A resonant pressure sensor includes a first substrate and a resonator. The first substrate includes a diaphragm and a projection disposed on the diaphragm. The resonator is disposed in the first substrate, a part of the resonator being included in the projection, and the resonator being disposed between a top of the projection and an intermediate level of the first substrate. The first substrate is an SOI substrate in which a silicon dioxide layer is inserted between a silicon substrate and a superficial silicon layer. The intermediate level of the first substrate is disposed in the silicon substrate, and the resonator is disposed in the projection included in the superficial silicon layer.

A resonant pressure sensor includes a first substrate and a resonator. The first substrate includes a diaphragm and a projection disposed on the diaphragm. The resonator is disposed in the first substrate, a part of the resonator being included in the projection, and the resonator being disposed between a top of the projection and an intermediate level of the first substrate. The first substrate is an SOI substrate in which a silicon dioxide layer is inserted between a silicon substrate and a superficial silicon layer. The intermediate level of the first substrate is disposed in the silicon substrate, and the resonator is disposed in the projection included in the superficial silicon layer.

A pressure measurement device for determining a pressure of a fluid located inside a cylindrical casing includes: at least one sensor for determining a force acting thereon; and a clamp for peripheral attachment to the casing. The at least one sensor is arranged inside the clamp and is operatively connected thereto. The clamp includes a peripheral link chain having chain links that are pivotably coupled to one another at end joints, and a closure device that interacts with a first chain link and a final chain link.

A connection structure of a diaphragm pressure gauge contains: a holder, a coupling sleeve, a disc, a curved abutting bar, a fixing element, a case, a screw element, a circular film, and a defining element. The holder is connected to the coupling sleeve, multiple spaced ribs of the holder extend out of the coupling sleeve, and the holder includes the multiple spaced ribs. One of the multiple spaced ribs has at least one spaced protrusion, the disc includes at least one first locating orifice, the curved abutting bar includes a second locating orifice, and the at least one first locating orifice is fitted with the second locating orifice. The curved abutting bar abuts against the fixing element, and the defining element, the circular film and the screw element are connected below the fixing element to produce the diaphragm pressure gauge. The case is covered on the diaphragm pressure gauge.

A system for non-intrusively measuring process fluid pressure within a process fluid conduit is provided. The system includes a measurement bracket configured to couple to an external surface of the process fluid conduit. The measurement bracket generates a variable gap based on deformation of the process fluid conduit in response to process fluid pressure therein. A gap measurement system is coupled to the measurement bracket and provides an electrical signal based on a measurement of the variable gap. A controller is coupled to the gap measurement system and is configured to calculate and provide a process fluid pressure output based on the electrical signal and information relative to the process fluid conduit.

A pressure gauge structure contains: a body having a bow-shaped frame and a holder mounted under the bow-shaped frame, and a contact film defined between the bow-shaped frame and the holder. A connector is connected on a bottom of the holder, and a test conduit passes through the holder and the connector and accommodates a tested object. The contact film contacts with a separation washer corresponding to the contact film.

The invention relates to a method for monitoring the pressure in a device for the pneumatic adjustment of a seat in a transportation means, in particular in a motor vehicle. The device comprises a plurality of cushions (101, 102, . . . , 105) which are able to be filled with air and which are connected via respective valves (201, 202, . . . , 205) to a common preliminary pressure volume (3), wherein a pressure sensor (4) is provided for measuring the pressure (p) in the preliminary pressure volume (3) and the preliminary pressure volume (3) is coupled to a compressor (6) for supplying compressed air without a non-return valve being connected therebetween. For the purpose of monitoring the pressure in a respective cushion (101, 102, . . . , 105), a predefined pressure is set in the preliminary pressure volume by way of operation of the compressor (6) and/or by way of air discharge from the preliminary pressure volume (3) via at least one leak, with the valve (201, 202, . . . , 205) between the respective cushion (101, 102, . . . , 105) and the preliminary pressure volume (3) closed, wherein the predefined pressure deviates from a target pressure (p1, p2, . . . , p5) in the respective cushion (101, 102, . . . , 105) by at most 10% of the target pressure and/or at most 50 hPa. After the setting of the predefined pressure, the valve (101, 102, . . . , 105) between the respective cushion (101, 102, . . . , 105) and the preliminary pressure volume (3) is opened and the pressure in the preliminary pressure volume (3) is measured via the pressure sensor (4). If the measured pressure (p) deviates from the target pressure (p1, p2, . . . , p5), the measured pressure (p) is set to the target pressure (p1, p2, . . . , p5) by way of operation of the compressor (6) and/or by way of air discharge from the preliminary pressure volume (3) via the at least one leak.

Disclosed is a sensor to measure a pressure in a fluid, of which a body 1 includes a membrane 2 and a wall 3 forming a peripheral support for and around the membrane. The membrane and the peripheral wall are formed from one single component, and the membrane and the peripheral wall together form a flat and smooth front surface 4 intended to be in contact with the fluid.

A pressure gauge structure contains: a body having a bow-shaped frame and a holder mounted under the bow-shaped frame, and a contact film defined between the bow-shaped frame and the holder. A connector is connected on a bottom of the holder, and a test conduit passes through the holder and the connector and accommodates a tested object. The contact film contacts with a separation washer corresponding to the contact film.

A pipeline for conveying concrete determines a pressure in and/or a wall thickness of the pipeline, wherein a first length portion of the pipeline has a first wall thickness and a second length portion of the pipeline has a second wall thickness greater than the first wall thickness. The determination is made using a first strain gauge on an outer side of the first length portion and a second strain gauge on an outer side of the second length portion, wherein the strain gauges are each fixedly applied to the outer side of the length portions. A strain gauge and/or the second longitudinal section of the pipeline are/is at a spacing from at least one end of the pipeline, which spacing corresponds to at least an internal diameter of the pipeline. By comparing strain gauge measurements, the wall thickness is determinable.