stemco
Bulb and Capillary Thermostats
Original Equipment Manufacturers worldwide rely on STEMCO, a division of Senasys, for high-quality thermostat switches. Regardless of style or model, all our bulb & capillary thermostats work using the same basic principle: a fluid inside a metal capsule expands or contracts as temperatures change. This fluid movement drives a diaphragm, which triggers a snap-action switch, opening or closing the circuit.
Senasys thermostats are trusted by commercial food equipment manufacturers for their UL-approved switches that ensure reliable temperature control. We also supply critical thermostat solutions for applications in pool & spa systems, HVAC equipment, & home products.
quality ambient compensation
Our capillary thermostats feature ambient compensation to offset temperature differentials, ensuring greater accuracy as environmental conditions change. This technology helps maintain reliable temperature control, even in fluctuating surroundings, making our thermostat controls ideal for dynamic applications.
certified
Senasys ensures the quality control & reliable operation of all our products. Every capillary thermostat is 100% tested individually before leaving our facility to guarantee consistent performance. Our capillary thermostats are UL & cUL approved, meeting industry standards for safety & reliability.
custom options
Senasys capillary thermostat switches are available as custom-built temperature control solutions, tailored to meet your exact specifications. This ensures you receive the precise capillary thermostat switch you need, without paying for unnecessary features, optimizing both performance & cost.
MADE IN THE U.s.a.
All Senasys products are designed, manufactured, tested, & shipped from our facilities in Eau Claire, WI to clients worldwide. Every switch is individually 100% tested for quality & performance before leaving our plant, ensuring reliable operation for every customer.
Join us! It will only take a minute
Single Stage Bulb & Capillary Thermostats
Senasys offers a variety of single pole, double throw (SPDT) capillary thermostats, available in both field adjustable & fixed models. These thermostats can be equipped with either manual or automatic reset options, providing flexible solutions for diverse applications.
Two Stage Bulb & Capillary Thermostats
Senasys also offers an option for a second switch (DPDT), providing flexibility in control. The two switches can be configured in any combination of SPDT auto reset & SPST manual reset, allowing for customized temperature control solutions.
HYDRASTAT Capillary Tube Temperature Sensors
The Capillary Tube Temperature Sensors consist of a bulb, capillary tube, and a diaphragm. The diaphragm is engineered to move at a specific rate in response to temperature changes, providing precise temperature sensing and control.
Electronic Temperature Switch
The electronic temperature switch offers a cost-effective, flexible solution that provides tight differentials & tolerances. This digital switch can be used as a standalone board mounted to the control panel or as a complete enclosure, offering versatility for various applications.