Capillary Diaphragm Assemblies

Stemco, a division of Senasys, has released the 368 Series Hydrastat Capillary Diaphragm Assemblies, built for tough temperature control in HVAC systems, food equipment, and industrial machinery. These assemblies deliver durability and customizable options for diverse applications.

For more details or to request a quote, visit the product page or contact us.

Flexible and Reliable Temperature Management: Hydrastat Capillary Diaphragm Assemblies

The 368 Series assemblies respond quickly to temperature changes, ensuring consistent system performance.

  • Wide Temperature Range: Calibrate from -20°F to 700°F, with operation from -40°F to 700°F. They handle extreme conditions in industrial ovens, refrigeration, and heating systems.
  • Custom Options: Choose from capillary tube diameters of 0.059” or 0.078” and lengths from 4 inches to 12 feet. Bulb-only probes are also available for specific setups.
  • Standalone Components: The liquid-filled bulb, capillary tube, and diaphragm sense temperature changes and relay mechanical signals to control systems. They easily integrate into custom designs or work as replacements.
  • Capillary Diaphragm AssembliesCup Size Options: Choose from three capillary cup assembly options. The 5/8” cup diameter offers a maximum travel of 0.028” and a max external load of 6#. The 3/4” cup diameter provides a maximum travel of 0.045” and a max external load of 20#. The 1” cup diameter has a maximum travel of 0.041” and a max external load of 15#
  • Durable Materials: Options include copper, nickel-plated copper, or stainless steel to resist corrosion in harsh environments.

Broad Industry Applications

The 368 Series assemblies are the standard sensors in all our 350 Series bulb and capillary thermostats and are also sold as standalone units. They simplify design and integration for manufacturers and are essential for reliable temperature control in commercial HVAC, food equipment, and industrial machinery. These assemblies consist of a liquid-filled bulb, capillary tube, and diaphragm, which sense temperature changes and transmit mechanical signals to control systems. Manufacturers use these components to integrate into custom control designs.

About Stemco, a Division of Senasys

Stemco, part of Senasys and based in Eau Claire, Wisconsin, manufactures durable temperature control products, including bulb and capillary switches, diaphragm assemblies, and thermowells. These products are used in food equipment, HVAC, industrial, and pool and spa applications, providing reliable performance in demanding environments. Designed for precision and longevity, Stemco’s products are rigorously tested for quality, ensuring accurate control across a variety of industries.

Contact our technical support today!

Senasys

The superior controls manufactured by Senasys have a history of solid performance in many industries. From 22.5 mm selectors, to the four quadrant lighted feedback CMC controls, almost any switching need can be, and has been utilized in a variety of applications. Select a group below for more information. When you have found a switch that fits your needs, simply fax or email your specs to us and let our highly trained engineers find the most efficient configuration for your applications.

Custom Soltutions

Senasys products are designed & manufactured to meet the needs of original equipment manufacturers worldwide.

Made in U.S.A.

Senasys products are designed & manufactured in Eau Claire, Wisconsin, U.S.A.