Abstract: A pressure sensor has a stem in which a pressure introduction hole into which a pressure medium is introduced and a diaphragm deformable according to the pressure of the pressure medium are formed, and a strain detecting element which is arranged on the diaphragm via an insulating film and being configured to output a detection signal according to the deformation of the diaphragm. The strain detecting element is configured to have a portion made of polysilicon. A low doping layer having a higher electrical resistivity than polysilicon and a higher crystallinity than the insulating film is arranged between the insulating film and the strain detecting element.

Abstract: A pressure sensor includes a cylindrical case defining an inner space in communication with an outer space; a pressure detector provided in the inner space and configured to detect a gauge pressure of a target fluid; an atmospheric pressure detector configured to detect an atmospheric pressure; and an electronic component configured to calculate an absolute pressure of the target fluid on a basis of the gauge pressure and the atmospheric pressure. The absolute pressure is obtained without requiring airtightness of the case between the inner space and the outer space, and thus, there is no requirement for a seal member to be included between the inner space and the outer space.

Abstract: A pressure detector includes a first board with a first pressure inlet, a first groove, and a first board electrode; a second board with a second pressure inlet, a second groove, and a second board electrode; and a sensing unit arranged therebetween with a diaphragm. The first groove is in communication with the first pressure inlet so as to prevent the formation of a closed space between the first board and the diaphragm when they contact with each other. The second groove is in communication with the second pressure inlet so as to prevent the formation of a closed space between the second board and the diaphragm when they contact each other.

Abstract: A physical quantity measuring device includes a cylindrical case, a cap member, and a sealing member. The cap member covers a circumferential portion of a through-hole of the cylindrical case, while the sealing member provides a seal between the through-hole and the cap member. The cap member is pivotally supported by an attachment target portion of a lid member so that the cap member is rotatable between a first orientation and a second orientation. A cap member engagement portion is insertable into an engagement-portion insertion hole in the first orientation and is engageable with the attachment target portion in the second orientation. A linear member of the sealing member is located, in the first orientation, in a region in a rotation direction from the first orientation to the second orientation. The linear member prevents loss of the cap member and is replaceable, together with the seal member, if damaged.

Abstract: A pressure gauge includes an introduction member, a connection member, a bourdon tube, a pointer, a dial plate, a detector, and an information communication unit. A battery installed in the information communication unit is disposed between a circuit board and a lid. The information communication unit is inserted in a through hole of the dial plate to be disposed astride between a front surface and a rear surface of the dial plate and the lid is disposed on a side of the information communication unit close to the front surface of the dial plate.

Abstract: A physical quantity measuring device includes: a metallic cylindrical case; a sensor module configured to detect a physical quantity; a synthetic-resin joint provided near a first open end of the cylindrical case, the joint being attached with the sensor module and provided with an introduction port for introducing a measurement target fluid; and a cover provided near a second open end of the cylindrical case. The cover includes a locking portion for locking the sensor module. The cylindrical case includes an engagement portion provided near the first open end and engaged with the joint and a crimp portion provided near the second open end, the crimp portion configured to be plastically deformed by crimping. The cover is attached to the cylindrical case by crimping the crimp portion.

Abstract: A sensor assembly includes: a sensor module including a cylindrical portion into which a measurement target fluid is introduced and a diaphragm including a first surface in contact with the measurement target fluid and a second surface provided with a detector; a joint provided with a pressure introduction port for introducing the measurement target fluid to the sensor module; a cylindrical base member surrounding the sensor module; an electronic circuit attached to the base member to receive a detection signal outputted by the detector; and a temperature sensor electrically connected with the electronic circuit. The temperature sensor includes a temperature detector for detecting temperature, and a lead wire electrically connecting the temperature detector and the electronic circuit. The base member is provided with a receiver for receiving the temperature detector and the lead wire.

Abstract: A physical quantity measuring device includes a sensor module; a joint attached with the sensor module; a connector configured to be connected to a first or a second cylindrical case and the joint; a circuit substrate attached with an electronic circuit configured to receive a signal detected by the sensor module; and a holder holding the circuit substrate. The holder can be housed in the first cylindrical case in a first posture where a first end is engaged with a first connector and a second end is in contact with a first cover, or in a second cylindrical case in a second posture where the first end is engaged with a second cover and the second end is in contact with a second connector. The holder has an engaging projection engageable with a first engagement groove provided to the first connector and a second engagement groove provided to the second cover.

Abstract: A physical quantity measuring device includes a cylindrical case provided with a through hole, a sensor module, a joint, a cap member, a circuit board including an electronic circuit and an electronic adjuster, a sealing member attached to the through hole, and an adjuster member capable of adjusting the electronic adjuster. The electronic adjuster includes an engaged portion disposed to face the through hole. The sealing member is provided with a housing recess opened to an outside of the cylindrical case, and a communication hole for bringing the housing recess into communication with an interior of the cylindrical case. The adjuster member includes a shaft that is hermetically attached in the communication hole, an engagement portion provided at a first end of the shaft to be engageable with the engaged portion, and an operable portion provided at a second end of the shaft and housed in the housing recess.

