STEMCO Capillary Switch

Capillary Switch Controls Deep Fryer’s Heat Elements

In a deep fryer a single or double capillary type thermostat may be used. The bulb portion of the capillary is made of Stainless steel, or a plated copper, and is immersed directly into the fluid being heated. One capillary may be used as a control switch turning the heating elements on and off at pre-set or adjustable temperature.

Contact us about SPDT capillary thermostats

Many fryers use a second capillary switch as a limit to prevent the heating elements from a runaway condition causing the heated medium to overheat and burn. The capillary type thermostat can be a simple probe type with the diaphragm connected directly to the switch. Or it can be a bulb and capillary type so the contacts portion can be located a distance away from the immersed bulb. Click on the diagram below for more information.

Capillary Type Thermostat is a Control & Limit

Manual or Automatic Reset Capillary Switches

Capillary switches can be a manual reset requiring human intervention, or automatic. The better quality capillary type thermostats, such as ours, can be ambient temperature compensated. The less expensive ones are not. 

For more information on our bulb and capillary switches, click here to visit the product page.

If you have a similar unit that needs a temperature control, click here to contact our inside sales team.

4 thoughts on “Capillary Switch Controls Deep Fryer’s Heat Elements

  1. Ghany Zayoud


    we are looking for 12 v dc adjustable bimetal thermostats that operate at high temperatures up to 400 degrees C. Kindly advise what models you have available.

    Looking forward for your feedback.

    With Regards,

    1. Senasys


      I am sorry to say but we do not have a bi-metal thermostat that can reach that high of a temperature. We do have a capillary action thermostat which could reach 400 degrees C with ease. If you are interested in more information please send an email to INFO@SENASYS.COM.

      Thank you,

      The Senasys Team

  2. Jim Yun

    Would like to know if you have IECEx T6 temperature switches for air or surface . 0 to 100C temperature . CUt off point at 90C . Looking for size that is about 3inches w x L ..

  3. Jerry Betchan

    I am looking for a 400 degrees C capillary action thermostat.
    I need an auto reset, adjustable, closes on temperature rise.

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