DE102010063115A1 - Pressure measuring arrangement for measuring absolute or differential pressure of industrial process medium, has membrane structure that is provided and secured on outside of cylindrical base - Google Patents

Pressure measuring arrangement for measuring absolute or differential pressure of industrial process medium, has membrane structure that is provided and secured on outside of cylindrical base

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Publication number
DE102010063115A1
DE102010063115A1 DE201010063115 DE102010063115A DE102010063115A1 DE 102010063115 A1 DE102010063115 A1 DE 102010063115A1 DE 201010063115 DE201010063115 DE 201010063115 DE 102010063115 A DE102010063115 A DE 102010063115A DE 102010063115 A1 DE102010063115 A1 DE 102010063115A1
Authority
DE
Germany
Prior art keywords
membrane
pressure
pressure measuring
measuring arrangement
outside
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE201010063115
Other languages
German (de)
Inventor
Markus Berger
Christoph Bollig
Volker Frey
Dietmar Salg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Priority to DE201010063115 priority Critical patent/DE102010063115A1/en
Publication of DE102010063115A1 publication Critical patent/DE102010063115A1/en
Application status is Pending legal-status Critical

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0042Constructional details associated with semiconductive diaphragm sensors, e.g. etching, or constructional details of non-semiconductive diaphragms
    • G01L9/0048Details about the mounting of the diaphragm to its support or about the diaphragm edges, e.g. notches, round shapes for stress relief

Abstract

The pressure measuring arrangement (10) has cylindrical base (12) and circular membrane (14) that are made of different metallic materials. A membrane structure (16) is provided and secured on outside of the cylindrical base.

Description

  • Pressure measuring arrangements are well known from industrial process measuring technology. They serve there in various designs for determining an absolute pressure, a relative pressure or a differential pressure. Known pressure measuring arrangements comprise a base body and a membrane fastened thereon, which is deformed by pressure loading of a medium in the direction of the base body. An occurring stroke of the membrane is tapped by suitable methods, usually electrically, and gives a measure of the auflastenden pressure. The pressure cell works as a pressure transducer.
  • Pressure measuring cells of the type mentioned are connected to so-called process adapters or used in such, in order to be able to come into direct contact with the medium in an industrial process, the pressure of which is to be determined. There are also pressure measuring cells, which have a flange as the base body, on which a pressure-sensitive membrane is attached. The flange can then be connected directly to a counter flange of a process line or to a nozzle of a container. It is clear to the person skilled in the art that said pressure measuring cells furthermore have electrical connections for relaying the actual transducer signals or measuring signals to an electronic evaluation circuit which generates the desired measured variable from the measuring signals.
  • If the actual measuring diaphragm of the pressure measuring cell is not itself to be exposed to the process medium to be measured, either because the process medium is chemically very aggressive or because it has a very high temperature, a so-called diaphragm seal device is used, which taps the pressure of the process medium and transfers to the actual pressure transducer. Such pressure-sensitive device often also comprise a membrane support, similar to the above-mentioned base body, on which a membrane, also called separation membrane, is attached, which comes into contact with the process medium to be measured. An intermediate space between the separation membrane and the membrane support is connected to a liquid-filled capillary line and transfers the pressure of the process medium on the separation membrane to a pressure measuring cell connected to the capillary line.
  • It has been shown in practice that directly in contact with the process medium in contact membranes, whether membranes of a pressure cell or those of a diaphragm seal device, must be made of a special material, as they aggressive process media or often aggressive cleaning methods of piping and containers to resist. On the one hand, membranes of this type must react flexibly to changes in pressure, on the other hand, they should be able to withstand high pressures and pressure peaks. In the practice of industrial process measurement technology, therefore, very thin diaphragms made of special materials, such as nickel alloys of 0.025-0.1 mm thickness, are used, which are very cost-intensive, which makes the pressure measuring cells or diaphragm seal devices more expensive.
  • The invention is therefore an object of the invention to provide a comparison with conventional pressure measuring cells or diaphragm seal devices inexpensive pressure measuring arrangement.
  • This object is achieved by a pressure measuring arrangement, the
    • A cylindrical basic body made of a first metallic material,
    • A circular membrane of a second metallic material,
    • - Which spans a membrane bed
    • - And outside the membrane bed is attached to the body.
  • In a first embodiment of the invention, the pressure measuring arrangement serves as a pressure transmitter, wherein the base body is a membrane carrier in the form of a flange and the membrane is a separation membrane.
  • In a second embodiment of the invention, the pressure measuring arrangement according to the invention is a pressure measuring cell.
  • In further embodiments of the pressure measuring arrangement according to the invention, the membrane or separating membrane is fastened on the base body or membrane carrier at least by means of two annular, concentric welds.
  • The advantage of the invention is that two different metallic materials are used for the base body or membrane carrier and membrane or separating membrane. Thus, a highly alloyed and expensive material for membrane or separation membrane can be used that is tailored exactly to the desired properties, while for the inherently massive body or membrane support a significantly cheaper material can be used. In addition, the base body or membrane support needs to be processed only at the points that are to serve as a support for the membrane or separation membrane or for the membrane bed.
  • In the following, the invention will be described and explained in more detail, reference being made to the attached drawing which represents a preferred embodiment of the invention.
  • A pressure measuring arrangement according to the invention 10 includes a cylindrical body 12 made of metal and a circular membrane mounted thereon 14 one in the main body 12 incorporated membrane bed 16 spans. The membrane 14 is a relatively thin-walled metallic foil, the one with " 18 "Designated elastic range and one with" 20 "Designated area where it is the main body 12 dressed. A centerline of the pressure measuring arrangement 10 is with 22 designated.
  • The main body 12 itself is in the illustrated embodiment of the invention, a flange which can be bolted to a counter flange, not shown here. By way of illustration, there is a hole in the drawing 24 represented the bolt circle.
  • The membrane 14 is in the illustrated embodiment of the invention with two annular welds 26 . 28 on the body 12 attached, with the inner weld 26 directly outside the membrane bed 16 is arranged and the elastic region 18 limited to the membrane. The outer weld 26 limited by the film of the membrane 14 disguised area 20 of the basic body 12 , This disguised area 20 of the basic body 12 , So the flange shown here is to be understood as part of its sealing area against a counterflange. It makes sense, the size of the membrane 14 Therefore, chosen so that they over the desired sealing surface of the body 12 or flange protrudes.
  • The welds 26 . 28 are preferably carried out from the inside out. It is clear to the skilled person that with large flanges large membranes 14 Also, more than the two welds shown here are mounted on the flange.
  • The pressure measuring arrangement shown in the drawing 10 can be used both as the actual pressure measuring cell and as a pressure transmitter device. In the latter case, the main body 12 to a membrane carrier and the membrane 14 to a separation membrane. To illustrate, in the drawing, another hole 30 represented, preferably in the center of the membrane bed 16 is arranged and in hydraulic communication with a capillary for passing the on the membrane 14 overloading pressure.
  • As particularly advantageous for the pressure measuring arrangement according to the invention 10 1.4404 / 316L as material for the main body have as pressure measuring cell 12 and 2.4819 / Hastelloy C276 as the material for the membrane 14 shown.
  • When using the pressure measuring arrangement 10 1.4404 / 316L as material for the main body have been used as diaphragm seal device 12 and 2.4602 / Hastelloy C22 as the material for the membrane 14 shown advantageous.

