Abstract: The invention relates to a device and a method for the status monitoring of a pressure measuring unit in an absolute or differential or relative pressure transducer, a pressure-sensitive element installed in the pressure measuring unit being impinged with at least one pressure generated by at least one membrane. During a defined diagnosis time interval, a testing element integrated in the pressure measuring unit is induced to undergo a change in volume, preferably by electrical activation. The pressure difference caused as a result in the pressure measuring unit is registered by a pressure-sensitive element. The curve registered during a diagnosis time interval is compared with a reference curve recorded with the pressure measuring unit intact. A fault indication is given if the deviations between the registered curve and the reference curve exceed predetermined tolerance values.

Abstract: The invention relates to a device and a method for the status monitoring of a pressure measuring unit in an absolute or differential or relative pressure transducer, a pressure-sensitive element installed in the pressure measuring unit being impinged with at least one pressure by means of at least one membrane. During a defined diagnosis time interval, a testing element integrated in the pressure measuring unit is induced to undergo a change in volume, preferably by electrical activation. The pressure difference caused as a result in the pressure measuring unit is registered by a pressure-sensitive element. The curve registered during a diagnosis time interval is compared with a reference curve recorded with the pressure measuring unit intact. A fault indication is given if the deviations between the registered curve and the reference curve exceed predetermined tolerance values.

Abstract: A differential pressure transducer unit with an overload protection system to measure slight differential pressure in liquids and gases under high static compression loading, which unit can be connected by flanges to the differential-pressure lines. In order to reduce the number of pressure-tight electrical bushings and largely to dispense with continuously stressed flexible connection lines, the one or more sensors contained in the measuring element are constructed on a single, multi-pole electrical bushing, which form an integral unit with the latter. The measuring element constructed on the bushing is housed in a cutout of the measuring-element housing so that it can oscillate and is free from tension. The cutout is closed by the bushing in the manner of a plug.

Abstract: A differential pressure transducer unit with an overload protection system to measure slight differential pressure in liquids and gases under high static compression loading, which unit can be connected by flanges to the differential-pressure lines. To avoid disturbing influences on the measuring element caused by radial tensions of the means of the overload protection system dependent on the absolute pressure, the measuring element is fasten in a cutout of the measuring-element housing so that it can oscillate and is free from tension. Each insulation plate is fitted with an eccentrically located measuring duct through which pressure-measuring agent flows, and which is connected at least indirectly to the measuring element.