Series 17800 – Junction Box Immersion Style
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The Fenwal Thermoswitch Temperature Controller is a 5/8″ diameter cartridge-style mechanical thermostat with an adjustable temperature set point. The Series 17800 has electric conduit junction box containing terminal block and temperature adjustment dial & knob. Also external 1/2″ NPT pipe thread fitting. 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:
Download Fenwal Thermoswitch Datasheet (pdf 700K)
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