Principle of Operation:
The Fenwal Thermoswitch controller is a strut-and-tube type thermostat comprised of two basic parts: the outer shell, made of high-expanding metal and the strut assembly made of low-expanding metal. A pair of electrical contacts is mounted on the strut assembly and installed in the shell under tension. The temperature at which the contacts “make” or “break” can be regulated by a temperature adjusting sleeve.
Fast Response:
Because the outer shell of the Thermoswitch controller is the active sensing member, and not merely a housing, response to temperature change is almost instantaneous.
Close Control:
The controller’s shell and strut arrangement has “anticipation” characteristics which substantially reduce the amount of overshoot and undershoot during conditions of rapid temperature change.
Extreme Sensitivity:
The strut and contact assembly operates by slow make and break. This means that every temperature change, no matter how small, causes a corresponding change in the space between the electrical contacts. Therefore, contact action can be produced by a very small temperature change, which accounts for the Thermoswitch controller’s excellent resolution os 0.1ºF (0.05ºC).
Agency Approval:
Various models are listed to component recognized by Underwriters Laboratories (UL) and certified by the Canadian Standards Association (CSA).
Specifications & Options:
- Shell dimensions: 5/8″ diameter, 3-9/16″ long (3″ long on units with threads)
- Standard lead wire: 8-10 inches
- Maximum volts: 240VAC / Vdc consult factory
- Maximum watts: 1200 AC / Vdc consult factory
- Maximum operating temperature: 600ºF / 316ºC
- Minimum operating temperature: -100ºF / -73ºC
- Contact action: slow make and break
- Options (call for pricing and applicability to specific models):
- Special Marking
- Extended Lead Wires
- Factory Temperature Setting
- Temperature Restraining Device
- Tamper-Proof Cap
- Dial and Knob
- Moisture Resistant Seal & Moisture Resistant Tamper Proof Cap
- Armored Cable (over lead wires)
- Terminal Plug Connector
- Extended Temperature Adjusting Sleeve
- Protective Wells
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01-017302-000 | 01-017323-000 | 17302-0 | 17323-0
