EP3765829A1 - DIFFERENZDRUCKSENSOR ZUM BESTIMMEN EINER DIFFERENZDRUCKGRÖßE - Google Patents
DIFFERENZDRUCKSENSOR ZUM BESTIMMEN EINER DIFFERENZDRUCKGRÖßEInfo
- Publication number
- EP3765829A1 EP3765829A1 EP19705516.3A EP19705516A EP3765829A1 EP 3765829 A1 EP3765829 A1 EP 3765829A1 EP 19705516 A EP19705516 A EP 19705516A EP 3765829 A1 EP3765829 A1 EP 3765829A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- differential pressure
- piezoelectric layer
- differential
- diaphragm
- 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- Withdrawn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
- 230000001419 dependent effect Effects 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 239000000945 filler Substances 0.000 claims abstract description 6
- 239000012528 membrane Substances 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 239000012811 non-conductive material Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
- G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements
- G01L13/025—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements using diaphragms
-
- 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
- G01L19/0007—Fluidic connecting means
- G01L19/0046—Fluidic connecting means using isolation membranes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring 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
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/008—Transmitting or indicating the displacement of flexible diaphragms using piezoelectric devices
Definitions
- Differential pressure sensor for determining a differential pressure magnitude
- the invention relates to a differential pressure sensor for determining a differential pressure magnitude.
- Differential pressure sensors are used to detect differential pressures and are used in industrial metrology. There they become, for example, the
- Level measurement or used for flow measurement.
- level measurement for example, the difference between a first pressure acting down in a container and a second pressure prevailing above the contents is measured. The difference is proportional to a level-dependent hydrostatic pressure in the tank and thus to the level.
- flow measurement for example, a flow resistance is used in a line and by means of a
- Differenz horrinsetz a difference of a prevailing before the resistance first high pressure side pressure and a prevailing behind the resistance second low pressure side pressure determined. This differential pressure is a measure of the flow through the pipe.
- semiconductor differential pressure transducers e.g. Silicon chips with doped resistive elements, used as pressure-sensitive elements.
- Corresponding differential pressure transducers typically have a measuring diaphragm, one side of which is subjected to a first pressure during measuring operation and the second side to a second pressure. The acting pressures cause a resulting deflection of the measuring diaphragm, which corresponds to the differential pressure to be measured.
- Semiconductor pressure transducers are usually very sensitive and therefore are not directly exposed to a medium whose pressure is to be absorbed. Instead, be with one
- hydraulic path is connected to a pressure chamber into which the
- Differential pressure transducer is arranged such that a first side of the
- Measuring diaphragm is supplied to the voltage applied to this separation membrane pressure.
- Pressure receiving chamber supplied via the means of a second hydraulic path of the pressure applied to this separation membrane pressure of a second side of the measuring membrane becomes. Based on the two supplied pressures can thus determine the differential pressure transducer, the differential pressure transducer.
- Differential pressure sensors designed so that they in addition to the differential pressure transducer for determining the differential pressure and an absolute pressure transducer for
- a disadvantage of this variant is that the integration of two pressure transducers, the construction and connection technology is complicated and thus expensive. Also, in this variant, an increased amount of transfer fluid is needed because both pressure transducers the appropriate pressure must be supplied. An increased amount of transmission fluid in turn has the disadvantage that the
- the differential pressure sensor according to claim 1 for determining a differential pressure variable comprises:
- a differential pressure transducer with a measuring diaphragm and a circuit for converting a pressure-dependent deformation of the measuring diaphragm into the differential pressure variable
- Transmission fluid filled pressure chamber is located, in which a filler body is arranged with a recess to cavities between walls of the
- Differential pressure transducer is acted upon on a first measuring diaphragm side with the first pressure, wherein via the second hydraulic path a second diaphragm side measurement at the second opening is acted upon by the second pressure, so that the deformation of the diaphragm represents the differential pressure magnitude between the first pressure and the second pressure, wherein within the pressure chamber, a piezoelectric layer for determining a
- Absolute pressure size of the first pressure is provided. According to the invention, it is therefore proposed that a piezoelectric layer is introduced within the pressure chamber so that the absolute pressure magnitude of the first pressure prevailing in the pressure chamber or the so-called static pressure of the medium can be determined.
- the first pressure is understood to mean the pressure of the high-pressure side, the absolute pressure magnitude of which is accordingly also determined.
- the invention is independent of whether the first pressure now represents the pressure of the high pressure side or the pressure of the low pressure side.
