A process fluid pressure measurement probe includes a pressure sensor formed of a single-crystal material and mounted to a first metallic process fluid barrier and disposed for direct contact with a process fluid. The pressure sensor has an electrical characteristic that varies with process fluid pressure. A feedthrough is formed of a single-crystal material and has a plurality of conductors extending from a first end to a second end. The feedthrough is mounted to a second metallic process fluid barrier and is spaced from, but electrically coupled to, the pressure sensor. The pressure sensor and the feedthrough are mounted such that the secondary metallic process fluid barrier is isolated from process fluid by the first metallic process fluid barrier.

A pressure-sensor device (1) has: —a component sensitive to pressure, comprising a sensor body (5), with an elastically deformable membrane part (5a), and at least one detection element (6) for detecting a deformation of the membrane (5a); —a structure (2, 3) for housing or supporting the pressure-sensitive component, having at least one passageway (15) for a fluid the pressure of which is to be detected, the housing or supporting structure (2, 3) comprising a supporting body (2) with respect to which the sensor body (5) is positioned in such a way that its membrane part (5a) is exposed to the fluid coming out of the passageway (15), the supporting body (2) having a hydraulic-connection portion (2a) and a duct (14) that extends from the hydraulic-connection portion (2a); —at least one elastically deformable body (16), formed with one or more elastically deformable or compressible materials, comprising at least one from among: —a compressible compensation element (20, 21), configured for compensating any possible variations in volume of the fluid; —a sealing element (13, 17); configured for providing a seal with respect to at least one of the housing or supporting structure (2, 3), and the sensor body (5); and—a supporting element (23), configured for supporting or positioning the sensor body (5) with respect to the housing or supporting structure (2, 3). At least one from among the compressible compensation element (16), the sealing element (13, 17) and the supporting element (23) is overmoulded on at least one of the housing or sup porting structure (2, 3) and the sensor body (5).

An example system for non-invasive determination of target properties of a pressure vessel includes: a signal generator acoustically coupled to a fluid contained in the pressure vessel and disposed externally to the pressure vessel, the signal generator to emit acoustic signals into the fluid; a plurality of sensors acoustically coupled to the fluid and disposed externally to the pressure vessel to detect the acoustic signals; a control device interconnected with the signal generator and the plurality of sensors, the control device configured to: control the signal generator to emit acoustic signals into the pressure vessel; obtain sensor data from the plurality of sensors, the sensor data representing the acoustic signals as received by the plurality of sensors; compute, based on the detected signal data, the target properties of the pressure vessel; and output an indication of the target properties.

A pressure sensor including a housing with a sensing element therein. A communication passageway is formed in the housing. The sensing element is in fluid communication with an outside of the housing through the communication passageway. The pressure sensor is further provided with a compensating structure, so that when a contact force is increased due to occurrence of a volume expansion of a liquid passed into the housing through the communication passageway, the compensating structure is used to compensate the volume expansion. A plug may also be used with the pressure sensor. The pressure sensor is such that when the liquid within the pressure sensor has an increased volume due to being frozen, such increased volume can be compensated, so as to prevent the components of the pressure sensor from being damaged.

An industrial process differential pressure sensing device includes a housing having first and second isolation cavities that are respectively sealed by first and second diaphragms, a differential pressure sensor, a static pressure sensor, an eddy current displacement sensor, and a controller. The static pressure sensor is configured to output a static pressure signal that is based on a pressure of fill fluid in the first isolation cavity. The differential pressure sensor is configured to output a differential pressure signal that is indicative a pressure difference between the first and second isolation cavities. The eddy current displacement sensor is configured to output a position signal that is indicative of a position of the first isolation diaphragm relative to the housing. The controller is configured to detect a loss of a seal of the isolation cavity based on the position signal, the static pressure signal and the differential pressure signal.

[Object] Provided are a pressure detection unit and a pressure sensor using the same capable of performing a trimming operation using a simple structure during an assembly operation, and reducing a decrease in detection accuracy of a semiconductor type pressure detection device.

[Solving Means] A pressure detection unit includes a base formed in a lid shape and made of ceramic, a receiving member formed in a plate shape, a diaphragm interposed between the base and the receiving member, a semiconductor type pressure detection device installed on a side of a pressure receiving space formed between the base and the diaphragm in the base, and three terminal pins electrically connected to the semiconductor type pressure detection device, the terminal pins penetrating the base, wherein the three terminal pins include an earth terminal pin, a power input terminal pin, and a signal output terminal pin.

[Object] Provided are a pressure detection unit and a pressure sensor using the same capable of suppressing an increase in manufacturing man-hours due to use of an additional member, and ensuring insulation of a semiconductor type pressure detection device.

[Solving Means] A pressure detection unit includes a base formed in a lid shape and made of ceramic, a receiving member formed in a plate shape, a diaphragm interposed between the base and the receiving member, a semiconductor type pressure detection device installed on a side of a pressure receiving space formed between the base and the diaphragm in the base, and terminal pins electrically connected to the semiconductor type pressure detection device, the terminal pins penetrating the base, wherein a metal layer is provided in a region around the semiconductor type pressure detection device on a surface of the base on the side of the pressure receiving space.

A pressure sensor for an evaporated fuel leak detector is used for checking a leak in a fuel tank and a canister. The pressure sensor includes a sensor unit, a case, and a sealing resin. The sensor unit has a pressure receiving portion, a plurality of conduction terminals, and a mold resin portion. The case is provided with a fluid flow path and a housing recess. The case has an annular inner wall surface that defines the housing recess and surrounds a side surface of the mold resin portion. The inner wall surface of the case is provided with a stepped surface that is parallel to the pressure receiving surface or is inclined by an internal angle of less than 90° with respect to the pressure receiving surface, in a cross section along a direction perpendicular to the pressure receiving surface.

Provided is a pressure sensor for detecting the pressure of liquid flowing in a main flow path, including: an introduction flow path to which liquid is introduced from the main flow path; a pressure detection element having a pressure receiving surface and for detecting the pressure of liquid received by the pressure receiving surface in the introduction flow path; a diaphragm provided in a downstream-side end part of the introduction flow path and for transferring the pressure of the liquid to the pressure receiving surface while isolating a contact between the liquid in the introduction flow path and the pressure receiving surface; and a leak sensor for detecting a leakage of liquid into an internal space in communication with the pressure receiving surface.

A pressure sensing device includes a case provided on a liquid flow path through a liquid, a diaphragm that is provided so as to divide a space in the case into a first space with the liquid flowing therethrough and a second space filled with a gas, a pressure sensor to measure pressure of the gas, and a diaphragm initial position adjustment mechanism capable of adjusting an initial position of the diaphragm to a desired position. The diaphragm initial position adjustment mechanism includes a reciprocating pump that includes a cylinder in communication with the second space, a plunger provided so as to be able to advance and retract within the cylinder, and a plunger driving part to advance and retract the plunger, and adjusts a filling amount of the gas filling the second space by advancing and retreating the plunger in the cylinder by the plunger driving part.