STEMCO Capillary Switches are a division of Senasys and stand out from other capillary switch manufacturer’s because they are temperature compensated.
A capillary switch should be temperature compensated to adjust the switch’s performance when changes in temperature occur. For instance, a capillary switch may be set for the contacts to close at 150°F, but the fluid or air temperature within the equipment may reach 250°F. If the capillary switch wasn’t temperature compensated, the switch may have a poor reaction to the high temperature within the equipment and cause failure.
At Senasys, we expose the capillary tube to a higher temperature during our inspection process to ensure the diaphragm assembly will react as it should even if there is extreme environment changes. The majority of our current assemblies are ambient temperature compensated to 250°F. Other custom temperature compensation options are available. Click here to send us your requirements!
Capillary Series Max. Ambient Temperature
351 Series 250°F
352 Series 250°F
354 Series 150°F
355 Series 150°F
358 Series 250°F
No matter which style or model you choose, all of the thermostats with capillary tube operate using the same physics. A fluid is encapsulated in a metal and when the temperature changes the fluid either expands or contracts. This fluid change moves a diaphragm which is in touch with a snap action switch and either opens or closes a circuit. Our capillary thermostats also offer the option of being ambient compensated to offset the differential in temperature which keeps our thermostat controls more accurate as it’s environment changes.