- Piezoelectric layers have the advantage over the variant known from the prior art that they are easier to integrate and, since these materials can also be produced today by semiconductor processes, are at the same time also more favorable. Although it is not possible to achieve a precise measurement nowadays, as is possible, for example, with an absolute pressure transducer manufactured especially for this purpose, the precision already achieved today for determining the static pressure or the absolute pressure magnitude by means of the piezoelectric layer is sufficient. Differential pressure sensors according to the invention also offer the advantage that they manage with less transmission fluid, since no additional pressure transducer is needed. In addition, it is possible in the differential pressure sensors according to the invention to reduce the size in comparison to the known from the prior art two-chip variants.
- An advantageous embodiment of the differential pressure sensor according to the invention provides that the piezoelectric layer is at least partially applied to at least one wall of the pressure chamber and / or the filling body.
- a further advantageous embodiment of the differential pressure sensor according to the invention provides that between the wall of the pressure chamber or the packing and the piezoelectric layer, a first electrically conductive layer for deriving a first electrical signal of a first side of the piezoelectric layer is applied, wherein the piezoelectric layer on the electrically conductive layer is applied and the electrically conductive layer is exposed at least in sections, so that over at least one contacting surface, the first electrical signal of the first side of the piezoelectric layer is derivable.
- Differential pressure sensor provides that a second electrical layer for deriving a second electrical signal of a second side of the piezoelectric layer is applied to the piezoelectric layer, wherein the second electrical signal is derived via bonding wires which are fixed on the second electrical layer.
- the filler has an electrically non-conductive material, in particular a glass, a plastic, a ceramic.
- a further advantageous embodiment of the differential pressure sensor according to the invention provides that the piezoelectric layer substantially completely covers the wall of the pressure chamber or the filling body.
- a further advantageous embodiment of the differential pressure sensor according to the invention provides an evaluation unit, which is supplied with the first and second electrical signal and which is adapted to determine the absolute pressure magnitude of the first pressure based on the first and second electrical signal.
- Differential pressure sensor provides that in the case that the piezoelectric layer, the side wall of the pressure chamber is at least partially covered or applied to an insulating layer between the wall and the piezoelectric layer is provided.
- FIG. 2 shows a first embodiment of a carrier body of a differential pressure sensor according to the invention
- FIG. 3 shows a second embodiment of a carrier body of a differential pressure sensor according to the invention
- 4 shows an exemplary partial layer structure of an inventive
- Fig. 1 shows a section through a known from the prior art construction of a differential pressure sensor.
- This comprises a pressure transmitter 30 with a constructed of several parts diaphragm seal body 31 a, 31 b, 31 c and a
- Differential pressure transducer 20 and an absolute pressure transducer 70 which are both formed as a semiconductor pressure transducer.
- the diaphragm seal body 31 comprises in the example shown in FIG.
- Substantially massive block 31 a made of a metal, in particular of a steel or stainless steel, and a carrier body 31 b which serves as a carrier for the two pressure transducer 20, 70.
- the massive block 31 a has on a side surface a first
- T rennmembran 37 a on and on a side surface opposite the first side surface also a first separation membrane 37 b.
- Separating diaphragms 37a and 37b respectively close a first pressure-receiving chamber 38a, 38b integrated externally in the solid block.
- first pressure-receiving chamber 38a, 38b integrated externally in the solid block.
- Both pressures p1 and p2 are shown by an arrow in FIG. 1 by way of example.
- the two pressures p1 and p2 are each fed via a first or a second hydraulic path 34a, 34b to the two pressure transducers 20, 70.
- the first hydraulic path 34a extends from a first opening 35a of the first pressure-receiving chamber 38a through the solid block 31a via a capillary tube system 31c to a second opening 36a in the first
- the first hydraulic path 34a thus opens into a pressure chamber 32 integrated in the carrier body 31b, which feeds the first pressure p1 of a front side 21a to a measuring diaphragm 21 of the differential pressure transducer 20.
- Both the pressure chamber 32 and the first hydraulic path 34 a are filled with a transfer liquid 39 to transfer the corresponding pressure.
- the differential pressure sensor 1 also has a filling body 33 introduced into the pressure chamber 32. Through the filling body 33 cavities between walls of the pressure chamber and the pressure transducers 20, 70, which are each embedded in a recess of the filling body 33, filled.
- the second hydraulic path 34b extends from the first opening 35b of the first pressure-receiving chamber 38b again through the solid block 31a via
- Capillary tube system 31 c to a second opening 36 b in the carrier body 31 b.
- the second opening 36b is provided in such a manner in the carrier body 31b that the second pressure p2 transmitted via the second hydraulic path 34b is fed to a rear side 21b of the measuring diaphragm 21 of the differential pressure transducer 20.
- the second hydraulic path 34b is likewise filled with the transfer fluid 39.
- the measuring diaphragm 21 undergoes a pressure-dependent deflection.
