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Fenwal Thermoswitch Controllers
Series 18000 - Coupling Head
The Fenwal Thermoswitch Temperature Controller is a 5/8" diameter cartridge-style mechanical thermostat with an adjustable temperature set point. The Series 18000 has a coupling fitting with standard 1/2" NPT (3/4" NPT on 18052) male pipe threads at each end either of which may be used for mounting. The 48000 Series are .625 diam. thermoswitches that are UL recognized.
Corrosion Resistant (Series 18000) - Certain models are designed to be corrosion resistant. Type 316 Stainless Steel is used throughout for corrosion resistance.
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

Download Fenwal Thermoswitch Datasheet (pdf 700K)

Part No. Description Diameter Temp. Range Contact
on Temp Rise
Price Order Quantity
01-018000-000 Fenwal Coupling Head Thermoswitch 5/8" -100 to 400ºF Opens Brass $223.00   Enter qty:  
01-018021-000 Fenwal Coupling Head Thermoswitch 5/8" -100 to 400ºF Closes Brass $223.00   Enter qty:  
01-018002-000 Fenwal Coupling Head Thermoswitch 5/8" -100 to 600ºF Opens 300SS $257.00   Enter qty:  
01-018023-000 Fenwal Coupling Head Thermoswitch 5/8" -100 to 600ºF Closes 300SS $257.00   Enter qty:  
01-018052-000 Fenwal Coupling Head Thermoswitch 13/16" -100 to 600ºF Opens 300SS $342.00   Enter qty:  
01-048002-000 Fenwal Coupling Head Thermoswitch
U/L Recognized
5/8" -100 to 600ºF Opens 300SS $285.00   Enter qty:  
01-180020-029 Fenwal Coupling Head Thermoswitch
Corrosion Resistant
5/8" -100 to 500ºF Opens 316SS $336.00   Enter qty:  
01-018002-021 Fenwal Coupling Head Thermoswitch
Corrosion Resistant
5/8" -100 to 600ºF Opens 316SS $312.00   Enter qty:  
01-018023-007 Fenwal Coupling Head Thermoswitch
Corrosion Resistant
5/8" -100 to 600ºF Closes 316SS $312.00   Enter qty:  
Some items in stock. Out-of-stock items take 1-3 weeks. Please call for availability.
This page last modified on 12/29/2016
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