A pressure sensor outputting an electrical signal upon a fluid pressure in a target space includes a diaphragm having a pressure receiving surface disposed in the target space for receiving a fluid pressure, and a back surface on a back side of the pressure receiving surface, an inner member disposed to face the back surface and a diaphragm supporting portion connected to the diaphragm. The diaphragm includes a center portion disposed to face the inner member and is distorted as a concave shape toward the detecting direction because of the heat transmitted to the pressure receiving surface and the distortion of the center portion as a concave shape toward the detecting direction. A contacting portion provided on a connecting portion between the center portion and the outside portion is in contact with the inner member.

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 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 microfabricated pressure transducer is formed in a multilayer substrate by etching a plurality of shallow and deep wells into the layers, and then joining these wells with voids formed by anisotropic etching. The voids define a flexible membrane over the substrate which deforms when a force is applied.

Embodiments provide a fluid detection device including a casing connectable to a tube filled with water and allows the water to flow to a hollow inner part; a partition wall deformable so that the hollow inner part is divided into a fluid chamber filled with the water and an air chamber opened to the atmosphere; a slide tip disposed inside the fluid chamber; and a tip sensor disposed outside the casing. According to at least one embodiment, a slide holding part which holds the slide tip slidably forward and backward is formed inside the fluid chamber, an opening part is formed in the air chamber, a magnet is disposed in the casing, the slide tip includes a magnet provided at a position facing the magnet and repelling the magnet.

A resonant pressure sensor includes a first substrate including a diaphragm and at least one projection disposed on the diaphragm, and at least one resonator disposed in the first substrate, at least 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.

Provided is a pressure detection device including: a pressure detection unit; a flow passage unit; and a mounting unit configured to removably mount the flow passage unit on the pressure detection unit. The pressure detection unit has a pressure detecting diaphragm and a sensor rod arranged at the center part of a first surface of the pressure detecting diaphragm, protruding toward the flow passage unit along a first axis orthogonal to the pressure detecting diaphragm, and having a top surface orthogonal to the first axis. The flow passage unit has a flow passage diaphragm, and a displacement of the flow passage diaphragm in contact with the top surface is transmitted to the pressure detecting diaphragm via the sensor rod in a state where the flow passage unit is mounted on the pressure detection unit by the mounting unit.

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 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. By comparison of the measurements at the two strain gauges, it is possible to determine a wall thickness by determining a strain of the pipeline owing to a decrease in the wall thickness.

Provided is a pressure detection device that can suppress variation in the pressure detection characteristics of a pressure detection unit from occurring due to individual differences in the shape of flow passage units, variation in work in mounting the flow passage unit on the pressure detection unit, or the like. The pressure detection device including: a pressure detection unit; a flow passage unit; and a mounting unit configured to removably mount the flow passage unit on the pressure detection unit. The pressure detection unit has a pressure detecting diaphragm and a sensor rod arranged at the center part of a first surface of the pressure detecting diaphragm. The flow passage unit has a flow passage diaphragm, and a displacement of the flow passage diaphragm in contact with the top surface is transmitted to the pressure detecting diaphragm via the sensor rod.