Temperature switches are used in instrumentation to generate a signal when a particular temperature has been reached. The switch closes or opens giving a signal. This signal can be used to stop an equipment in case of high temperature protection or start a compressor in a refrigeration system.
googleusercontent.com/-GEfClLjNFlM/VXG5rM-PcdI/AAAAAAAAI_M/Z-s5gde317E/Temperature%252520switch%252520with%252520thermowell_thumb%25255B2%25255D.jpg?imgmax=800" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; float: right; padding-top: 0px; padding-left: 0px; border-left: 0px; display: inline; padding-right: 0px" title="Temperature switch with thermowell" width="194">
Temperature switches operate in a variety of ways from simple bimetallic strips to thermistor driven electronic switches. In some switches, wax pellets which expand at high temperature can be used.
The output of a temperature switch can be configured to be either normally closed (NC) or normally open (NO).
Temperature Switches need to be periodically calibrated in a Temperature bath to ensure set point accuracy.