The differential pressure transmitter DE49 allows the measurement of under-pressure, over-pressure and differential pressure in dry neutral and gaseous media. Fields of application include air-conditioning technology, ventilation technology, environmental technology. The DE49 is suitable as an electrical device for operation in potentially explosive areas (painting systems, pharmacy, chemicals). This switching device is based on a piezo-resistive sensor element that is suitable for measuring overpressure, underpressure and differential pressure. The pressure acts on the silicone membrane of a semiconductor chip which in turn deforms. The specific material resistance changes proportionally to the deformation. The electronics inside the pressure transmitter casing now convert this resistance change into an electrical output signal, calculate the pressure measurement and display this on the LC display. The optional output signal can be dampened, spread and inverted.
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