Adjustable temperature bulb and capillary thermostats have a liquid fluid fill encapsulated which expand the diaphragm actuating the snap action switch. Direct from USA Manufacturer. Custom options available.

No matter which style or model you choose, all of the adjustable temperature bulb and capillary 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.