mini Meters

Designed for residential applications, these 100A, 200A, and 400A electric submeters are perfect for metering electric consumption or production for nearly any 120V 2-wire or 120/240V 3-wire application. These revenue-grade single phase (120V 2-wire or 120/240V 3-wire) kWh meters make tenant submetering a snap! Available in indoor flush-mount, outdoor surface-mount, or NEMA 4X Multiple Meter Units (MMUs). Also available in UL Listed, NEMA 4X Multiple Meter Units (MMUs), with up to nineteen meters per enclosure.

Key Features

  • Small size
  • Utility (revenue) grade solid core or easy-to-install split core Current Transformers (CTs)
  • Authorized to apply the UL Mark
  • Approved by Maryland Public Service Commission
  • Approved by California Division of Measurement Standards
  • Approved 2% meter under the California Solar Initiative's PBI program
  • Ten-year warranty

1000 Series

This kWh meter with optional demand function has a large LCD display, pulse outputs, and an RS485 serial port for remote monitoring. Available in an indoor steel or outdoor NEMA 4X enclosure (see links at left), which both are UL Listed.

Models in this series come in the following voltage ratings and configurations:

  • 1 Ph, 2-Wire, 120V
  • 1 Ph, 3-Wire, 120/240V or 2 PH, 3-Wire, 120/208V (same model works with either configuration)
  • 1 Ph, 2-Wire, 277V
  • 2 Ph, 3-Wire, 277/480V

Key Features

  • Large LCD Display showing kWh and (optionally) instantaneous and peak demand with manual keyed reset
  • Utility (revenue) grade solid core or easy-to-install split core Current Transformers (CTs)
  • Reverse energy LED indicator helps ensure proper installation
  • UL Listed
  • Approved by Maryland Public Service Commission
  • Same low price for indoor steel or outdoor NEMA 4X non-metallic enclosure
  • Approved 2% meter under the California Solar Initiative's PBI program
  • Ten-year warranty

2000 Series

Designed for industrial and commercial applications, this UL Listed Three Phase 4-wire revenue grade kilowatt-hour Demand meter is an excellent low-cost option. It features a large LCD display, pulse outputs, an RS-485 serial port, and a ten-year warranty. Same low price for either indoor steel or outdoor NEMA-4X enclosure!

Key Features

  • Large LCD Display showing kWh and (optionally) instantaneous and peak demand with manual keyed reset
  • Utility (revenue) grade solid core or easy-to-install split core Current Transformers (CTs)
  • Reverse energy LED indicator helps ensure proper installation
  • UL Listed
  • Approved by Maryland Public Service Commission
  • Same low price for indoor steel or outdoor NEMA 4X non-metallic enclosure
  • Approved 2% meter under the California Solar Initiative's PBI program
  • Ten-year warranty

3000 Series Multi-Function Smart Meter

(UL Listing Pending. Available Winter 2010)

The IMS 3000 Series Smart Meter line offers more features and functionality than anything ever manufactured by IMS. Incorporating the latest technology and our decades of energy meter design and manufacturing experience, these products will be suitable for a number of energy monitoring, management, and billing applications, all at a remarkably low introductory price. As always, these products come with the IMS ten-year warranty.

Standard Features, All Models

  • kWh, maximum demand, and instantaneous power on LCD display and over Modbus serial port
  • Same meter for 3PH 3W Delta or 3PH 4W Y configurations, 208V or 480V
  • Revenue-grade accuracy with solid-core CTs, or easy to install split core CTs
  • Wide operating range with automatic temperature compensation for maximum accuracy (0.5% error max under all conditions with IMS solid core CTs)
  • Large custom LCD display with scroll button
  • 12VDC mechanical counter output
  • Auxiliary 12VDC output @ 200mA for powering wireless AMR devices
  • Two isolated pulse outputs (kWh & 10wh)
  • Low voltage detection
  • Reverse energy indicators (per phase) on display to ensure correct meter installation

Standard Features on Modbus Serial Port

  • kWh, Max. Demand (kW), Frequency (Hz)
  • Volts, Amps, Watts, VA, and PF per phase
  • Time of Use Metering: Built-in data logger stores kWh, Volts, Amps, and Watts, with date & time stamp from real time clock (65 days of data storage @ 15 minute intervals)

Optional Features

  • Volts, Amps, Watts, VA, and PF per phase on display
  • Bidirectional Metering (kWh; bidirectional Demand upon request)
  • BACnet interface
  • Ethernet interface (IP addressable)
  • Battery backup for real time clock

Current Transformers

Split Core vs. Solid

Should I order split core or solid core CT's? What's the difference?

Solid Core

Solid core Current Transformers (CTs) look like donuts with wires attached. These ring-shaped devices slip over the power lines and measure the electrical current flowing through the line. The CT "secondary" wires connect to the meter, facilitating power and energy calculations.

Solid core CTs are very accurate (0.3% maximum error), small in size, and inexpensive. However, power must be turned off and the circuit opened, generally at a circuit breaker, so that the solid core CT can be slipped over the power line. After installation the power wire must be reconnected to close the electrical circuit. Installation usually only takes a minute or two per CT.

Split Core

Split core CTs can be taken apart, or ‘split' into halves, which negates the need to turn power off and open the circuit during installation. This saves a little installation time, and for critical loads that cannot be switched off, split core CTs are a must. However, split core CTs are more expensive, bulkier, and not as accurate as solid core CTs.


www.anderson-bolds.com

216-360-9800

Friday, September 3, 2010

Solid State Contactors ~ Gavazzi

CARLO GAVAZZI
A u t o m a t i o n C o m p o n e n t s
Announces new Solid State Contactors and reversing contactors.


Carlo Gavazzi has announced the launch of the REC Series of 3-phase Solid State Contactors and Reversing Contactors. The REC Series is twenty times more durable than equivalent mechanical contactors and succeeds in handling high frequency switching. The REC Series is comprised of a 3-pole non-reversing version with three switched phases or a 3-pole non-reversing and reversing versions with two switched phases. The first solution eliminates direct connection from the power supply to motor, while the second one maintains the same performance level while providing relevant cost reduction. The REC is mechanically compatible with Carlo Gavazzi’s CGT-22 line of bimetallic overload modules, by means of a plastic adapter.
In addition to competitive pricing, the REC Series assures substantial savings, as it
reduces system downtime and maintenance costs. The solid state contactors are provided
with a 1,600 Vp blocking voltage option that enhances their surge current ratings.
The REC Series is cUL listed as a motor starter and complies with the NMFT/NMFT7
requirements. The main technical features include:


• REC2 / REC3 – direct starting of
3-phase motors up to 5Hp at 480VAC
• REC2R – direct starting and reversing of
3-phase motors up to 5Hp at 480VAC
• Full load rating at 40°C / 104°F
• Instant-on switching
• Rated operational voltage up to 600VAC
• AC or DC control options
• Mechanical contactor resemblance with
covered heat sink
• Connects to CGT-22 overload module
• Control status LED indication
• DIN-rail or panel mounting
• cULus listed, CE and RoHS compliant


REC is an electronic contactor intended to replace the traditional mechanical counterpart used to switch three phase motors. The range includes 2 and 3 phase switching versions up to 4kW and 600Vrms.
Options with high surge current and I²t for fusing purposes are also available. The relay switches instantaneously upon application of the control voltage to emulate mechanical relay operation. A covered heatsink resolves any issues with regards to cables running close to the heatsink and eliminates the need for protective earth cabling. The product can be mounted on DIN-rail or on a panel. Note:
Specifications stated at 25°C unless specified.


The solid state contactors are available from Carlo Gavazzi’s North American authorized stocking distributor Anderson-Bolds.

Tuesday, August 31, 2010

Watlow Temperature Controls ~ EZ-Zone


Watlow is standardizing on their EZ Zone controllers, the newest and very highly capable temperature / process controllers on the market. All the controllers share the same base chip/board so can talk to each other and are programmed in very similar fashion.



Watlow's temperature and process controllers offer easy-to-use, accurate and reliable solutions for applications requiring single and multiple loops of control.

