Fenwal has been controlling temperature since the 1930's with their unique and extremely accurate Thermoswitch temperature controller. The Thermoswitch can sense and switch at .1 degree F. The Thermoswitch is a bi metal switch with the outer shell expanding and contracting which causes the contacts to make and break. The switch probes are made of brass or stainless steel. The Brass switches have a range of -100F to 400F while the Stainless switches have a range of -100F to 600F.
As of January 1, 2018 the brass switches have been discontinued and leave the Stainless steel switches as the only choices. The accuracy of the stainless steel is the same as the brass.
Here are the brass switches and their stainless counterparts.
Brass ...... Stainless Steel
17000-0 -- 17002-0
17021-0 -- 17023-0
17100-0 -- 17102-0
17121-0 -- 17123-0
17200-0 -- 17202-0
17221-0 -- 17223-0
17300-0 -- 17302-0
17321-0 -- 17323-0
18000-0 -- 18002-0
18021-0 -- 18023-0
17000-0 -- 17802-0
17821-0 -- 17823-0
Note: Switches that have the 21 or 23 in them (odd numbers) are switches that CLOSE on temperature rise.
The switches with 00 or 02 (even numbers) OPEN on temperature rise.
Buy Fenwal switches at Anderson-Bolds
Contact Anderson-Bolds
216-360-9800
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