f.a.q.
You have questions. wE have answers.
A capillary switch is the actual device that opens and closes the circuit. It can be fixed or adjustable. They come in multiple mounting and control styles. Some are hidden away and some are panel mounted with knobs or slotted adjusting stems. Typically mounted away from the bulb in high heat or cold sensing environments or can be right on the bulb.
When a thermostat switch changes states, from Open to Closed for example, the point at which it resets to Open, or the original state, will not be exactly at the original point. The difference between those two points is the hysteresis.
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Likely both! When a machine needs higher reliability to operate, or cannot survive a digital control failure or power interruption, engineers will use something a more reliable such as a capillary or snap disc thermostat switch.
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Click here to find a simple capillary cross reference guide to help find the correct switch.
Bulb and Capillary style thermostats use expanding liquid to open or close contacts in response to temperature changes. No matter which style or model you choose, all of the capillary thermostats operate using the same physics. A fluid is encapsulated in a metal tube (bulb and capillary) and when the temperature changes the fluid either expands or contracts. This fluid change moves the head which triggers a snap action switch either opening or closing the circuit.
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A single pole switch has the ability to control one circuit. Double throw states that the switch has changeover contacts meaning that when one circuit closes, the second circuit is simultaneously open.
A double pole switch has the ability to control one two circuits. Double throw states that the switch has changeover contacts meaning that when one circuit closes, the second circuit is simultaneously open on each of the two switches.
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Our bulb & capillary thermostats are 100% tested before they leave our facility, and they are ambient compensated.
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Bulb & capillary thermostats have a lot of different options available to meet your application requirements.
Click here to find a step by step guide that outlines the detail to determine the best thermostat for your application.
Our capillary thermostats are designed & manufactured at our facilities in Eau Claire, Wisconsin, U.S.A.
Because our capillary thermostats are each design to meet customer specifications, typically they are made to order with a 6-8 week lead time. We do stock some standard production models for prototype testing. Contact us for further information.
Our office hours are:
Monday – Friday
8 a.m. to 4 p.m. CST
stemco cAPILLARY SWITCHES
A Division of Senasys
1435 International Drive
Eau Claire, WI 54701, U.S.A.
+1 (715) 831-6353
info@senasys.com