Temperature and process controllers include one or more sensor inputs with open-loop break detection and multiple outputs for control and alarms. Various configurations offer auxiliary analog inputs, automatic tuning, TRU-TUNE®+ adaptive control, and ramp and soak profiling. Output options include analog process, switched DC and mechanical, solid state and no-arc hybrid relays. Other features include countdown timer, user-customizable menu, burst fire output control, failed heater/load detection and NEMA 4X (IP65, IP66).

EZ-ZONE controllers offer additional features and options including application blocks with timers and counters, on-board data logging, SENSOR GUARD backup to protect loads should a sensor fail, AUTO CLONE™ automatic configuration backup and restore, standard bus communications, wide ambient-temperature operating range, Class I, div 2 rating, SD card expandable memory, USB connectivity and free configuration software.

The EZ-ZONE® PM panel mount controller from Watlow®
offers control options to reduce system complexity and the
cost of thermal loop ownership. You can order the EZ-ZONE
PM as a PID controller, an over/under limit controller or these
functions can be combined into an integrated controller. You
also have the option to integrate a high amperage power
controller output with a high-performance PID controller and
an over/under limit controller in one space-saving, panel
mount package. A number of communication options are
available to support your connectivity needs.
Because the EZ-ZONE PM controller is highly scalable, you
only pay for what you need. This controller is available in 1⁄32,
1⁄16, 1⁄8 and 1⁄4 DIN panel mount packages. If you are looking for
a PID controller, an over/under limit controller or an
integrated controller, the EZ-ZONE PM will make your
life easier.

The Watlow EZ-Zone PM express panel mount controller is an industry leading PID controller tht allows for optimal performance utilizing simple contol and menu functionalitywithout complex features. The EZ-Zone PM express is ideally suited for basic applications and usage levels.

The Watlow EZ-Zone PM express is the next generation of controllers leveraging the strong legacy of Watlow's Series 93, series 935 and series SD controllers where easy to use features are needed for basic applications. It includes one universal input and the option for up to two outputs and is available in 1/32 or 1/16 DIN panel mount packages.

The EZ-ZONE® RM controller family offers products that
simplify thermal system management. The EZ-ZONE RM
family is comprised of six module types: an integrated on
or off PID control, monitoring and over/under temperature
limit module, a high-density on or off PID control module,
a high-density limit only module, an input/output (I/O)
expansion module, a high-density monitor/scanner module
and a data logging and field communications access
module. A system is configured by connecting any
combination of module types to address specific application
needs. The EZ-ZONE RM is extremely flexible and scalable
allowing you to mix and match I/O to configure 1 to 152
control loops and up to 256 monitor points.



Please visit our Watlow Web site.

or call 216-360-9800

Thursday, July 15, 2010

Parker valves, 204/209/304/309 Series

Parker Solenoid Valves

Parker Fluid Control Division, manufacturers of the Skinner and Gold Ring lines of solenoid valves and the Sinclair Collins line of process control valves, has introduced an integrated coil for its Series 204 and 304 solenoid valves. Featuring easy installation, the integrated coil is the latest in the division's list of flexible production options for these small yet powerful solenoid valves.

The patent-pending NEMA 4X coil with rotating conduit hub permits easy installation. The valve lines also include interchangeable AC and DC coils as well as a tab coil for flexible production possibilities. Both the Series 204 and 304 also feature a complete line of high-temperature watertight coil designs to meet the most demanding environmental conditions.

The Series 204 (two-way) and the Series 304 (three-way) are available as normally closed and normally open valves. Maximized flow rates are delivered through orifice sizes ranging from 1/32" to 5/32". Additionally, the valve line is manufactured with 1/8" port size (NPT) connections.

The new product lines offer a family of direct-acting solenoid valves for air and liquid (including light oil) applications. These valves meet virtually all of today's commercial, industrial, mobile, instrumentation and medical market needs. State-of-the-art performance characteristics ensure a long life and maximized pressure ratings. Economy models are available for less demanding applications.

The integrated coil has been evaluated by Underwriters Laboratories and complies with the RoHS (Restrictions of Hazardous Substances) standard under the European Directive 2002/95/EC.

Visit us online at Anderson-Bolds/Parker

Thursday, July 8, 2010

TRC High Power GFCI's ~ Ground Fault Circuit Interrupter


Anderson-Bolds and TRC

Avoiding electrical accidents and equipment damage are keys to reducing liability and increasing productivity. Minimum ground fault protection can be incorporated into the main power disconnect device and could be considered adequate for the entire system. However, in such a design, any downstream ground fault could trip the main protective device resulting in a complete substation power outage. The NEC’s purpose, in its own words, is “the practical safeguarding of persons and property…but not necessarily efficient, convenient, or …for good service…” (Article 90.1A, B). In other words, system reliability is left to common sense and good engineering design practices. For this reason ground fault protection of the circuit may be highly desirable and recommended for reliable and continuous operation.
TRC engineers designed the HD-PRO models specifically for high current, rugged environments and these models are field-proven in all kinds of tough applications. The entire HD-PRO family (120V/30A to 600V/80A) is designed to trip within 25 milliseconds after ground fault detection at an adjustable selected trip level of 6, 10 or 30 mA.
ARC WELDING APPLICATIONS
Arc welding is described as using a welding power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point. The process of arc welding is widely used because of its low capital and running costs.
Arc welding can use either direct (DC) or alternating (AC) current as the power source to create the arc. The arc process needs a large amount of current, up to 500A, but at a relatively low arc voltage; 10 to 40V, with a typical high voltage main power supply, and 230 to 400V, that must be reduced. In all manual arc welding operations the main risk is electric shock, most likely from contact with bare live parts of the welding circuit. Appropriate protective clothing and ground fault protection is the first line of defense in the event of an electrical hazard from stray currents. Bad equipment can be replaced in a short time; however, fire and serious injury or death caused by a ground fault could shut down a facility for several days or weeks.
How to avoid electrical shock: Always use a local ground fault circuit interrupter (GFCI) with welding equipment and, prior to use, always test the GFCI for proper operation. Use well-insulated electrode holders and cables. Make sure welding cables are dry and free of grease and oil. Keep welding cables away from power supply cables. Wear dry hole-free gloves, clothing should also be dry. Insulate welder from the ground by using dry insulation such as rubber mat or dry wood. Ground frames of welding units. Never change electrodes with bare hands or wet gloves.
Fortunately, ground fault protection is easy to apply if you understand the basics. Simply put, a ground fault occurs when electrical current finds a bridge to ground via worn insulations, conductive dusts, water or other “soft grounds”, instead of the normal path back to its source. More than 80% of short circuits in equipment are ground faults, and 90% of these events are due to insulation deterioration on wires and cables. In cases where workers accidentally bridge power and ground, current in the mA range can send their heart into ventricular fibrillation.
A GFCI functions by measuring the outgoing amperage to a piece of equipment and comparing it against the return amperage. If a difference (leak) of >5 milliamps occurs (or set higher for certain equipment), the GFCI stops the flow of electricity to protect equipment and workers from potential electrocution.
Avoiding electrical accidents and equipment damage are keys to reducing liability and increasing productivity. Minimum ground fault protection can be incorporated into the main power disconnect device and could be considered adequate for the entire system. In such a design, however, any downstream ground fault could trip the main protective device resulting in a complete substation power outage. The NEC’s purpose, in its own words, is “the practical safeguarding of persons and property…but not necessarily efficient, convenient, or …for good service…” (Article 90.1A, B). In other words, system reliability is left to common sense and good engineering design practices. For this reason ground fault protection of the circuit may be highly desirable and recommended for reliable and continuous operation.
Also, in order to comply with OSHA Regulations’ recent change, “construction-like” work using temporary power arrangements which takes place in the nation’s manufacturing plants, refineries, processing facilities and other locations, must be done with workers using GFCI protected equipment.



