EP4042123A1 - Druckmessgerät zur messung eines druckes - Google Patents
Druckmessgerät zur messung eines druckesInfo
- Publication number
- EP4042123A1 EP4042123A1 EP20780651.4A EP20780651A EP4042123A1 EP 4042123 A1 EP4042123 A1 EP 4042123A1 EP 20780651 A EP20780651 A EP 20780651A EP 4042123 A1 EP4042123 A1 EP 4042123A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure measuring
- sensor socket
- cross
- section
- measuring device
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 claims abstract description 111
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000012528 membrane Substances 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 3
- 229920002943 EPDM rubber Polymers 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BQHQZFUAEAVJRE-UHFFFAOYSA-N 2-fluorobuta-1,3-diene Chemical compound FC(=C)C=C BQHQZFUAEAVJRE-UHFFFAOYSA-N 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0672—Leakage or rupture protection or detection
Definitions
- Pressure measuring device for measuring a pressure
- the invention relates to a pressure measuring device for measuring a pressure.
- pressure measuring devices are often used that are used to monitor a process medium.
- Such pressure measuring devices usually consist of a process connection which is used to fasten the pressure measuring device in a measuring point in an automation system.
- a pressure measuring cell is inserted flush into the process connection, i.e. facing the process, which is sealed off from the process by a process seal so that no process medium can escape or enter the housing of the pressure measuring device.
- One way of recognizing such a leaky process seal is to use electronic means, for example a sensor in the form of an electronic nose, which recognizes the entry of the process medium into a housing of the pressure measuring device.
- electronic means for example a sensor in the form of an electronic nose, which recognizes the entry of the process medium into a housing of the pressure measuring device.
- the sensor must be integrated into the pressure measuring device and, in addition, corresponding electronics are required to control the sensor.
- the object is achieved according to the invention by the pressure measuring device according to claim 1.
- a process seal which seals in a sealing plane between the sensor socket and the stop surface of the process connection in order to prevent the process medium from penetrating into the pressure measuring device; wherein the process connection and / or the sensor socket has or have several individual recesses, which are designed such that the individual recesses together form a fluidic path network consisting of several fluidic individual paths running parallel to one another, via which, in the event of a failure of the process seal, the Process medium is passed from the sealing level in the process sealing to at least one of an opening visible from the outside when the pressure measuring device is installed, the individual recesses being designed so that a cross-sectional sum of the cross-section of the recesses forming the several parallel fluidic individual paths has a predetermined minimum cross section corresponds to.
- a pressure measuring device is proposed in which the detection of leaks in the process seal is made possible by the fact that the process medium is conducted via a fluidic path network from the point of entry or the leak to an opening that is easily recognizable from the outside for an operator / service technician, so that a leak in the process seal is signaled when the process medium emerges from the opening.
- the fluid path network comprises not only a single path through which the process medium is passed, but several individual paths running parallel to one another, via which the process medium is passed from the leaky process seal to the opening.
- the sensor socket has several horizontal recesses on one end face and / or the process connection on a stop surface intended for the sensor socket and extending radially inward, the several horizontal recesses being designed so that the cross-sectional sum of the individual Cross-sections of the multiple horizontal recesses corresponds to the specified minimum cross-section.
- a further advantageous embodiment of the pressure measuring device provides that an outer jacket surface of the sensor socket in a lower sub-area, which in the installed state adjoins an inner jacket surface of the process connection and / or an inner jacket surface of the process connection in a lower sub-area, which in the installed state adjoins one or the outer jacket surface of the lower sub-area of the sensor socket, has or have several vertical recesses, the several vertical recesses being designed so that the cross-sectional sum of the individual cross-sections of the several vertical recesses corresponds to the specified minimum cross-section.
- a further advantageous embodiment of the pressure measuring device provides that the sensor socket in the lower sub-area and / or the process connection in the lower sub-area has or have at least one circumferential collecting groove for collecting the process medium supplied in particular via the horizontal recesses, the at least one collecting groove so is designed that a cross section of the collecting groove corresponds to the predetermined minimum cross section.
