EU RO Mutual Recognition Group

General description of the product

Dual Temperature and Pressure Switches (hereinafter switches) have both temperature and pressure measurement capabilities with relevant output change-over and combined within the same device. Switches may have electric and/or electronic parts and be externally power supplied.

Temperature sensors may be based on several working principles: bi-metallic (BM), liquid expansion (LE), gas-expansion (GE), thermo-resistors (RTD), thermocouples (TC), infrared (IR), etc.; the relevant features of which vary accordingly. According their working principle the movement directly act on the opening and closing of an electrical switch or the sensor respond to temperature by changing the electrical performance.

Pressure sensors of different types of sensing elements can be used but they have one thing in common: they move in response to changes in the system pressure. Through their movement, they directly act on the opening and closing of an electrical switch (without requiring any power supply).

Electronic/solid state pressure sensors use the same technology found in analogue pressure transmitters to sense changes in pressure rather than harnessing the energy of the pressure changes to mechanically operate a switch (as with electromechanical pressure switches).