Industrial pressure washers are powerful tools used for washing buildings, bricks, floors, storefronts, parking lots, dumpsters,
bus fleets, machinery, farm equipment, engines and more. From industrial power plants to disaster clean-up you will find all
types of high end power pressure washers being used for many industrial applications. These machines are sophisticated
and built with more durable pumps and components then the residential units. They are also used in extreme environmental
conditions requiring more power; thereby posing a greater safety risk to individuals if not used properly.
A “Ground Fault” is a dangerous electrical condition where current flows unintentionally
between a live conductor and ground. A severe or fatal electric shock can occur when a user
touches the pressure washer if the machine is ungrounded. This could happen if the power
cord to extension cord connections become wet or a fault exists within the pressure washer’s
sophisticated electrical system. GFCI’s prevent possible electrocution and equipment damage
due to electrical malfunction. Once the GFCI trips, the power is interrupted, stopping the
pressure washer power and making it electrically safe for people and preventing costly
equipment damage.
The 1987 edition of the National Electrical Code requires that pressure washers be protected by ground fault interrupters to
prevent electrocutions. Also, the Underwriters Laboratories revised UL1776 requires the use of GFCI’s for all UL listed
pressure washers effective as of May 6, 2000.
Avoiding electrical accidents and equipment damage are keys to reducing liability and increasing productivity. Guidelines for
electrical safety are:
Always use and test the ground fault circuit interrupter (circuit breaker or outlet) before using a pressure washer.
Always plug a properly grounded pressure washer into a properly grounded receptacle.
Never remove the grounding prong from the pressure washer’s power cord plug or from the extension cord.
Always have a qualified electrician check the pressure washer for electrical problems after it has tripped a circuit
breaker.


Moving large heavy loads is crucial to today's manufacturing and construction industries. Hoists are one of the top

productivity-enhancing tools found almost anywhere goods are regularly moved, worked on and/or mounted into an
assembly. Some hoists use chains, ropes, or cable, but regardless, most use A/C motors. A burnt out motor can be replaced
in a short time, but fire or serious injury or death caused by a ground fault could shut down a facility for several days or

weeks. Fortunately, ground fault protection is easy to apply if you understand the basics.
A ground fault occurs when electrical current finds a bridge to ground via worn insulations,
conductive dusts, water or other “soft grounds” instead of the normal path back to its source.
More than 80% of short circuits in equipment are ground faults, and 90% of these events are
due to insulation deterioration on wires and cables. In cases where workers accidentally bridge
power and ground, current in the mA range can send their hearts into ventricular fibrillation.
A GFCI (Ground Fault Circuit Interrupter) functions by measuring the outgoing amperage to a
piece of equipment and comparing it against the return amperage. If a difference (leak) of > 5
milliamps occurs (or set higher for certain equipment), the GFCI stops the flow of electricity to
protect equipment and workers from potential electrocution.
Avoiding electrical accidents and equipment damage are keys to reducing liability and increasing productivity. Minimum

ground fault protection can be incorporated into the main power disconnect device and could be considered adequate for the
entire system. In such a design, however, any downstream ground fault could trip the main protective device resulting in a

complete substation power outage. The NEC’s purpose, in its own words, is “the practical safeguarding of persons and

property…but not necessarily efficient, convenient, or …for good service…” (Article 90.1A, B). In other words, system
reliability is left to common sense and good engineering design practices. For this reason ground fault protection of the
circuit may be highly desirable and recommended for reliable and continuous operation.

Guidelines for electrical safety are:
Know where the GFCI is located in the hoist power system. If there is not a GFCI installed, have one installed local

to the hoist to confirm you have protection.

Always test the GFCI before using the hoist.
Always have a qualified electrician check the hoist for electrical problems after it has tripped a GFCI.

CONVEYORS

Conveyors are commonly found in factories, industrial facilities, warehouses, distribution centers and in a large number of
manufacturing workplaces. A top productivity-enhancing tool, conveyor systems are used in almost every manufacturing
environment where goods are regularly moved from one location to another. Because of this, conveyor injuries in the U.S.
may cost employers millions of dollars each year; however, with the right processes, design and safety considerations,
employers can reduce cost and liability.
Conveyors are often driven by variable speed electric motors integrated (hardwired) into
complex power systems. As with any electronic equipment they are subject to failure for many
conveyor location to isolate equipment protection and to test the GFCI prior to equipment use.
possible reasons. To protect people who use electrically-powered conveyors, each conveyor
must be equipped with a “Ground Fault Circuit Interrupter” (GFCI) preferably localized at the
GFCI’s prevent possible electrocution and equipment damage due to electrical malfunction.
Once the GFCI trips, the power is interrupted, stopping the conveyor system and making it
electrically safe for people and preventing costly equipment damage.
Ground fault protection is an important consideration for virtually all electrical equipment. A Ground Fault is a dangerous
electrical condition where current flows unintentionally between a live conductor and ground. This could happen if the power
unit or power cables become damaged, wet or a fault exists within the conveyor’ssophisticated electrical system. Avoiding
electrical accidents and equipment damage are keys to reducing liability and increasing productivity.
Guidelines for electrical safety are:
Know where the ground fault circuit interrupter is located in the conveyor power system. If there is not a GFCI
installed, report this to your safety officer.
Always test the ground fault circuit interrupter before using the conveyor.
Always have a qualified electrician check the conveyor for electrical problems after it has tripped a groundfault
circuit interrupter.




TRC engineers designed the HD-PRO models specifically for high current, rugged environments and these models are field-proven in all kinds of tough applications. The entire HD-PRO family (120V/30A to 600V/80A) is designed to trip within 25 milliseconds after ground fault detection at an adjustable selected trip level of 6, 10 or 30 mA.
Before the development of the HD-PRO Series, facilities with high current – high voltage equipment or three phase systems employed expensive ground fault breakers at the source of the branch circuit, or went without ground fault protection, leaving personnel and equipment unprotected.
Circuit breakers can withstand high current levels but have short mechanical lives and were not designed for switching duty. Localized ground faults, with circuit breakers, either shut down the whole branch circuit or were overloaded because the available devices were not portable and were often too costly.
The HD-PRO Series utilizes contactors that are fully rated for motor switching demands. In addition to being far less expensive than three phase breakers, the HD-PRO models protect expensive high current – high voltage equipment at the point of use while offering substantial shock protection for personnel.
TRC is an internationally recognized leader in electrical safety products
that protect equipment, prevent electrical fires and protect against electrocution and serious injury from electrical shock.
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Thursday, June 3, 2010

Fire Shield Cords and strips prevent fires



Fire Shield products are ideal for home, office, and campus environments such as residence halls, labs, classrooms, libraries and other facilities. Fire Shield cords, with specially designed shielded conductors, are able to detect series faults and line-to-neutral faults, significantly reducing fire hazards. Available as power strips, surge protectors, appliance cords and extension cords. Many universities are requiring Fire Shield products be the only strips used on campus. Based on estimates by the US Consumer Product Safety Commission (CPSC), there are 155,900 electrical fires attended annually by the fire service in the US, resulting in nearly: $1.68 billion in property damage 6,810 injuries 800 deaths Each year across America, college and university students, faculty and staff experience a growing number of fire related emergencies. Annually, there are approximately 1,600 documented fires in college dormitories and Greek housing. In fact, according to the National Association of State FireMarshals (NASFM), fire fighters respond to fires in college dormitories four times a day and numerous fires go unreported. This number does not include the significant amount of fires in other areas such as classrooms, labs and off-campus housing. CPSC statistics indicate that 50%of all electrical fires, attended and unattended by the fire service, were caused by faulty flexible power cords-extension cords, surge strips, and appliance cords. Flexible cords fail in a variety of ways, including: Pinched, Crimped or Frayed Cords Overheated/Overloaded Cords Application-related Damage (i.e. Room air conditioners, heaters, tools, vacuums, etc.) Frequent Movement of Appliance Normal Aging and Wear Extension Cords and Surge Strips are the Solution TRC, the leader in ground fault sensing technology, developed Fire Shield’s unique patented design to provide built-in fire protection in a power cord set. This technology is available as an extension cord and a variety of surge strips. It is also being utilized by many portable room air conditioner manufacturers. The Fire Shield Surge Strips are the only surge strips in the world that can protect against all of the following: Cord Fires Surges Overloads Standard ground fault, surge and overload devices alone cannot prevent cord fires. The patented, UL approved Fire Shield is the only cord set in the world that provides cord fire protection. Fire Shield monitors the leakage current, thus sensing any damage to the cord and shuts off the power safely in 25/1000ths of a second. Using Fire Shield: Protects electrical equipment from damaging power surges and spikes. Shuts off the electricity before a fire can start if it detects damage to its power cord. TRC is actively involved in the following university and safety associations: The Center For Campus Fire Safety, National Association of College Stores (NACS), Association ofCollege and University Housing Officers - International (ACUHO-I), Association of Higher EducationFacility Officers (APPA), International Association of Campus Fire Safety Officials (IACFSO), NationalAssociation of State Fire Marshals (NASFM), National Fire Protection Association (NFPA), NationalSafety Council (NSC) and Consumer Electronics Association. Buy online at Anderson-Bolds 216-360-9800