- the pressure-dependent deflection can in turn be detected metrologically, for example by piezoresistive elements integrated in the measuring diaphragm 21, so that a differential pressure variable can be determined by a circuit 22 for converting the pressure-dependent deflection.
- the piezoresistive elements and capacitive elements for metrological detection of the pressure-dependent deflection can be used.
- the first pressure p1 is also guided to a front side 71 a of a measuring diaphragm 71 of the absolute pressure transducer, so that the
- Measuring diaphragm 71 also experiences a dependent of the first pressure p1 deflection, which in turn can be detected by measurement to determine an absolute pressure measurement variable.
- Pressure transducer 20, 70 an increased effort in terms of construction
- both pressure transducers which are usually designed as a semiconductor pressure transducer, must be introduced into the packing. That they must be placed accordingly, aligned and then fixed, for example glued.
- both pressure transducers when placing the pressure transducers to each other and possible distance requirements with regard to Ex-protective measures are observed. But not only the construction and connection technology suffers under such a structure, and the pressure chamber must be dimensioned correspondingly large that both
- Fig. 2 shows a first embodiment of a carrier body 31 b of a
- the differential pressure sensor does not have an absolute pressure transducer in the form of a semiconductor component. Rather, in the pressure chamber of the T räger stresses integrated packing has a piezoelectric layer 40 for determining the first pressure p1.
- the piezoelectric layer 40 is applied essentially over the whole area on a side surface or wall of the filling body.
- a first electrically conductive layer 50 is provided which has been applied to the side surface or wall of the filling body 33 before the application of the piezoelectric layer 40.
- the first electrically conductive layer 50 has at least one sectionally defined projection as the contacting surface 51.
- the supernatant may, as shown in FIG. 2, be designed in such a way that both layers are substantially circular, wherein the piezoelectric layer 40 has a smaller diameter than the first electrically conductive layer 50, so that an edge region as a projection and thus as Contact surface 51 arises.
- the edge region is shown in FIG. 2 by way of example by the dashed circle.
- the first electrically conductive layer 50 may have a further section-wise exposed projection, which is designed such that it does not protrude on all sides, as is the case with the circular projection, beyond the piezoelectric layer, but only in a locally limited area ,
- bond wires for electrical contacting can be fixed to the contacting surface 51, so that the first electrical signal of a first side
- a second electrical signal may be derived by:
- the first and second electrical signal is an evaluation unit 70, in particular a correspondingly equipped microprocessor supplied, which is adapted to determine based on the first and second electrical signal, an absolute pressure variable of the first pressure p1 or a so-called static pressure pstat of the medium.
- the evaluation unit 70 can be designed, for example, as part of the circuit 20 for converting the pressure-dependent deformation of the measuring diaphragm or separately therefrom.
- Fig. 3 shows a second embodiment of a carrier body of a
- the piezoelectric layer 40 is substantially not applied over the entire surface on a side surface or wall of the packing, but rather only partially or partially the side surface or wall of the packing covered.
- Both Fig. 2 and Fig. 3 each show the covering of a wall of the filling body 33.
- the piezoelectric layer 40 at least partially covers a side wall of the pressure chamber 32, which is not a wall of the filling body 33.
- an insulating layer may be provided between the side wall and the piezoelectric layer.
- the invention also does not exclude that the piezoelectric layer partially covers both a wall of the pressure chamber 32 and partially a wall of the filling body 33.
- the piezoelectric layer partially covers both a wall of the pressure chamber 32 and partially a wall of the filling body 33.
- Fig. 4 shows an exemplary partial layer structure of a differential pressure sensor according to the invention to illustrate a possibility of electrical
- the layer structure shown in Fig. 4 comprises the first serving as a first electrode electrically conductive layer 50 which is disposed on the wall of the support body 31 b, the piezoelectric layer arranged thereon 40 and a second serving as a second electrode electrically conductive layer 53.
- the first electrically conductive layer 50 has at least one sectionally defined projection serving as the contacting surface 51. The supernatant is, contrary to the example shown in FIG. 2, designed in such a way that the
- Recess 54 so that the first electrically conductive layer 50 is at least partially exposed.