- a further advantageous embodiment of the pressure measuring device provides that the sensor socket has a circumferential shoulder ring up to which the sensor socket is inserted into the opening of the process connection in the installed state, and the sensor socket has a further circumferential collecting groove, preferably directly adjacent to the shoulder ring, which is designed to guide the process medium to the at least one externally visible opening, the further collecting groove being designed such that a cross section of the further collecting groove corresponds to the predetermined minimum cross section.
- a further advantageous embodiment of the pressure measuring device provides that the at least one opening visible from the outside is designed such that a cross section or a cross section sum corresponds to the specified minimum cross section.
- the embodiment can provide that the at least one externally visible opening is or are formed on a rear side of the process connection on which the shoulder ring of the sensor socket rests in the installed state.
- the specified minimum cross-section corresponds to a specification of a standard, in particular a hygiene-related standard of the European Hygienic Equipment Design Group and / or 3-A, in particular the standard 74-07 of 3-A published in March 2019
- a further advantageous embodiment of the pressure measuring device provides that the specified minimum cross section is at least 4.9 square millimeters (mm2), preferably at least 5 mm2, particularly preferably at least 7.2 mm2.
- mm2 square millimeters
- FIG. 4 shows a perspective view of an embodiment of the sensor socket
- FIG. 1 shows a partial section through a pressure measuring device 100 designed according to the invention.
- the pressure measuring device 100 shown in FIG. 1 comprises several main elements, a rotationally symmetrical sensor socket 400, a pressure measuring cell 500 inserted flush into the sensor socket 400, a likewise rotationally symmetrical process connection 300 for attaching the pressure measuring device 1 a wall of a container or pipe containing a process medium, a process seal 600 for sealing the pressure measuring cell 500 used at the front from the process, and a housing 200 fastened via a housing adapter 210.
- the rotationally symmetrical sensor socket 400 has an essentially hollow cylindrical body with a shoulder ring 420 running around the outside, a lower part 430 adjoining the shoulder ring 420 that can be introduced into the process connection 300, and an upper part 410 adjoining the shoulder ring 420.
- the lower part 430 of the sensor socket 400 is designed in such a way that the sensor socket can be inserted via it into a corresponding opening 33 of the process connection 300.
- the shoulder ring 420 has several, preferably concentric bores 421, through which the housing 202 can be connected to the process connection 300 by means of screws 220.
- the sensor socket 400 also has, at an end opposite the housing, an inwardly extending, radially circumferential stop surface 433.
- the pressure measuring cell 500 is introduced flush with the front into the sensor socket 400 via the stop surface 433 and can be positioned with the aid of an additional rotationally symmetrical centering ring 700.
- the centering ring 700 has an essentially rotationally symmetrical L-shaped cross section with a short and a long leg piece 710 and 720.
- the stop surface 43 and the centering ring 700 are matched to one another in such a way that the centering ring 700 rests with the short leg piece 710 on the stop surface 433.
- the centering ring 700 is designed so that the long leg piece 720 surrounds the pressure measuring cell 500 on the outside essentially flush, so that the pressure measuring cell 500 is aligned centrally in the sensor socket 400.
- the pressure measuring cell 500 used is preferably a ceramic pressure measuring cell which has a, preferably ceramic, base body 510 and a pressure-sensitive, preferably ceramic measuring membrane 520, which moves out of its rest position depending on a pressure acting on it.
- the measuring membrane 520 and the base body 510 are joined to one another in a pressure-tight manner at their edge, forming a measuring chamber by means of a joint 530.
- the pressure measuring cell has one or more transducer elements. All converter elements known from the prior art come into consideration as converter elements. However, the transducer elements are preferably capacitive transducer elements. Capacitive
- Transducer elements usually have at least one electrode arranged on an inside of the measuring membrane and at least one counter-electrode arranged on an outside of the base body opposite the inside and facing the measuring membrane.
- the rotationally symmetrical process connection 300 in turn has an inwardly extending, radially circumferential stop surface 310 at an end (front side) 370 facing the process when installed, up to which the sensor socket 400 with the pressure measuring cell 500 is introduced into the process connection 300.