Wednesday, June 2, 2010

TRC Digital Voltage Monitor ~ New-2010

TRC Digital Voltage Monitor AECM 20020

This compact, easy to use instrument is made with advanced microelectronics and
provides accurate testing and monitoring of electrical outlets and systems. Constantly
monitors voltage and frequency indicating potential improper polarity and ground
wiring. Its small size and rugged construction allows for convenient installation in an
electrical outlet or use as a portable service tool.
Voltage is measured as RMS which is much more precise than AC average. RMS
metering is the only method that can accurately measure all AC power sources. The RMS
voltage and frequency readings are ideal for monitoring modified sine waves such as
solid-state generators, inverters and Uninterruptible Power Supply (UPS) products.
The Digital Monitor display will alternate between line voltage in RMS volts and
line frequency in Hertz. The LCD display shows an “F” in front of the reading to denote
frequency.
Three display modes are available:
Alternating Voltage & Frequency( VOLT/FREQ.)
Voltage only (VOLTAGE)
Frequency only (FREQUENCY)
Pressing the MODE button on the front of the Digital Monitor will cycle through the
display modes.
Both voltage and frequency are constantly monitored regardless of the
display mode.


FEATURES
AECM20020
Accurate Testing and Monitoring of All AC Power Source Types
RMS Voltage and Frequency Meter
Multi-tone Fault Alarm
Hands-free Auto Reset
Advanced Microelectronics
One Button Operation
Wiring Diagnostics
LCD Display with LED Backlight


TECHNICAL DATA
Voltage Range 85 to 150 Vac RMS
Frequency Range 40 / 80 Hz
Operating Current 0.02 Amp
Under Voltage Alarm <102>135 Vac RMS
Under Frequency Alarm <55>65 Hz
Outlet Type 120V/15A single phase
Operating temperature +32°F to +125°F

Anderson-Bolds stocks TRC products

216-360-9800

GFCI vs ELCI




Shock protection for personnel

GFCI Ground Fault Circuit Interrupters


TRC GFCI Product Features
Can provide protection for two, three or four wire circuits
Grounded neutral protection
Open neutral protection
Lighted and/or mechanical trip indicator
Radio frequency interference suppression to protect against nuisance tripping
Trip level 4-6mA
Provides protection in reversed polarity of input line and neutral
Complies with UL & CSA requirements
Available in 120V and 240V with load currents up to 30A


Electrical equipment protection

ELCI Equipment Leakage Current Interrupters


TRC ELCI Products Features
Can provide protection for two, three or four wire circuits
Mechanical trip indicator
Radio frequency interference suppression to protect against nuisance tripping
Trip levels 10mA, 15mA and 20mA
Does not open contacts with loss of primary power
Provides protection in reversed polarity of input line and neutral
Complies with UL & CSA requirements
Available in 120V and 240V with load circuits up to 50A
Special ratings are available





Sunday, May 9, 2010

Heating Glossary ~ Watlow - Chromalox -

Heating Glossary for Electric Heating

visit Anderson-Bolds for all your heating needs.

Absolute Zero – The lowest theoretical temperature. At absolute zero, a body would have no molecular motion of heat energy. Abso lute zero is the zero point on the Rankine and Kelvin scale. (-273.15˚C or-459.67˚F)

Accuracy Calibration Accuracy – the potential error of a device compared to a physical constant or agency standard.

    Control Accuracy – maintaining a process at the desired setting. The errors or combination of errors in the entire system including the sensor, control, power, load and design inefficiencies effect control accuracy.

    Display Accuracy – the amount of potential error between a mea sured value and the control’s displayed value.

    Set Point Accuracy – the potential error between a measured value and the control setting.

Address – for digital communication between host computer and control, is a numerical value, typically between 1 and 255. The same address must be entered into both the computer program and the specific control to be addressed, or communicated with.

Alarm – a control condition or function, indicating that the process is at a predetermined amount above and/or below the set point.

Alarm relay options – normally energized (relay energized when not in alarm) normally de-energized (relay not energized unless in alarm). Latching means a reset button must be pushed when the temperature drops below the alarm setting plus dead band.

Alarm Type – typical choices for PID controls are: disabled, high, low, + deviation, -deviation, +/- deviation., and event (for ramp soak units.)

Algorithm – a set of rules with a fi nite number of steps for solving a problem.

Alternating Current (AC) – an electrical power system where the voltage reverses, alternating negative and positive. Typical frequency is 50 or 60 Hz. (cycles per second)

Ambient Compensation – the ability of an instrument to compen sate for changes in the ambient temperature so that the changes do not effect control accuracy.

Ambient Temperature – the temperature of the immediate sur roundings in which equipment is to operate.

AWG (American Wire Gauge) – also known as B and S wire gauge. Standard system to specify the diameter of wires for both power and control circuits. The larger the gauge number, the smaller the wire diameter.

Ampere (amp) – the rate of flow of current in a circuit.

Analog Indication – a meter with graduated scale and a pointer that moves to indicate process condition.

Analog Output – a voltage or current signal that is a continuous function of the measured parameter.

Analog Set Point – potentiometer adjustment of the control setting

Anneal - To relieve stress in a metal or glass material by heating to just below its melting point, then gradually cooling to ambient temperature. Annealing lowers tensile strength while increasing flex ibility. Tubular heaters are annealed prior to forming.

ANSI – American National Standards Institute

Anti-reset Windup – a feature in 3 mode (PID) controls which prevents the integral (automatic rest) circuit from functioning when the temperature is outside the proportional band.

ASME – American Society of Mechanical Engineers.

ASTM – American Society for Testing and Materials.

Atmospheric Pressure (Standard) – Pressure exerted by the earth’s atmosphere on the objects within. Measured at 60˚F (15˚C), at sea level, standard atmospheric pressure is 14.7 psia.

Automatic Reset (Integral) – the integral function of a control that automatically compensates for the difference between the set point and the actual process temperature. A signal moves the proportion ing band up or down to correct for the droop or offset error.

Automatic Tuning (of control parameters) – a control that calcu lates the optimum PID parameters with a built-in software algorithm to eliminate manual tuning efforts.

Auxiliary Output – additional outputs for control of functions other than the primary control output, such as lights, buzzers, horns or gas purges that are triggered by the control alarm function.

Auxiliary Setpoint – an alternate set point on some PID controls, which can be selected from a button or external signal.

AWG – American Wire Gauge.

Band and Nozzle Heaters – component heaters designed to heat cylindrical objects such as plastic extruders. A variety of sizes and constructions are available.

Bandwidth – the total temperature variation measured at some point in the system, normally the process.

Baud Rate – In serial communications, the rate of information transfer in bits per second. Must be set for the same value in the controller and the host computer program. Typical values are 1200, 2400, 4800, 9600, and 19200. The control, computer and wiring must be able to operate at the baud rate selected.

Bend Radius (minimum) – the minimum radius for bending a wire, heating element or heat trace cable, without damage.

Blackbody – a theoretical object that radiates the maximum amount of energy at a given temperature and absorbs all energy incident upon it.

Braid – a flexible woven covering, usually of metal wire, covering an insulated wire to provide a ground path (or shield) or to protect from mechanical damage.

Boiling Point – the temperature at which a substance in the liquid state transforms to the gaseous state. Commonly refers to the boil ing point of water (100˚C or 212˚F at sea level).

BTU – British Thermal Unit; the amount of thermal energy required to raise one pound of water, 1˚F .

Bulb & Capillary – refers to thermostat construction which has a bulb filled with a fluid in the process. The increasing heat forces the fluid through a narrow tube into a bellows. The bellows actuates a snap switch, at a temperature determined by the knob setting which moves the switch toward or away from the bellows.

Bulkhead Threaded Fittings – available on tubular heaters, factory brazed, to allow heaters to be mounted through the wall of a tank or duct, etc.

