When you have an application that uses a chiller such as a refrigeration unit or an air conditioner you may experience frost build up if the equipment is over worked. Most units will use a capillary temperature sensor to sense the frost. The temperature sensor is mounted externally and when the bulb of the capillary is cooled the contacts open shutting down the compressor. Once the frost or cooled condition has dissipated the equipment will return to normal operation.
These pieces of equipment may also use a second capillary calibrated at a temperature to prevent the chiller or compressor from coming on even when called for from a thermostat control. An example would be an air conditioner operating at an outdoor temperature below 50°F.
The better quality capillary sensors, such as ours, can be ambient temperature compensated.
Senasys offers a wide range of single pole, double throw capillary thermostats. Available field adjustable or fixed, the capillary thermostats can be manually or automatically reset. These high limit switches are highly versatile, carrying up to 30 amps. The capillary thermostat has a temperature range of 0°F-700°F, with a maximum ambient temperature up to 250°F.
For more information about our capillary thermostats, click here to visit the product page.
If you have a refrigeration temperature control application, click here to send a request for quote.