Claims (4)

  1. Pressure measuring arrangement which - a cylindrical basic body ( 12 ) of a first metallic material, - a circular membrane ( 14 ) of a second metallic material, - which a membrane bed ( 16 ) spans - and outside the membrane bed ( 16 ) on the base body ( 12 ) is attached.
  2. Pressure measuring arrangement according to claim 1, which serves as a pressure transmitter and in which the base body ( 12 ) a membrane carrier in the form of a flange and the membrane ( 14 ) are a separation membrane.
  3. Pressure measuring arrangement according to claim 1, wherein the basic body ( 12 ) is a main body of a pressure measuring cell.
  4. Pressure measuring arrangement according to one of the preceding claims 1-3 in which the membrane ( 14 ) or separation membrane at least by means of two annular, concentric welds ( 26 . 28 ) on the base body ( 12 ) or membrane carrier is attached.
DE201010063115 2010-12-15 2010-12-15 Pressure measuring arrangement for measuring absolute or differential pressure of industrial process medium, has membrane structure that is provided and secured on outside of cylindrical base Pending DE102010063115A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201010063115 DE102010063115A1 (en) 2010-12-15 2010-12-15 Pressure measuring arrangement for measuring absolute or differential pressure of industrial process medium, has membrane structure that is provided and secured on outside of cylindrical base

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010063115 DE102010063115A1 (en) 2010-12-15 2010-12-15 Pressure measuring arrangement for measuring absolute or differential pressure of industrial process medium, has membrane structure that is provided and secured on outside of cylindrical base

Publications (1)

Publication Number Publication Date
DE102010063115A1 true DE102010063115A1 (en) 2012-06-21

Family

ID=46512288

Family Applications (1)

Application Number Title Priority Date Filing Date
DE201010063115 Pending DE102010063115A1 (en) 2010-12-15 2010-12-15 Pressure measuring arrangement for measuring absolute or differential pressure of industrial process medium, has membrane structure that is provided and secured on outside of cylindrical base

Country Status (1)

Country Link
DE (1) DE102010063115A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3121799A1 (en) * 1981-06-02 1982-12-23 Wiegand Gmbh & Co Alexander Measuring diaphragm for countering diffusion of pressure media
DE8713822U1 (en) * 1987-10-14 1987-12-10 Alexander Wiegand Gmbh U. Co Armaturen- U. Manometerfabrik, 8763 Klingenberg, De
DE10132269A1 (en) * 2001-07-04 2003-01-16 Endress & Hauser Gmbh & Co Kg Membrane type pressure sensor has a circular membrane that is divided into concentric areas of varying cross section, so that pressure can be measured accurately over a wide range
DE69919631T2 (en) * 1998-06-17 2005-09-15 Rosemount Inc., Eden Prairie Isoliermembranmontage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3121799A1 (en) * 1981-06-02 1982-12-23 Wiegand Gmbh & Co Alexander Measuring diaphragm for countering diffusion of pressure media
DE8713822U1 (en) * 1987-10-14 1987-12-10 Alexander Wiegand Gmbh U. Co Armaturen- U. Manometerfabrik, 8763 Klingenberg, De
DE69919631T2 (en) * 1998-06-17 2005-09-15 Rosemount Inc., Eden Prairie Isoliermembranmontage
DE10132269A1 (en) * 2001-07-04 2003-01-16 Endress & Hauser Gmbh & Co Kg Membrane type pressure sensor has a circular membrane that is divided into concentric areas of varying cross section, so that pressure can be measured accurately over a wide range

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Legal Events

Date Code Title Description
R163 Identified publications notified
R012 Request for examination validly filed
R081 Change of applicant/patentee

Owner name: ENDRESS+HAUSER SE+CO. KG, DE

Free format text: FORMER OWNER: ENDRESS + HAUSER GMBH + CO. KG, 79689 MAULBURG, DE

R082 Change of representative

Representative=s name: ANDRES, ANGELIKA, DIPL.-PHYS., DE