Bumpless Transfer – The smooth, automatic transition from automatic control (closed loop) to manual control (open Loop). The control output is maintained during the transfer.

Burst Firing – a fast cycling control output, typically 3-32VDC, used in conjunction with a solid state relay.

Calibration – the process of adjusting an instrument so that the indication is accurate compared to the actual value.

Calorie – the amount of thermal energy required to raise one gram of water 1˚C at 15˚C

Cartridge and Immersion Temperature Controllers – are mechani cal Thermostats with operation based on the difference of expan sion of different metals.

Cartridge Heaters – cylindrical heaters with leads exiting one end. Most often inserted in drilled holes in platens and molds to heat blocks of metal. A variety of standard diameters, lengths and watt ages are available, as well as special lengths, electrical ratings, and lead wire options.

Cascade – Control function where the output of one control loop provides the set point for a second loop, which determines the control action.

CE – A mark that designates compliance with European Union (EU) requirements for products sold in Europe

Celsius – (Centigrade) a temperature scale with 0˚C defined as the ice point and 100˚C as the boiling point of water at sea level.

Ceramic Beads – beads of ceramic material, with various hole sizes, intended to insulate bare high temperature wire, to prevent short circuits.

Ceramic Fiber – a light weight, low density fiber, typically used as a high temperature insulation or a refractory

Ceramic Post Terminal Insulators – used to cover the terminals of common strip heaters to prevent personnel contact with electrical hazards. Sold in pairs.

cfm – the volumetric flow rate of a liquid or gas in cubic feet per minute.

Chatter – the rapid cycling of a relay due to too narrow a bandwidth in the control.

Circuit – a complete or partial path over which current may flow.

Circulation Heaters – heaters for fluids or gasses consisting of an insulated pipe body with an immersion heater inside. Various sheath and pipe body materials are offered to heat a variety of material to a range of temperatures. Mechanical thermostats are included on some models. Options include mechanical or electrical controls, built-in sensors, baffles, and ASME design and certification. Com plete skid mounted systems with panels are also available.

Closed Loop Control – a control system in which process temperature changes are detected by a sensor. The feedback from the sensor allows the control to make adjustments for accurate system regulation.

Cold Junction Compensation – a temperature sensitive device that prevents changes in the ambient temperature from affecting the cold junction of a thermocouple.

Cold Length – the distance from the end of the sheath to the heated section of a tubular or other similar heater.

Comfort Heaters – heaters, usually for the heating of areas to maintain comfort of the occupants. Generally not for use in areas above 100˚F. A wide variety of types (convection and fan forced) are available for use in ordinary, corrosive, and explosion hazard areas.

Common Mode Line Filter – a device to fi lter noise signals on both power lines with respect to ground.

Common Mode Rejection Ratio – the ability of an instrument to reject interference from a common voltage at the input terminals with relation to ground. Expressed in dB (decibels).

Compression Fittings – bulkhead fi ttings designed for customer installation on round tubular heaters, to allow heaters to be mounted through the wall of a tank, duct, etc.

Conduction – the transfer of heat from one material at a given tem perature to another material at a lower temperature, while in direct contact with each other.

Conductivity – the ability of heat or electricity to flow through a material.

Constant Wattage – refers to a type of heat trace cable having a constant wattage output regardless of the surrounding temperature.

Continuity Check – A test that determines whether current can fl ow throughout the length of a circuit.

Control Loop – the basic control loop of any automatic control system consists of: 1) variable (process) 2) sensor 3) error detector (of control) 4) control 5) final control element (relay, SSR, SCR) 6) temperature indication

Control Mode – the method in which the control restores the sys tem temperature to set point. On/Off, proportioning, and PID are the most common control modes.

Control Type – options are direct acting (cooling) and reverse acting (heating).

Convection – the transfer of heat from a source or higher temperature area in a gas or liquid by the movement and mixing of the masses.

CSA – abbreviation for third party testing and approval agency, Canadian Standards Association

C-UL – this is an acceptance of UL (Underwriter’s Laboratory) approval of a product. Often accepted by customers who would normally require CSA approval.

CPS – Cycles per Second (See Hertz).

Current – measured in amperes (A), is the flow of electricity. One ampere is one coulomb per second.

Current Limiting – a means to limit the current delivered to a load by a power control device, usually an SCR.

Current Proportioning – a 4-20 milliamp (typical) current output which provides a current proportional to the amount of control required.

Current Transformer – a transformer, usually toroidal (doughnut) shaped, designed to accommodate an electrical conductor, and pro vide a reduced, but linear output at a lower current, for instrument use. Typically specifi ed by ratio i. e. 100:1

Cycle Rate (or Cycle Time) – in a time proportioning control, the period (usually in seconds) of time that is required to complete one on/off cycle once temperature has settled at the center of the proportioning band.

Data Logging – Recording a process variable over an extended period of time.

Dead Band (differential) – is the difference in degrees between temperature control turn on an turn off. This parameter is for on-off controls. It also applies to overtemperature controls.

Default Parameters – The programming instructions permanently written in microprocessor software.

Defi nite Purpose Magnetic Contactor – similar to a motor starter relay, for use with on-off controllers for slow processes. Available with optional enclosures for general, wet, and explosion proof areas.

Density – mass per unit of volume, such as lbs./cu.ft.

Derivative – (See Rate)

Deviation – the difference between the selected value and the actual value.

Deviation Alarm – an offset value that follows the set point. If the set point is 300˚F and the Deviation Alarm value is +20˚F (or 320˚F), then the set point is changed to 350˚F, the Deviation Value alarm would be 350˚F plus 20˚F (or 370˚F). See Process Alarm.

Deviation Meter – the display of process temperature on meter that indicates difference of or deviation of the process temperature from the set point.

di/dt – the rate of change of current vs. time. Filtering on large SCR units may be necessary to prevent damage from large current changes in small time periods

Dielectric – an electrical insulator - a material with low electrical conductivity.

Dielectric Strength – an amount of voltage that an insulating mate rial can withstand before an electrical breakdown occurs.

Differential – in an on/off control, the temperature difference ex pressed in degrees between where the control switches off and the control switches on.

Differential Mode Line Filter – a device to fi lter noise signals between two power lines.

Digital Indication – the actual process temperature in indicated by LED or LCD display.

Digital Set Point – the desired temperature value is set by means of up-down pushbuttons or pushwheel switch.

DIN – Deutsche Industrial Norms, a German agency that sets engineering standards. Control panel hole size cutouts are typically based on DIN dimensions

Diode – A device that allows current to flow in only one direction.

Direct Current (DC) – an electric current flowing in one direction.

Disconnect – a control panel mounted main switch, which provides a means to turn off power in the panel before opening the door for servicing. Most disconnects do not provide overcurrent protection. This must be provided upstream using fuses or circuit breakers.

Dishwasher Heaters – immersion heaters with terminal housing and built-in controls, designed for use in commercial dishwashers

DOT (Demand Oriented Transfer) – an SCR power control system using the smallest time base possible. For example, 25% output would be 1 cycle on, and 3 cycles off.

Drift – a change in a value over a long period due to changes in fac tors such as ambient temperature, time or line voltage.

Droop – in time proportioning controls, the difference in tem perature between the set point and where the system temperature stabilizes. Corrected by automatic or manual reset.

Drum Heaters – flexible heaters designed to heat or maintain the temperature of standard 5, 16, 30 and 55 gallon drums. A selection of ratings are available, some with thermostats.

Dry Well Heater – a heater designed to be installed in a dry area, usually a pipe, to heat the pipe, with the ultimate purpose of heating liquid surrounding the pipe.

Dual Output – the primary control output will regulate the process temperature. A secondary control output will be utilized for process cooling or as an alarm.

Duty Cycle – the ratio of on time to on time plus off time, expressed as a percentage.

dv/dt transient protection – fi ltering to limit voltage vs. time pre sented to an SCR. Helps protect SCR’s against transient voltages.

Efficiency – the amount of useful output versus energy input, expressed as a percentage.

Electric Stud Heater – a long cylindrical heater designed to be inserted into the hollow bolts of large machinery to obtain “shrink fi t tightness” when the bolts cool.

