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The Capillary temperature sensor consists of probe, capillary tube, diaphragms and expansion medium. When the sensor is heated, the liquid medium heats up and expands. The expansion of the medium increases in the closed-circuit system. The pressure increase is converted into displacement in the diaphragm. This displacement, also called travel, actuates a snap-action switch, which opens or closes the contacts in the electric circuit. The reference variable is set via the thermostat’s adjusting spindle.
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