STEMCO

Hydrastat Capillary Tube Temperature Sensors

368 Hydrastat Capillary Tube Temperature Sensors, used in all 350 series remote sensing thermostats, are available as standalone components for OEM equipment. These sensors detect temperature changes using a liquid-filled bulb, capillary tube, and diaphragm, providing precise mechanical signals for custom temperature control in HVAC, industrial, food equipment, and more.

They are offered with a range of customizable options, including temperature ranges, material choices, and configurations, ensuring they meet specific design and operational requirements.

Material Options

Our Capillary Tube Temperature Sensors are available in multiple material options including copper, nickel plated copper, one piece stainless steel or two piece stainless steel. 

certified

Senasys takes pride in quality control and reliable operation of our products. Every switch is individually 100% tested before it leaves the plant. Our capillary thermostats are UL & cUL approved.

CUSTOM OPTIONS

Hydrastat Capillary Tube Temperatures Sensors built by Senasys can also be built to customer specifications. This ensures you get the exact control you want without paying for features you don’t need

MADE IN U.S.A.

Products are designed, manufactured, tested and shipped from Senasys’ facilities in Eau Claire, WI to clients across the globe. 

The 368 Hydrastat is available for sensing temperatures from 0°-700°F. The cup size of the diaphragm will determine the maximum amount of movement over the specified temperature range. The relationship between the required bulb dimensions and the desired temperature range must be considered in specifying the appropriate Hydrastat. Only the length or diameter of the bulb can be a fixed specification. One of these dimensions must remain open because it will vary according to the movement necessary at the operating temperature.

  • 0°F – 700°F Temperature Range
  • 0.028″-0.045″ Max Travel
  • Capillary Diameter 0.059″ or 0.078″
  • Cup Sizes: 5/8″, 3/4″, 1″
  • Copper, Nickel Plated Copper or Stainless Steel Available

Available Options

We have three different capillary cup assembly options available. For other custom options, please contact us.

Cup Diameter

Maximum Travel
Maximum External Load

5/8″

0.028″
6#

3/4″

0.045″
20#

1″

0.041″
15#

Common Applications

Hydrastat Capillary Tube Temperature Sensors are commonly used in industrial, HVAC, and food equipment applications to control and limit heating element temperatures.

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    Capillary

    Bulb Details

    Cup Details

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    Adjustable Temperature Models


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