Electromagnetic Interference (EMI) – electrical and magnetic “noise” than can be generated when switching AC power. EMI can interfere with the operation of microprocessor based controls.

Element Clamps – cast iron clamps are offered to clamp strip and ring heaters to surfaces for conduction heating of tanks, etc.

Emissivity – The ratio of radiant energy emitted from a surface compared to the radiant energy emitted from a black body at the same temperature.

Endothermic – a process is endothermic when it absorbs heat.

Enthalpy – the sum of the internal energy of a body and the product of its volume multiplied by the pressure used to evaluate the energy change occurring when a vapor or gas is heated. Expressed in units of Btu/lb. or Joules/gram.

Error – the difference between the correct value and the reading or display value.

Exothermic – a process is exothermic when it generates heat.

Explosion Proof Strip Heater – used to heat by conduction in areas with explosion hazards.

Explosion Proof Terminal Housing (or Enclosure) – an enclosure, housing, or panel which will contain a internal gas explosion. This prevents an explosion from setting off surrounding area. Housing contents must not produce surface temperature which would ignite flammable gases or vapors in the vicinity.

Extension Wire – wire intended to connect a sensor (typically a thermocouple or RTD) to a panel or control. Thermocouple wire must be same type as TC (J for J). RTD wire may be copper.

External Interlock – provided on most Chromalox panels, the interlock is a jumper, which turns off the load when interrupted. Typically connected to a flow or pressure switch for moving systems to protect against a no flow condition.

Event – a programmable On/Off output used to signal peripheral equipment or a process.

Fahrenheit – a temperature scale with 32˚F defi ned as the ice point and 212˚F as the boiling point of water at sea level.

Flanged Immersion Heaters – immersion heaters with mounting flanges (ANSI standard and others). Most offer a choice of terminal housings for various environments. Optional sheath thermocouples are also available.

Flexible Heaters – available in many standard sizes and ratings, most are constructed of silicone rubber, with internal winding. Specials with accessories such as thermostats, cords and plugs are available, as well as unique shapes.

Flow Rate – speed or velocity of fluid movement.

FM (Factory Mutual Research Corporation) – a third party approval agency, which tests and approves equipment for service in various areas and conditions.

Form A Relay – Single pole, single throw relay with Normally Open (NO) and common contacts. When coil is energized, the contacts will close.

Form B Relay – Single pole, single throw relay with Normally Closed (NC) and common contacts. Contacts are open when coil is energized.

Form C Relay – Single pole, double throw relay with Normally Open (NO), Normally Closed (NC) and common contacts. Can be selected as Form A or Form B contact.

fpm – flow velocity in feet per minute.

fps – flow velocity in feet per second.

Freezing Point – the temperature where a material changes from a liquid to a solid.

Frequency – the number of event occurrences or cycles over a specifi ed period of time.

Fuse – A device that interrupts power in a circuit when an overload occurs.

Fuzzy Logic – An artifi cial intelligence technique that allows control decisions to be made upon approximate or incomplete information. It is a continuous decision making function that can prevent initial overshoot and set point differentials.

GFCI – (Ground Fault Circuit Interrupter) – an electronic circuit which monitors the current flowing from a conductor to a ground reference. When the current exceeds a predetermined value, the GFCI shuts the circuit down.

GIGA – the prefi x for one billion (G).

gph – the volumetric flow rate in gallons per hour.

gpm – the volumetric flow rate in gallons per minute.

Ground – the electrical line having the same potential as the sur rounding earth; the negative side of a DC power supply; the refer ence point for an electrical system.

Grounded Junction – A thermocouple junction in which the sheath and conductors are welded together forming a completely sealed integrated junction.

Heat – thermal energy expressed in Calories, Btu’s or Joules.

Heat Balance – proper sizing of the heat source to the requirements of the system (including heat losses).

Heat Exchangers – metal tubes or plastic coils designed to heat or cool solutions by immersion, with a fluid (or steam) circulating through the coil to obtain the desired effect.

Heat of Fusion – the amount of energy required to change one pound of a material from a solid to a liquid without an increase in temperature. Expressed in Btu/lb.

Heat of Vaporization – the amount of energy required to change one pound of a material from a liquid to a vapor without an increase in temperature. Expressed in Btu/lb.

Heat Offset – for some PID controllers; allows the creation of a dead area where neither heat nor cold is on, to prevent the process from oscillating between heat and cool. Saves energy.

Heat Sink – in power control, an array of plates or fi ns, usually alu minum, which conducts heat away from the power control devices (SCR’s) and dissipates the heat by free or forced convection.

Heat Tracing – heat applied to pipes or tanks, to replace heat lost through the insulation to the ambient.

Heat Transfer – a process of thermal energy flowing from one body to another. 1) Conduction: the transfer of heat from one particle of matter to another. 2) Convection: the transfer of heat from one part of a particle to another by the mixing of the warmer particles with the cooler. 3) Radiant: the transfer of heat from one body to another as the result of the bodies emitting and absorbing radiation energy.

Heat Transfer and Release Coating – a compound designed to be applied between heaters and the surfaces being heated to improve heat transfer. Also makes cartridge heaters easier to remove from drilled holes.

Heat Transfer Fluid Vaporizer – a vaporizer for heat transfer fl uids, to obtain improved process heat transfer by recovery of the heat of vaporization.

Heat Transfer Medium – a gas, liquid or solid through which heat flows from the heat source to the work.

Heat Transfer Systems – consist of circulation heater(s), pump, control panel and related items, ready to connect to your service and process. Oil and water systems are available, in many sizes with a host of features and accessories.

Helically Coiled Resistance Wire – a coil of Nichrome wire, wound in a helix, which is the resistance winding of the heater.

Hertz – units of expression for frequency, measured in cycles per second.

High Temperature Wire – special wire with high temperature insu lation and nickel or nickel plated copper conductor. Can withstand higher temperatures than plastic insulated copper conductor wire used for general connections. Do not use tin plated copper lugs on high temp wire. They will oxidize and fail. High temperature termina tions require special nickel or stainless steel lugs, if lugs are used.

Hi-Pot Test – the application of a high voltage to an electrical con ductor to test the surrounding insulation.

Hopper Heaters – modular heaters, consisting of tubular heating el ements mounted to a metal plate, for attachment to hoppers. These are used to keep the walls above a critical temperature to prevent contents from sticking to or attacking the hopper.

Humidity Transmitter an electronic device which provides a 4-20 mA signal based on the relative humidity sensed by the probe.

Hysteresis – the temperature sensitivity designed into the on/off control action between the on and off switching points. Expressed in percentage of control range. Also known as dead band.

Ice Point – the temperature where pure water freezes (0˚C or 32˚F).

Immersion Heaters – heating elements designed to heat a fluid or gas by direct contact.

Impedance – the total opposition in a circuit to the flow of alternat ing current. Measured in ohms and represented by “Z”.

Infrared – or radiation is the exchange of energy by electromagnetic waves. The infrared spectrum extends from the deep red end of the visible spectrum to the microwave region of the radio spectrum, The portion adjacent to the visible spectrum is of importance to heating. Radiant heat transfer can be very effi cient in directing energy from the heat source to an object.

Insulation, Electrical – a substance which surrounds an electrical conductor, to prevent current from flowing to or leaking to ground or to other conductors.

Insulation Resistance – is the resistance of an insulator to current flow from a conductor (typically a heating element winding) to ground (the sheath). Usually measured by the application of a volt age, and measuring the resulting current. The resultant resistance, which is expressed in ohms, is calculated by the formula: R= V / I.
Insulation, Thermal – a material which reduces heat flow from heated areas or objects to colder objects to conserve energy im prove performance, or prevent operator contact with hot objects.

Input Scaling – allows PID control to be adjusted to display inputs from transmitters (i.e. humidity), in appropriate engineering units.

Integral – (See Automatic Reset).

Intrinsic Safety Barriers – devices that limit current voltage and total energy delivered to a sensor or other instrument located in a hazardous area.

Intrinsically Safe Equipment and Wiring products that are not capable of releasing suffi cient energy in a circuit to ignite a flammable atmosphere in a hazardous area.

Isothermal – a process or area that maintains a constant temperature.