- Other variants not shown in FIG. 4 for exposing the first electrically conductive layer in sections are, for example, holes which are located in the two layers 40, 53.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018105867.5A DE102018105867A1 (de) | 2018-03-14 | 2018-03-14 | Differenzdrucksensor zum Bestimmen einer Differenzdruckgröße |
| PCT/EP2019/053850 WO2019174858A1 (de) | 2018-03-14 | 2019-02-15 | DIFFERENZDRUCKSENSOR ZUM BESTIMMEN EINER DIFFERENZDRUCKGRÖßE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3765829A1 true EP3765829A1 (de) | 2021-01-20 |
Family
ID=65440986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19705516.3A Withdrawn EP3765829A1 (de) | 2018-03-14 | 2019-02-15 | DIFFERENZDRUCKSENSOR ZUM BESTIMMEN EINER DIFFERENZDRUCKGRÖßE |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11237069B2 (de) |
| EP (1) | EP3765829A1 (de) |
| CN (1) | CN111837021A (de) |
| DE (1) | DE102018105867A1 (de) |
| WO (1) | WO2019174858A1 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019130571A1 (de) * | 2019-11-13 | 2021-05-20 | Endress+Hauser SE+Co. KG | Drucksensor zur Bestimmung des Drucks eines Prozessmediums |
| DE102019133816A1 (de) * | 2019-12-10 | 2021-06-10 | Endress+Hauser SE+Co. KG | Drucksensor zum Bestimmen einer Relativdruckgröße |
| DE102019133808A1 (de) * | 2019-12-10 | 2021-06-10 | Endress+Hauser SE+Co. KG | Drucksensor zum Bestimmen einer Differenz- oder Relativdruckgröße |
| DE102020116175A1 (de) | 2020-06-18 | 2021-12-23 | Endress+Hauser SE+Co. KG | Druckmessaufnehmer |
| DE102020116172A1 (de) | 2020-06-18 | 2021-12-23 | Endress+Hauser SE+Co. KG | Differenzdruckmessaufnehmer |
| DE102020133204A1 (de) * | 2020-12-11 | 2022-06-15 | Endress+Hauser SE+Co. KG | Verfahren zum Herstellen eines Differenzdruckmessaufnehmers und entsprechender Differenzdruckmessaufnehmer |
| DE102023125753A1 (de) * | 2023-09-22 | 2025-03-27 | Endress+Hauser SE+Co. KG | Drucksensor zur Bestimmung des Drucks eines Prozessmediums |
| DE102023125755A1 (de) * | 2023-09-22 | 2025-03-27 | Endress+Hauser SE+Co. KG | Drucksensor zur Bestimmung des Drucks eines Prozessmediums |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2712846A1 (de) * | 1976-03-24 | 1977-11-24 | Ict Instr Inc | Messumformer zum messen von druckunterschieden |
| US4329877A (en) * | 1980-07-01 | 1982-05-18 | Honeywell Inc. | Adjustable overload mechanism for a differential pressure transmitter |
| CN2093392U (zh) | 1991-05-20 | 1992-01-15 | 华东工学院 | 高频响压电薄膜式压力传感器 |
| DE19608321C2 (de) * | 1996-02-22 | 2002-01-24 | Abb Patent Gmbh | Differenzdruckmeßumformereinheit mit einem Überlastschutzsystem |
| DE102004019222A1 (de) * | 2004-04-21 | 2005-11-10 | Abb Research Ltd. | Vorrichtung und Verfahren zur Zustandsüberwachung eines Druckmesswerks |
| US7430917B2 (en) * | 2006-04-10 | 2008-10-07 | Rosemount Inc. | Process transmitter with self sealing fill fluid system |
| DE102006057829A1 (de) * | 2006-12-06 | 2008-06-12 | Endress + Hauser Gmbh + Co. Kg | Differenzdruckaufnehmer |
| DE102008019054A1 (de) * | 2008-04-15 | 2009-11-05 | Endress + Hauser Gmbh + Co. Kg | Differenzdrucksensor |
| DE102011002900A1 (de) * | 2011-01-20 | 2012-07-26 | Siemens Aktiengesellschaft | Druckmessumformer |
| DE102011006517A1 (de) * | 2011-03-31 | 2012-10-04 | Endress + Hauser Gmbh + Co. Kg | Druckfest gekapselter Differenzdrucksensor |
| CH709550A1 (fr) * | 2014-04-22 | 2015-10-30 | Memsens S Rl | Capteur de pression différentielle. |
| DE102018121446A1 (de) * | 2018-09-03 | 2020-03-05 | Endress+Hauser SE+Co. KG | Differenzdruck-Messaufnehmer |
-
2018
- 2018-03-14 DE DE102018105867.5A patent/DE102018105867A1/de not_active Withdrawn
-
2019
- 2019-02-15 WO PCT/EP2019/053850 patent/WO2019174858A1/de not_active Ceased
- 2019-02-15 EP EP19705516.3A patent/EP3765829A1/de not_active Withdrawn
- 2019-02-15 US US16/980,156 patent/US11237069B2/en active Active
- 2019-02-15 CN CN201980017855.6A patent/CN111837021A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US11237069B2 (en) | 2022-02-01 |
| WO2019174858A1 (de) | 2019-09-19 |
| US20210010889A1 (en) | 2021-01-14 |
| DE102018105867A1 (de) | 2019-09-19 |
| CN111837021A (zh) | 2020-10-27 |
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