Pressure Transducer

Measuring Principle

The piezo-resistive principle is based on the conversion of the mechanical value "pressure" into an electic signal. This conversion is caused by the elastic bending of a diaphragm of monocrystalline silicon. A Wheatstone bridge diffused into the diaphragm changes its resistance caused by pressure influence. This change is measured by a microcomputer taking into account the sensor-specific data as well as the compensation of the temperature influence. The pressure-proportional signal is further processed in the transducer electronic unit and linearized. This digital signal with a high noise immunity is transmitted via the SENSORbus to the processing unit.

Measurement systems

The sensor can be loaded directly with the measuring media.

The sensor is not in contact with the measuring media.

Technical Characteristics

Measuring ranges 0 ... 0.1 bar to 0 ... 200 bar (0 ... 1.45 psi to 0 ... 2900 psi) Accuracy class (linearity, histeresis, repeatability) 0.1 % FS (Option 0.05 %) Temperature influence Typ. 30 ppm/ºC Accuracy of the temperature measurement < 1.5 ºC Acid resistance pH5 ... pH9, other values on request Protection class Thread mount: IP65 (Nema 4X) Submersible: IP68 (submersible) Operating temperature range -20 ºC ... +70 ºC (-38 ºC ... +70 ºC, optional) Measuring speed 4 measurements/sec Weight of probe Thread mount: 920 g Submersible: 390 g Overvoltage protection Thread mount: In-built Submersible: external

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Pressure Sensor Submersible-Type, (MPxSTRN)

Short Description

The pressure transducer contains a gauge-sensor which compensates the atmospheric pressure changes. The compenstation of the atmospheric pressure is performed by the vented SENSORbus cable. The intelligent transducer electronics also controls the communication with the processing unit and includes cyclic selftests. The slim sensor requires little space an is therefore especially suitable for the measurement of groundwater levels, pump sumps, river and navigation lock leves, etc. opened submersible-sensor

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Pressure Sensor Thread Mount Type, (MPxSGRN)

Short Description

The pressure transducer contains a gauge-sensor which compensates the atmospheric pressure changes Besides the pressure, the temperature of the measured medium is detected. It can also be displayed and issued by the processing unit. The incorporated intelligent transducer electronic unit also controls the communication with the processing unit and invokes cyclic selftests. The pressure sensor is designed for measuring level in open and closed tanks as well as for measuring pressure in penstocks. Measurements can be realised either hydrostatically or with a bubbling system.

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Vented Cable

Working principle The vented cable is a special construction used for baromentric pressure compenstation in connection with submersible gauge pressure transducers. Weight of 1 m cable: 72 g

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