Joule – the basic unit of thermal energy. 1 Joule equals 1 ampere passed through a resistance of 1 ohm for 1 second.

Junction – A thermocouple junction is the point at which two alloys are joined. A typical thermocouple circuit would have a measuring and a reference junction.

Kelvin – the unit of absolute or thermodynamic temperature scale. Zero Kelvin is absolute zero, where all molecular activity stops. No ˚ symbol is used. 0˚C = 273.15K; 100˚C = 373.15K.

Kilo – the metric prefi x for one thousand (K).

Kilowatt (kw) – 1000 watts or 3412 Btu per hour.

Kilowatt Hour – electrical unit of energy expended by one kilowatt in one hour.

Lag – the time delay from application of heat until the process reaches temperature or the delay in a controller responding to a temperature change.

Least Significant Digit – The digit farthest to the right in a display.

Light Emitting Diode (LED) – a solid state device which produces light from the flow of electric current through a semiconductor. These are individual indicating lights or segmented readouts used to display temperature.

Linearity – the compliance of an instrument’s response to a straight line.

Liquid Level Control – detects liquid level below a reference depth. Can be used for replenishment or to turn off a heater to prevent damage.

Load – the electrical demand of a process expressed as wattage, amps or resistance (ohms).

Manual Reset – the adjustment on a proportional control which shifts the proportioning band in relation to the set point to eliminate droop or offset errors.

Mass Flow Rate – weight of a substance flowing per unit of time past a specifi c cross-sectional area within a system.

Maximum Allowable Load Resistance – the maximum resistance (in ohms) into which a control can deliver specifi ed current. Usually specifi ed for 4–20mA outputs, and is limited by internal control supply voltage.

Mean Temperature – the maximum and minimum temperature average of a process at equilibrium.

Measuring Junction – the thermocouple junction at the point of measurement in the process.

Mechanical Relay – an electromechanical device that completes or breaks a circuit by closing or opening electrical contacts.

Mega – the metric prefi x for one million (M)

Mercury Contactor (Mercury Displacement Relay) a mechani cal relay with mercury as the current carrying conductor. They are faster, quieter, and last longer than conventional mechanical contactors. Contains mercury, a hazardous substance, not permitted in some plants.

MI Cable (Mineral Insulated Cable) – refers to metal sheath heat trace cable, having internal magnesium oxide insulation between the conductor(s) and the sheath. Specially suited for high temperature operation, and is mechanically rugged. All MI cables are made to order.

Micro – The metric prefi x for one millionth Microamp (one millionth of an amp).

Micron – (one millionth of a meter).

Microprocessor – The central processing unit (CPU) that performs the logic operations in a micro-computer system. The microproces sor in a process or instrument control decodes instructions from the stored program, performs algorithmic and logic functions, and produces signals and commands.

Milli – The metric prefi x for one thousandth

Milliamp – (one thousandth of an amp).

Millivolt – (one thousandth of a volt)

Moisture Resistant Terminal Housing – a terminal housing de signed to meet the requirements of NEMA 4. Chromalox types E2 and E4 meet these requirements.

MOV Protection – SCR protection provided by a Metal Oxide Varis tor (MOV), which clamps voltages at limits to stay below critical SCR failure values.

NEC (National Electrical Code) – regulations and specifi cations for wiring as published by the National Fire Protection Association, Inc. NEMA – National Electrical Manufacturer’s Association Noise – undesirable electrical interference on the signal wires.

Noise Suppression – a device used to reduce electrical interference.

Normal Mode Rejection Ratio – the ability of an instrument to reject interference of the line frequency (50-60Hz) across the input terminals.

NPT – National Pipe Thread

OCE (Open Coil Element) – heaters designed to be installed in 2 or 3 inch customer- supplied threaded schedule 40 dry well pipes to heat liquids with the heat transferred through the pipe walls. Provides low watt density on the pipe for viscous fluids, and allows for heater replacement without draining the tank. Available terminal housings provide easy connections to heater with high temperature wire. Not for use in explosion hazard areas.

Offset – the difference in temperature between the set point and the actual process temperature.

OHM – the unit of electric resistance.

On-Off – a control whose action is full on or full off.

Open Coil Elements – elements with the Nichrome resistance wire exposed. Designed to heat by radiation and/or convection.

Open Coil Oven Elements – ribbon wound open coil elements designed specifi cally for use in ovens.

Open Loop Control – a control system with no sensing feedback.

Open Sensor Output Command – for some PID controls, allows selection of shut down or switch to pre-assigned power output (i.e. 30%), in the event of an open sensor.

Output Limit – for some PID controls, allows selection of a maxi mum percent of full power. Useful of heater is oversized, or for fast heat up followed by close control.

OSHA – US Government agency, Occupational Safety and Health Administration (or Agency). Specifi es and enforces safety in the workplace.

Over-the side Immersion Heaters – immersion heaters designed for use in open top tanks. A wide variety of sheath materials and coatings are available to heat most solutions Risers to terminal housings are provided, as well as optional mechanical thermostats for some models.

Overshoot – excursion of temperature above the set point.

Percentage Timing Input Controllers are motor driven adjustable duration cam devices. These provide an adjustable duty cycle, for a time base of 15 or 30 seconds. Useful for intensity (open loop) control. Not for use with tungsten quartz radiant heaters.

Phase – time based relationship between an intermittent function and a reference. Electrically, the expression is in angular degrees to describe the voltage or current relationship of two alternating waveforms.

Phase Angle Control SCR fi ring mode in which the SCR’s are turned on for a portion of each half cycle. Necessary for high inrush and/or inductive loads, such as tungsten (quartz lamp) heaters and transformers.

Phase Proportioning – a temperature control form where the power supplied to the process is controlled by limiting the phase angle of the line voltage.

PIDthree mode temperature control–proportional, integral (auto matic reset), derivative (rate).

Polarity – having two oppositely charged poles; one positive, one negative.

Potting – The sealing of components with a compound such as epoxy to protect against moisture and other contaminants.

Process Air Heaters – component heaters or complete assemblies for heating low pressure, high volume air for processes. Single elements of 475 watts to duct heaters of 300kw are included in the selection.

Process Alarm – a fi xed alarm or secondary set point value inde pendent of the primary set point. Should a process value exceed this value, an alarm condition would register.

Process Radiant Heaters – heaters providing a variety of wave lengths of radiant energy for heating processes, drying parts, freeze protection, etc. Many types and sizes are available.

Process Value – the indicated value of the parameter being mea sured/controlled.

Process Variable – the parameter being controlled or measured such as temperature, relative humidity, flow, level, pressure, etc.

Proportioning Band – (or proportional band) the temperature band in degrees within which a control’s proportioning function is active. The width is usually adjustable, and is expressed in degrees or as a percent of span.

Proportioning Control Mode – when process temperature ap proaches set point and enters the proportioning band, the output is switched on and off at the established cycle time. The change in power to the load provides a throttling action which results in less temperature overshoot. This cycling will continue until on and off times are equal.

Protection Head – a junction box for the protection of the sensor to extension wire connection. Protection heads can provide mechani cal, moisture, and explosion area protection.

psiapounds per square inch absolute. Pressure reference to a vacuum.

psigpound per square inch gauge. Pressure reference to ambient air pressure.

Quality of Steam – the relative amount of liquid present in saturated steam as a percent of the total weight. The quality of steam is 100% less the percent liquid. Dry saturated steam has a quality of 100%.

Quartz Lamp Radiant Heater – a heater in a reflector, using a tungsten fi lament quartz tube heater for the radiant source. The best source when the heater must be able to be turned off quickly when the line stops. Intensity control must use phase angle fi red SCR’s.

Ramp – a programmed rise in temperature.

Range – an area between two limits in which a measurement or control action takes place. Typically expressed in upper and lower limits.

Rankine – an absolute temperature scale based upon the Fahrenheit scale with 180˚ between the ice point and boiling point of water. 0˚F = 459.67˚R.

Rate (derivative) – a control function that measures the rate of in crease or decrease of the system temperature and brings the control into an accelerated proportioning action. This mode prevents an overshoot condition at initial heat-up and with system disturbances.

Rate Time – the interval over which the system temperature is sampled for the derivative function.

Remote Setpoint – on some controllers, an external 4-20 mA signal, or similar, will change the setpoint of a control. Good for remote computer system control or cascading.

