The DE90 is a differential pressure transmitter with additional switch outputs. It is suitable for measuring overpressure, under-pressure and differential pressure in neutral gaseous media. The unit can be used in safety-related systems. The device does not have ATEX approval. It may only be used there as an industrial device. The device is based on a piezo-resistive sensor element that is suitable for measuring overpressure, under-pressure and differential pressure. The pressures to be compared directly act on a silicon diaphragm equipped with a measuring bridge. When the pressure is equal, the measuring membrane is in rest position. If a pressure difference occurs, the membrane is deflected, causing a change in resistance of the applied measuring bridge. This change is evaluated by the electronics integrated in the instrument and converted into display and up to four switching contacts. The device can optionally be equipped with up to two analog outputs. The output signal can be attenuated, spread, inverted and also non-linearly transformed via a table function.
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