- the pressure measuring cell 500 is introduced into the sensor socket 400 in such a way that the pressure-sensitive measuring membrane 520, when installed, is directed towards the process (front-flush).
- a radially circumferential process seal 600 is introduced between the pressure measuring cell 500 and the process connection 300 in order to prevent the process medium from penetrating between the process connection and the sensor socket.
- the process seal 600 can be designed, for example, in the form of an O-ring and consist of a material that is resistant to the process medium.
- the process seal can comprise ethylene-propylene-diene rubbers (EPDM), fluororubber (FKM), perfluororubber (FFKM), nitrile rubber (NBR) or fluoroprene.
- the stop surface of the process connection 310 can be designed such that the stop surface 310 extends further inward beyond the stop surface of the sensor socket 433 for the centering ring extends and in this area, has a recess 320 for receiving the process seal 600. Furthermore, in order to reduce creep of the process seal, a tab 434 can be provided on the inner end of the stop surface of the sensor socket.
- FIG. 4 shows a perspective view of a correspondingly configured sensor socket.
- the sensor socket has eight radially outwardly extending recesses (horizontal recesses) 435 on the end face, via which the process medium is guided in the event of failure of the process seal 600.
- a plurality of horizontal recesses can also be made in the stop surface 310 for the sensor socket of the process connection 300.
- the process medium is guided through the horizontal recesses 435 as far as an outer jacket surface 431 of the lower part 431 of the sensor socket 400.
- the lower part 431 of the sensor socket 400 can have a circumferential lower collecting groove 438 adjoining the end face, in which the supplied process medium is collected.
- the outer jacket surface of the lower part of the sensor socket 431 can have a plurality of vertical recesses 436.
- the lower part of the sensor socket can have an upper collecting groove 439 which is directly adjacent to the shoulder ring and into which the vertical recesses 436 open.
- the vertical recesses 436 are thus designed in such a way that, in the installed state, a fluidic connection is created between the lower and upper collecting grooves 438, 439, via which the process medium is conducted.
- an inner jacket surface 380 of the process connection 300 which in the installed state adjoins the outer jacket surface 431 of the lower part 430 of the sensor jack 400, can have several vertical recesses exhibit. This can be useful, for example, if, due to the design of the sensor socket, it does not have sufficient material in the wall area to be able to realize corresponding vertical recesses.
- the horizontal and / or vertical recesses 435, 350, 436 can, for example, have been made at the corresponding point by milling.
- recesses 435, 350, 436 can also be designed in the form of slots.
- a fluidic path network consisting of several fluidic individual paths EP1, EP2, EP3 and EP4 go to the groove 340 is formed
- Process medium penetrating due to a defective process seal 600 from a sealing level in which the process seal 600 forms a pressure-tight connection between the contact surface of the process connection and the sensor socket resting on the contact surface with the end face, led to the opening 340, which is clearly visible from the outside.
- the opening 340 can, as shown in FIG. 5, be formed on a rear side 360 of the process connection facing away from the end face. Furthermore, instead of a single opening 340, a plurality of openings can also be provided.
- Each individual path thus comprises a horizontal recess 435 which opens into the lower collecting groove 438 adjoining the end face of the sensor socket 400, a vertical recess 436 which opens into the lower collecting groove 438 with an upper collecting groove 439 adjoining the shoulder ring and the one adjoining the shoulder ring upper collecting groove 439.
- the recesses 435, 350, 436 are designed such that a cross-sectional sum of the cross-section of the recesses forming the multiple individual fluidic paths running parallel to one another corresponds to a predetermined minimum cross-section.
- the specified minimum cross-section corresponds to a specification from a standard, in particular a standard (hygiene standard) of the European Hygienic Equipment Design Group (EHEDG) and / or 3-A.
- the specified minimum cross-section corresponds to the 74-07 standard, published in March 2019.
