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Fenwal Thermoswitch Controllers
The Fenwal Thermoswitch Temperature Controller is a 5/8" diameter cartridge-style mechanical thermostat with an adjustable temperature set point. Lightweight and compact, these units are economical temperature controllers or stand-alone high or low limit controllers. The Thermoswitch controllers control temperatures as low as -100ºF and as high as 1100ºF with the proven dependability of over 60 years of service to satisfied customers.
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 / 260ºC
  • 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
Fenwal Thermoswitch Temperature Controllers

Description
 Model # Watlow
Discontinued
Part #		 Temp. Range Contact
 Operation
on Temp Rise		 Shell
Mat'l		 Price
Cartridge (Series 17000) The base of all Thermoswitch controllers. This unit can be inserted into a .625 in. reamed hole. 01-017000-000 -- -100 to 400ºF Opens Brass $114.00
01-017021-000 -- -100 to 400ºF Closes Brass $114.00
01-017002-000 TSOLB01A -100 to 600ºF Opens 300SS $140.00
01-017023-000 TSKLB01A -100 to 600ºF Closes 300SS $140.00
Hex Head (Series 17100) Has all the features of the Cartridge type above plus the addition of a standard 1/2" NPT pipe thread for mounting purposes. 01-017100-000 -- -100 to 400ºF Opens Brass $148.00
01-017121-000 -- -100 to 400ºF Closes Brass $148.00
01-017102-000 TSOLH01A -100 to 600ºF Opens 300SS $173.00
01-017123-000 TSKLH01A -100 to 600ºF Closes 300SS $173.00
Block Head (Series 17200) This unit has the same mounting characteristics as the Cartridge Type but is designed so modifications may be included. 01-017200-000 -- -100 to 400ºF Opens Brass $128.00
01-017221-000 -- -100 to 400ºF Closes Brass $128.00
01-017202-000 TSOLR01A -100 to 600ºF Opens 300SS $153.00
01-017223-000 TSKLR01A -100 to 600ºF Closes 300SS $153.00
Flange Head (Series 17300) Has all the features of the Block Head Type and also a 3-hole mounting flange. 01-017300-000 -- -100 to 400ºF Opens Brass $142.00
01-017321-000 -- -100 to 400ºF Closes Brass $142.00
01-017302-000 TSOLF01A -100 to 600ºF Opens 300SS $164.00
01-017323-000 TSKLF01A -100 to 600ºF Closes 300SS $164.00
Junction Box Immersion (Series 17800) Has electric conduit junction box containing terminal block and temperature adjustment dial & knob. Also external 1/2" NPT pipe thread fitting. 01-017800-000 -- -100 to 400ºF Opens Brass $227.00
01-017821-000 -- -100 to 400ºF Closes Brass $227.00
01-017802-000 -- -100 to 600ºF Opens 300SS $251.00
01-017823-000 -- -100 to 600ºF Closes 300SS $251.00
Coupling Head (Series 18000) Has a coupling fitting with standard 1/2" NPT male pipe threads at each end either of which may be used for mounting. 01-018000-000 -- -100 to 400ºF Opens Brass $155.00
01-018021-000 -- -100 to 400ºF Closes Brass $155.00
01-018002-000 TSOLC01A -100 to 600ºF Opens 300SS $179.00
01-018023-000 TSKLC01A -100 to 600ºF Closes 300SS $179.00
Corrosion Resistant (Series 18000) Has a coupling fitting with standard 1/2" NPT male pipe threads at each end. Type 316 Stainless Steel is used throughout for corrosion resistance. 01-180020-029 -- -100 to 500ºF Opens 316SS $200.00
01-018002-021 TSOLC03A -100 to 600ºF Opens 316SS $203.00
01-018023-007 TSKLC02A -100 to 600ºF Closes 316SS $204.00






Optional
Protective
Thermowells
 Hex Head Well 34-011201-000 3/4 NPT fitting for use with Series 17000 Thermoswitch, 321SS
 $160.00
Coupling Head Well 34-011204-000 3/4 NPT dual fitting for use with Series 17000 Thermoswitch, 321SS $234.00
Aluminum Surface Mounting Well 34-011100-002 With 4 holes for mounting on a flat surface. Use with Series 17000 Thermoswitch. $128.00
Low Pressure Hex Head Well 34-011208-000 3/4 NPT fitting for use with Series 17200 & 17300 Thermoswitch, 321SS
 $161.00

This page last modified on 1/2/2008