Mechanical temperature switches have been developed to switch an electrical contact, when a temperature in a process exceeds defined limits. The temperature can be too high or too low. Temperature switches have no precise local indication, no analog output signal and need no electrical power supply. These simple devices are purely optimized to guarantee an excellent repeatability and reliability of the switching behavior.
Temperature switches without power supply are used in safety critical applications. Bourdon is a well- known supplier for the equipment of power plants and offers a wide range of products especially for nuclear power stations.
But also many other applications like monitoring or regulation of fluid temperatures in a tank, heat exchangers etc. profit from these safe and simple solution.
Temperature switches are available in EEx ia and EEx d versions for hazardous areas. With remote capillaries up to 20 meters length installation is possible also under difficult mounting conditions.
The Bourdon - Baumer Group range of temperature switches offers reliability and proven resistance to harsh environments and processes.
Bourdon temperature switches can be custom made to match your application requirements.
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Mechanical Bourdon temperature switches are designed for alarm setting, if temperature limits are exceeded or temperature regulation between 2 setpoints.
The sensing element of a temperature switch is a closed, vapor filled system. The pressure in this system depends on the measured temperature. This pressure is applied to a membrane, which actuates a mechanical microswitch by means of a lever.
The value of the setpoint is defined by the adjustment of a compressible spring working in the opposite direction than the membrane. The setpoint can be adjusted in the factory or by the customer. For several microswitch types, the deadband is also adjustable. This allows separate definition of setpoint and reset point.
Bourdon temperature switches provide an excellent repeatability in a compact design. The working principle is fully mechanical and requires no electrical power supply. Wiring has to be done only to read the microswitches.