- the specified minimum cross-section can be at least 4.9 square millimeters (mm2), preferably at least 5 square millimeters (mm2), particularly preferably at least 7.2 square millimeters (mm2). List of reference symbols
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019127315.3A DE102019127315A1 (de) | 2019-10-10 | 2019-10-10 | Druckmessgerät zur Messung eines Druckes |
DE102020121981.4A DE102020121981A1 (de) | 2020-08-21 | 2020-08-21 | Druckmessgerät zur Messung eines Druckes |
PCT/EP2020/076666 WO2021069218A1 (de) | 2019-10-10 | 2020-09-24 | Druckmessgerät zur messung eines druckes |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4042123A1 true EP4042123A1 (de) | 2022-08-17 |
Family
ID=72659223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20780651.4A Withdrawn EP4042123A1 (de) | 2019-10-10 | 2020-09-24 | Druckmessgerät zur messung eines druckes |
Country Status (4)
Country | Link |
---|---|
US (1) | US20240060841A1 (de) |
EP (1) | EP4042123A1 (de) |
CN (1) | CN114585894A (de) |
WO (1) | WO2021069218A1 (de) |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9823041D0 (en) * | 1998-10-22 | 1998-12-16 | British Gas Plc | Measuring leakage through ducts |
DE10131855A1 (de) * | 2001-06-30 | 2003-01-23 | Endress & Hauser Gmbh & Co Kg | Druckmittler mit Vorrichtung zur Erkennung von Membranbrüchen und Anschlußadapter mit Vorrichtung zur Erkennung von Membranbrüchen |
DE10255279A1 (de) * | 2002-11-26 | 2004-06-03 | Endress + Hauser Gmbh + Co. Kg | Messumformer mit Lecküberwachung |
JP2004286536A (ja) * | 2003-03-20 | 2004-10-14 | Denso Corp | 圧力センサ |
US7036382B2 (en) * | 2003-04-10 | 2006-05-02 | Ashcroft, Inc. | Liquidless seal connection |
DE102006043499A1 (de) * | 2006-09-12 | 2008-03-27 | Endress + Hauser Gmbh + Co. Kg | Verfahren und Vorrichtung zur Diagnose von Flüssigkeitsverlusten in mit Druck übertragenden Flüssigkeiten gefüllten Druckmessaufnehmern |
DE102010029955A1 (de) * | 2010-06-10 | 2011-12-15 | Endress + Hauser Gmbh + Co. Kg | Drucksensor mit einer zylindrischen Druckmesszelle |
GB2514350A (en) * | 2013-05-20 | 2014-11-26 | Linde Ag | A pressurised fluid container |
DE102014102719A1 (de) * | 2014-02-28 | 2015-09-03 | Endress + Hauser Gmbh + Co. Kg | Differenzdruckmessaufnehmer |
CN204373838U (zh) * | 2015-02-04 | 2015-06-03 | 马鞍山市奈特仪表科技有限公司 | 一种安全防泄漏充油表 |
DE102015104365A1 (de) * | 2015-03-24 | 2016-09-29 | Endress + Hauser Gmbh + Co. Kg | Drucksensor |
DE102016204511B3 (de) * | 2016-03-18 | 2017-03-30 | Ifm Electronic Gmbh | Druckmessgerät |
DE102016120326A1 (de) * | 2016-10-25 | 2018-04-26 | Endress+Hauser SE+Co. KG | Verfahren zur Zustandsüberwachung eines elektromechanischen Resonators |
DE102016123218A1 (de) * | 2016-12-01 | 2018-06-07 | Endress+Hauser SE+Co. KG | Druckaufnehmer mit einem Prozessanschluss |
DE102016015447A1 (de) * | 2016-12-24 | 2017-03-30 | Wika Alexander Wiegand Se & Co. Kg | Druckmittler mit evakuierter Doppelmembran und Vakuumüberwachung |
-
2020
- 2020-09-24 EP EP20780651.4A patent/EP4042123A1/de not_active Withdrawn
- 2020-09-24 US US17/754,565 patent/US20240060841A1/en active Pending
- 2020-09-24 WO PCT/EP2020/076666 patent/WO2021069218A1/de active Application Filing
- 2020-09-24 CN CN202080070307.2A patent/CN114585894A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
CN114585894A (zh) | 2022-06-03 |
US20240060841A1 (en) | 2024-02-22 |
WO2021069218A1 (de) | 2021-04-15 |
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