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The  Telethermostat is an electromechanical temperature controller with indication. The devices are in a liquid-filled measuring system, which consist of the temperature probe, capillary, Bourdon tube and a micro-switch. The temperature-dependent change in volume in the measuring system is converted by the Bourdon tube in a rotational movement of actual pointer without a transmission gearing. By the rotation of the pointer shaft,  the microswitch is activated by a pick-off system.