Endress + Hauser Gmbh + Co.

Other

Endress&plus;hauser Gmbh&plus;co.

Endress U. Hauser Gmbh U. Co.

Karlheinz Banholzer

Frank Hegner

Peter Gerst

Karl Fl&ouml;gel

Thomas Uehlin

Elke Maria Schmidt

Ulfert Drewes

Rainer Martin

Bernd Rosskopf

Peter Jung

Karl Flögel

Winfried Maier

A pressure sensor that is particularly suitable inter alia for the food industry and the measuring accuracy of which is stable over a long time, having a diaphragm seal () with a separating diaphragm () on which a pressure (P) to be measured acts and having a ceramic measuring cell () which is connected to the diaphragm seal () exclusively by inorganic materials, is provided, in which sensor the separating diaphragm () and all further sensor components coming into contact during measurement with a medium of which the pressure (P) is to be measured are metallic.

Pressure sensor having metallic diaphragm seal joint

A pressure sensor that is particularly suitable for the food industry and the measuring accuracy of which is stable over a long time, having a diaphragm seal with a separating diaphragm on which a pressure to be measured acts and having a ceramic measuring cell which is connected to the diaphragm seal exclusively by inorganic materials, is provided, in which sensor the separating diaphragm and all further sensor components coming into contact during measurement with a medium of which the pressure is to be measured are metallic.

Pressure sensor having metallic diaphragm seal mount

A pressure measuring device with a housing ( ) and a pressure measuring cell is provided, the pressure measuring cell being protected from interference, in particular independently of its installation position in the housing ( ), and comprising: a housing ( ), a pressure measuring cell, which has at least one pressure-sensitive measuring diaphragm ( ), on the outer side of which a pressure (P, P , P ) acts during operation, which has a transducer for converting a pressure-dependent deflection of the measuring diaphragm ( ) into an electrical measured variable and which has free outer circumferential surfaces, which are provided with an electrically conductive coating ( ), and an electronic circuit ( ) for converting the electrical measured variable into a measuring signal.

Pressure measuring device

A pressure sensor is provided having a housing, a process connection which is connected to the housing and serves to feed a medium whose pressure (p) is to be measured to a membrane which his arranged in the housing, said membrane, in operation, undergoing a deflection which depends on the pressure (p) which is to be measured, which pressure sensor can have a seal made of a chemically highly resistant material and in which the membrane can consist either of ceramic or metal, which pressure sensor has a seal which seals a gap found between the housing and the process connection and/or the membrane, bears directly against the gap and covers the gap, and which is clamped between the housing and the membrane, and which pressure sensor has a spring which is two-legged in cross section, whose first and second legs enclose an acute angle, whose first leg has a leg surface which faces away from the second leg, rests on a supporting surface and is connected fixedly to the latter, and whose second leg has a leg surface which faces away from the first leg, bears in a planar manner against the seal and exerts a spring force on the seal, which spring force acts in the direction of the gap.

Pressure sensor

A ceramic pressure measuring cell with a basic body ( ), a diaphragm ( ) connected to the basic body ( ) to form a measuring chamber ( ), which during operation undergoes a deflection dependent on a pressure (p -p ) to be measured and the deflection of which is registered by means of an electromechanical transducer and is made accessible for further evaluation and/or processing, and a bore ( ) which penetrates the basic body ( ) and into which a small pressure tube ( ) is soldered in a pressure-resistant and gastight manner, and via which a pressure (p , p ) is introduced into the measuring chamber ( ), is provided, in which a volume inside the measuring cell and the small pressure tube is precisely known, since the mechanical stop ( ) fixes a depth of penetration of the small pressure tube ( ) into the basic body ( ).

Pressure measuring cell

Evaluation unit of a differential-pressure sensor An evaluation unit of a differential-pressure sensor is provided which supplies an output signal which corresponds to a differential pressure (.DELTA.P) which has been corrected with respect to a measuring error due to the static pressure (P.sub.S). The differential-pressure sensor has a capacitive single-chamber differential-pressure measuring cell with two capacitors (4, 5) as sensor element (1), and a temperature sensor (6) is arranged at the sensor element (1). The differential-pressure measured value is corrected by means of a first correction value (.DELTA.K) which is a measure of the static pressure (P.sub.S) at a reference temperature (T.sub.R). This correction value (.DELTA.K) is determined from the difference between a sensor temperature (T.sub.S) determined by means of the temperature sensor (6) and a sum of a temperature discrepancy (T.sub.0) and an internal temperature (T.sub.i) assigned to the sum (.SIGMA.) of the reciprocal values of the capacitances of the two capacitors (4, 5).

Evaluation unit of a differential-pressure sensor

Provision is made for a pressure sensor with a ceramic sensor element (1) which is introduced in a gas-tight manner, having a metallic housing (2) and having a metallic adapter (3) which is arranged between the sensor element (1) and housing (2) and which is connected in a gas-tight manner both to the housing (2) and to the sensor element (1).

Gas tight pressure sensor sealed with flexible metallic adaptor and

The differential pressure measuring apparatus comprises a single chamber differential pressure sensor having two resilient sensor diaphragms which enclose a volume filled with a fluid. In the single chamber differential pressure sensor two measuring capacitors are formed whose capacitances vary in opposite senses in response to the sensor differential pressure between the pressures acting on the two sensor diaphragms. The single chamber differential pressure sensor is connected to an adaptor comprising a volume filled with a fluid which is closed on the one hand by one of the two sensor diaphragms and on the other hand by an elastic adaptor diaphragm. An evaluation circuit calculates the sensor differential pressure from the capacitances of the measuring capacitors. The evaluation circuit comprises a first compensation arrangment which compensates the influences of the sensor temperature and of the sensor parameters on the calculated sensor differential pressure, and a second compensation arrangement which compensates the influences of the adaptor temperature and of the adaptor parameters on the sensor differential pressure corrected by the first compensation arrangement.

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Hausen, Germany

Karlheinz Banholzer