Remote Shutdown – a feature on some SCR units, permitting the shutdown of output from a remote contact opening or closing.

Repeatability – the ability to give the same output or measurement under repeated identical conditions.

Repressed Bends – required when a tubular heater is bent to tighter radius than permitted for customer bending. Repress dies restore the internal compaction of the magnesium oxide to prevent voids, which may result in premature heater failure.

Resistance – the resistance to the flow of electric current measured in ohms.

Resolution Sensitivity – the amount of temperature change that must occur before the control will actuate. It may be expressed in temperature or as a percentage of the control’s scale.

Response Time – In analog instruments, the time required for a change of the measured quantity to change the indication. In sen sors, the time required to reach 63.2% of the step change.

Retransmit Output – analog output scaled to the process or the set point value.

Ring and Disc Heaters – component heaters which are flat and cir cular. They are usually used to heat by clamp on conduction. Variety of sizes offered allows for nesting.

RS232 or RS 422-485 Input/Output Signal – A serial interface suitable for connection between a digital control and a personal computer, a host computer or printer.

RTD – a temperature sensing probe of fi nely wound platinum wire that has a linear resistance change for a corresponding temperature change. The resistance increases as the temperature rises. A base resistance of 100 ohms at 32˚F is the industry (DIN) standard.

Saturation Temperature – the boiling temperature of a liquid at the existing pressure.

SCFM – Volumetric flow rate in cubic feet per minute at 60˚F (15˚C) and standard atmospheric pressure.

SCR – Silicon Controlled Rectifi er

Secondary Insulating Bushings – porcelain bushings designed to allow certain strip heaters to be electrically isolated from ground, when using on higher voltages for air heating. The heater tabs must be punched at the factory to accommodate the bushings.

Self-Regulating – refers to a type of heat trace cable, which has a decreased wattage output for increasing temperature.

Self-tune – an internal program in some PID controllers, which allows the control to experience the process and internally calculate parameters to obtain good process control operation.

Serial Interface – the hardware and wiring to connect control(s) with digital communications to a computer. Typical choices are RS232 (single drop), RS 422, 458 (multi-drop).

Sensor Breakdown Protection – circuitry which ensures safe pro cess shut down in the event of sensor failure.

Sensor Selection – a menu or hardware feature on most indicating controls which allows selection of a number of thermocouple types, RTD’s and /or other sensors

Serial Communications – A method of transmitting data between devices.

Set Point – control setting to achieve or maintain temperature.

Screw Plug Immersion Heaters – immersion heaters, which mount with a screw plug, typically with a standard NPT thread. Most have an available selection of terminal housings for various environ ments. Some also include built-in mechanical thermostats.

Shape Factor – in radiant applications, the amount of energy received by the target relative to heater rating and distance to the target.

Sheath – the outer shell of a heating element, usually metal. Typi cal materials are: copper, steel, stainless steel alloys, and others. Provides mechanical protection and a ground path.

Sheath Length – the length of the sheath measured without the ter minals or protruding terminal pins. Typically held within one percent for Chromalox tubular heaters.

Shield – material surrounding a conductor(s) to prevent interfer ence of electrostatic or EMI from external sources.

Shorted SCR Detection – circuitry in some SCR’s to detect a shorted SCR in a power control module. Usually the output can be an alarm to alert operator that unit needs service.

Shunt Trip – a coil, designed to turn off the main disconnect on a panel, when energized. Typically used for large SCR panels, to drop the load if high limit is reached.

Single End Tubular Heaters – tubular heaters with both electrical connections located at one end of heater. Simplifi es wiring.

Slide Wire Feedback – A potentiometer that varies resistance in response to a valve position. This provides valve position informa tion to the valve controller.

Soak – To raise the temperature of a metal object in a heated environment to produce a metallurgical change. Also, a pre-pro grammed time to provide a set point to a process, as used in a ramp-soak program.

Soft Metal Melting Pot – an open top vessel designed to melt solder, tin and/or lead.

Soft Start – reduces voltage on initial start-up which reduces power to the heaters.

Solid State Relay – a solid state switching device which completes or breaks a circuit electrically with no moving parts.

Span – the difference between the upper and lower limits of a controller’s range.

Specific Gravity – the ratio of mass of any material to the same volume of pure water at 4˚C.

Specific Heat – the ratio of thermal energy required to raise the temperature of a mass of material 1 degree to the thermal energy required to raise an equal mass of water 1 degree.

Speed of Response – time needed for a temperature change occur ring at the sensor to be translated into a control action.

Spring Loaded – refers to sensor probes designed for use in ther mowells. The probe has a spring, which forces the tip of the sensor to make good contact with the inside end of a properly chosen thermowell.

Stability – the ability of an instrument or sensor to maintain a con stant output when a constant input is applied.

Standard – reference point from which references or calibrations are made.

Steam Boilers – automatically provide a source of steam for pro cesses or other uses. Boilers are available in a wide variety of sizes and styles. Accessories include automatic blowdown, condensate return systems, steam separators and more

Strip Heatersheating elements with a rectangular cross section, usually used to heat objects by clamp on conduction or heating air by free or forced convection.

Super Heating – the heating of a liquid above its boiling tempera ture without changing to a gaseous state; or the heating of a gas considerably above the boiling temperature.

Surge Current – a higher than nominal current of short duration oc curring when power is initially applied to loads such as self regulat ing heat cable and tungsten fi lament quartz radiant heaters.

Temperature Gradient – the range of temperature variations at vari ous physical locations throughout a thermal system.

Tera – the prefi x for one trillion(T).

Terminal Pin – a pin in the end of tubular and similarly constructed heaters to which the resistance winding is attached. The pin extends out of the heater and is attached to a terminal to facilitate wiring.

Terminals – the means to attach wiring to heaters. For tubular heat ers, a wide variety are available to accommodate wires, lugs, or 1/4 inch push on connectors.

Thermal Conductivity – the property of a material to conduct heat.

Thermal Expansion – an increase in size due to an increase in temperature.

Thermal Lag – the time delay in the distribution of heat throughout a thermal system.

Thermal System – a series of components arranged and designed to provide heat. The four elements or components compromising a Thermal System are: 1) work or load 2) heat source 3) heat transfer medium 4) control system

Thermistor – a temperature sensing probe manufactured of a mixture of metal oxides then encapsulated in epoxy or glass. A large change in resistance is exhibited proportional to a change in tem perature. The resistance usually decreases as temperature rises.

Thermocouple – a temperature sensing probe consisting of the junction of two dissimilar metals which has a millivolt output pro portional to the difference in temperature between the “hot” junction and the lead wires (cold junction).

Thermowell – a closed-end tube into which a temperature sensor is inserted to isolate it from the environment.

Thin Blade Heaters – tubular type heaters having a 1 / 4/ by 1 inch cross section. Available in single or three phase models

Touch Safe Design – optional shields available on some SCR power control modules, reduce the possibility of personnel coming in contact with high voltage.

Transducer – a device that converts a measured variable into another form which is the transducer’s output. A thermocouple transforms heat to a millivolt output.

Transmitter – a device used to transmit temperature data from the sensor.

Tubular Element cylindrical component heating element made with a metal sheath, enclosing a magnesium oxide surrounded Nichrome resistance winding. Cross section may be round, heart shape or flat pressed.

Undershoot – excursion of temperature below set point.

Underwriters’ Laboratories (UL) – a third party approval agency for components and fi nished products.

Ungrounded Junction – A thermocouple junction fully insulated from the sheath.

User Selected Security Code – a feature on some PID controls, allows the selection of an unique code, if the default codes are compromised.

VDE – an independent, German third party testing organization for product safety. Viscosity – the inherent resistance of a substance to flow Voltage – an electrical potential, which is measured in volts.

Wattage – a unit of measurement of electrical power. In a resistive circuit, VI = W (See Ohms Law formulas).

Watt Density – the rated wattage of an element per unit of surface area. Usually expressed in watts per square inch.

Welded – one common method of attaching sensor probe to threaded hub. Welding produces a moisture proof, mechanically strong bond.

Zero Voltage (or Zero Crossover) Switching completing or break ing of a circuit when the voltage wave form crosses zero voltage.

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