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        • PROFILE OF OUR COMPANY

        • Learn more about the profile of our company on how we contribute in the different areas of the industry.

        • HEADQUARTERS AND BRANCHES

        • Comind has 5 branches throughout Chile and distributors throughout the world. Here you will find their addresses and emails

        • Where to buy

        • Find the numbers and emails to contact your nearest branch

        • About us

        • Present throughout Latin America, Comind Industries has a complete line of products. Learn about our history from the foundation to the present

    • Inmersion Heaters
          • Flange Heaters

          • Screw plug Heaters

          • Circulation Heaters

            In Line Tubular Heaters
          • Portable Heaters

          • Standard Heaters

            Tubular immersion heaters
    • Heat Trace
          • Heat Trace Cables

          • Thermostats and Accesories

          • Mounting Accessories

          • CONTROL AND MONITORING

          • THERMAL INSULATION

    • Process Air Heaters
          • Duct Heaters

          • Tubular Duct Heaters

          • Evaporating Heaters

          • HEATERS (DRUM AND IBC)

          • Infrared heaters

    • Weld Heat Treatment
          • STRAIN RELIEF EQUIPMENT AND ACCESSORIES

          • INDUSTRIAL FURNACES

    • Industrial Confort
          • Industrial Thermos

          • truinus Line Thermos

          • Boot Dryvers

          • INDUSTRIAL CONVECTORS

          • Air Heaters

          • RADIANT SCREENS

    • Saled and Plastic
          • Cartidge heaters

          • BAND OR COLLAR HEATER

          • FLAT HEATERS

          • Microtubulars

          • Nozzle Heaters

          • Occluded heaters

    • Dust Collector
          • SLEEVE TYPE PICKUP

          • CARTRIDGE TYPE SENSOR

          • Dust Suppression

          • AHB WORKSTATION

          • PORTABLE SMOKE EXTRACTION

    • Gas Treatment
          • GAS SCRUBBERS

    • Air Conditioning
          • Air Handing Units

          • REFRIGERATION (HVAC)

          • VENTILATION TOWERS

    • Filters
          • CARTRIDGE FILTERS

          • SPARE PARTS AND ACCESSORIES

        • HEAD TYPE SENSOR

        • CARTRIDGE TYPE SENSOR

        • EYE BOLT TYPE SENSOR

        • SPIKE SENSOR

        • THERMOWELL AND PROTECTION TUBES

        • COMPENSATED CABLES AND ACCESSORIES

    • Process Controls
          • TEMPERATURE CONTROLS

          • CAPILLARY THERMOSTATS

          • TIMERS AND COUNTERS

          • INDICATORS

          • PLC AND HMI

          • CIP ACCESSORIES

    • Power
          • SOLID STATE RELAYS

          • LOAD RESISTANCE

          • REGULATING THYRISTORS (TPR)

          • HEATSINKS

    • Level
          • LEVEL CONTROL

    • Data Acquisition
          • MONITORING AND REGISTRATION

          • Data Logger

          • Registrators

          • WIRELESS

          • I/O Model

    • Sensors And Transmitters
          • TEMPERATURE

          • HUMIDITY AND TEMPERATURE

          • PRESSURE

    • Refrigeration
          • DIGITAL THERMOSTATS

        • Blog and Case Studies

        • Technology

        • Catalogs

        • TECHNICAL RESOURCES

        • SATISFACTION SURVEY

        • DO YOU WANT TO BE A DISTRIBUTOR?

        • CONTACT FORM

        • PHONES AND MAIL

Capillary Thermostats

Capillary and bulb style thermostats use expansive liquid to open or close contacts in response to changes in temperature. No matter which style or model you choose, all capillary thermostats work with the same physics. A fluid is encapsulated in a metal tube (bulb and capillary) and when the temperature changes, the fluid expands or contracts. This fluid change moves the head, which triggers a snap-action switch, either opening or closing the circuit.

The bulb is typically a larger diameter tube mounted in the material stream being sampled. The capillary is a small tube that carries the liquid away from the bulb towards the head. The head can be a diaphragm or bellow, which moves with changes in temperature.