Pressure Measuring Device

• US 20150122040A1
• Filed: 03/19/2013
• Published: 05/07/2015
• Est. Priority Date: 04/24/2012
• Status: Active Grant

• Current Assignee: Endress+Hauser SE+Co. KG (Endress+Hauser AG)
• Original Assignee: Endress + Hauser GmbH + Company KG (Endress+Hauser AG)
• Inventors: Drewes, Ulfert, Hugel, Michael, Uehlin, Thomas, Ponath, Nils
• Granted Patent: US 10,330,547 B2
• Time in Patent Office: Days
• US Class Current: 73/724
• CPC Class Codes: G01L 9/0072 using variations in capacitance

Abstract

A pressure measuring device, comprising: a pressure measuring cell having a measuring membrane, at least one platform and a pressure chamber formed therebetween. An electrical transducer for transducing a deflection of the measuring membrane into a pressure dependent, primary signal; a cylindrical housing having a measuring cell chamber, in which the pressure measuring cell is arranged, and an end face pressure receipt opening in communication with the pressure duct; and an electronic circuit in the housing for operating the electrical transducer, and for processing the primary signal, and for outputting a measurement signal. The cylinder axis of the pressure measuring cell forms with the cylinder axis of the housing an angle, which amounts to not less than 80°, and which is especially preferably a right angle.

Claims

1-14. -14. (canceled)

15. A pressure measuring device, comprising:

an essentially cylindrical pressure measuring cell, which has at least one circular disk shaped measuring membrane and at least one platform;

a pressure duct;

a first pressure chamber formed between said measuring membrane and said platform, which is contactable with a pressure via said pressure duct, which extends through said platform;

said pressure measuring cell has an electrical transducer for transducing a pressure dependent deflection of said measuring membrane into at least one pressure dependent, electrical, primary signal;

a first electronic circuit; and

an essentially cylindrical housing, said housing has in its interior a measuring cell chamber,

said pressure measuring cell is arranged in said measuring cell chamber;

said housing has on an end face a pressure receipt opening;

said pressure duct of said pressure measuring cell communicates with said pressure receipt opening and via said opening is loadable with a media pressure present at said pressure receipt opening;

said first electronic circuit for operating the electrical transducer of said pressure measuring cell, and for processing the electrical, primary signal, and for outputting a measurement signal dependent on the primary signal, and said first electronic circuit is arranged in said housing and electrically connected with the transducer via at least one connecting line; and

the cylinder axis of said pressure measuring cell forms with the cylinder axis of said housing (40) an angle, which amounts to not less than 80°

, preferably not less than 85°

, and which is especially preferably a right angle.

16. The pressure measuring device as claimed in claim 15, further comprising:

an isolating diaphragm, which is connected at the end of said housing along a peripheral edge pressure-tightly with said housing to form a pressure receiving chamber between said housing and said isolating diaphragm, wherein;

said pressure receipt opening opens into said pressure receiving chamber; and

a hydraulic path, which extends from said pressure receiving chamber through said pressure receipt opening and said pressure duct to said pressure chamber of said pressure measuring cell, in order to transfer the pressure present on said isolating diaphragm into said pressure chamber.

17. The pressure measuring device as claimed in claim 15, wherein:

said transducer is a capacitive transducer and has at least a first electrode, which is arranged on said measuring membrane, and at least a second electrode, which is arranged on said platform; and

the capacitance between said first electrode and said second electrode is pressure dependent.

18. The pressure measuring device as claimed in claim 15, wherein:

said transducer is contacted via electrical leads through said platform;

the electrical leads leave said platform leave said platform at an end face of said platform facing away from said measuring membrane.

19. The pressure measuring device as claimed in claim 18, wherein:

said pressure duct likewise leaves said platform at the end face of said platform facing away from said measuring membrane.

20. The pressure measuring device as claimed in claim 15, further comprising:

a second electronic circuit, which is connected to said first electronic circuit, in order to receive and to process the measurement signal, and which is arranged in said housing at the side of said measuring cell facing away from said pressure input opening.

21. The pressure measuring device as claimed in claim 15, wherein:

said second electronic circuit issues at a signal output an output signal dependent on the measurement signal; and

the signal output is connected to a signal path, wherein said housing has a signal path opening, through which the signal path extends.

22. The pressure measuring device as claimed in claim 21, wherein:

the signal path opening is arranged at the end of said housing facing away from said pressure input opening.

23. The pressure measuring device as claimed in claim 15, wherein:

said pressure measuring cell further includes a second platform;

said measuring membrane is arranged between said first platform and said second platform;

a second pressure chamber is formed between said measuring membrane and said second platform; and

said second pressure chamber is evacuated or is contactable with atmospheric pressure via a second pressure duct, which extends through said second platform.

24. The pressure measuring device as claimed in claim 15, wherein:

the outer diameter of said pressure measuring cell amounts especially to not less than 80% especially not less than 90% of the outer diameter of said housing in the axial section of said measuring cell chamber.

25. The pressure measuring device as claimed in claim 15, furthermore comprising:

a support body, wherein;

said support body is arranged in said housing and pressure bearingly connected with said housing;

said pressure measuring cell is held by said support body and is connected pressure bearingly with it; and

there extends through said support body a connecting duct, which is connected pressure-tightly to said pressure input opening and to said pressure duct.

26. The pressure measuring device as claimed in claim 15. wherein:

said connecting duct includes a first section and a second section, which are connected with one another and comprise bores communicating with one another in said support body, and which extend essentially perpendicularly to one another.

27. The pressure measuring device as claimed in claim 15, wherein:

said support body comprises at least a first spigot shaped connection piece, through which said connecting duct extends;

said connection piece is arranged, and pressure bearingly joined, in a bore in said platform, through which said pressure duct extends.

28. The pressure measuring device as claimed in claim 15, wherein:

at least one platform includes at its end face facing away from said measuring membrane at least sectionally a chamfer, whose maximum cross sectional area amounts to not less than 0.5%, especially not less than 2%, preferably not less than 4%, and further preferably not less than 6% of the square of the axial dimension of said platform.