Abstract: A physical quantity measuring device includes a cylindrical case provided with a through hole, a sensor module, a joint, a cap member, a circuit board including an electronic circuit and an electronic adjuster, a sealing member attached to the through hole, and an adjuster member capable of adjusting the electronic adjuster. The electronic adjuster includes an engaged portion disposed to face the through hole. The sealing member is provided with a housing recess opened to an outside of the cylindrical case, and a communication hole for bringing the housing recess into communication with an interior of the cylindrical case. The adjuster member includes a shaft that is hermetically attached in the communication hole, an engagement portion provided at a first end of the shaft to be engageable with the engaged portion, and an operable portion provided at a second end of the shaft and housed in the housing recess.

Abstract: A physical-quantity-measuring device includes: an outer-case including a bottom and a cylindrical body; a synthetic-resin-made inner-case provided inside the outer-case; a detector that detects a physical quantity; a terminal base including a terminal for transmitting a signal from the detector outward; a cover covering an opening of the outer-case and being different in hardness from the inner-case; a cable whose first end is connected to the terminal; and a cylindrical-cable-drawing portion drawing a second end of the cable and projecting from a circumferential surface of the outer-case. The inner case includes: a case threaded-portion; and a terminal-base-setting portion on which the terminal base is set. The detector includes: a bottom connector connected to the bottom; and a joint attachable to a target. The cover includes: a cover body covering the terminal-base-setting portion; and a cover threaded-portion provided to the cover body and screwable with the case threaded-portion.

Abstract: A physical quantity measuring device includes: a cylindrical portion having therein an inner space; a first case provided to a first end of the cylindrical portion; a sensor unit housed in the first case; a second case provided to a second end of the cylindrical portion; a circuit portion housed in the second case; a heat insulating portion disposed to face the sensor unit; a sealing portion that defines a hermetic seal between the heat insulating portion and an inner circumferential surface of the cylindrical portion; a first partition member that separates the sensor unit from the inner space at the first end; and a heat-insulative second partition member that is in contact with an opening edge or the inner circumferential surface of the second end and separates the inner space from the circuit portion near the second end.

Abstract: A sensor module and a joint are made of different metal materials. The sensor module includes a first portion located near a diaphragm and a second portion having a large-diameter portion whose diameter is larger than that of the first portion. A step engaged with a peripheral edge of the large-diameter portion is formed on the joint. The large-diameter portion and the joint are mutually bonded through a bonding portion. The bonding portion is bonded by a plastic deformation bonding that is so-called metal flow. A space is defined between the joint and the module body.

Abstract: A controller includes: a communication attachment member configured to be detachably attached to a measuring device body; a second light emitter/receiver provided to a communication attachment member and configured to transmit/receive a signal to/from a first light emitter/receiver of the measuring device body; and a second controller configured to transmit/receive a signal to/from the second light emitter/receiver. An electronic circuit unit, electronic calibration unit, first control unit, signal transmission unit and the first light emitter/receiver are provided inside a housing of the measuring device body. A window is hermetically provided to a plate of the measuring device body. The communication attachment member includes a cover configured to be disposed so that the second light emitter/receiver faces the window and an engagement portion provided to the cover to be engageable with the housing.

Abstract: A pressure sensor includes a pressure sensor element, a joint provided to a target member, and an attachment member that is fitted into the joint through the connection section and connected to the target member. Each of the pressure sensor element and the joint is formed of a material that is not embrittled upon being in contact with a fluid to be measured that embrittles a material, and more rigid than the attachment member. The connection section is subjected to a plastic deformation connection (metal flow). An expensive hydrogen embrittlement resistant material is used for the pressure sensor element and the joint that are brought into contact with the fluid to be measured, and an inexpensive material is used for the attachment member that is not brought into contact with the fluid to be measured, thereby reducing the production cost of the pressure sensor.

Abstract: A physical quantity measuring device includes: a sensor module provided with a diaphragm; a joint to which the sensor module is attached, the joint including a pressure inlet for delivering fluid to be measured to the sensor module. The joint is made of a synthetic resin and includes a joint body and an elastically deformable claw provided to the joint body and configured to lock the sensor module. Since the claw keeps the sensor module to be held by virtue of the elastic force of the claw, a further attachment process such as welding for attaching the sensor module to the joint is unnecessary. Since the joint body and the claw are integrally made of synthetic resin, it is not necessary to separately manufacture the joint body and the claw.

Abstract: A physical quantity measuring sensor includes: a joint having a projection; a ceramic sensor module including a diaphragm and a cylindrical portion integrated with the diaphragm and provided to the projection; and an O-ring interposed between a sensor-module flat portion extending in a direction orthogonal to an axial direction of the cylindrical portion and a joint flat portion extending in a direction orthogonal to an axial direction of the projection.

Abstract: A strain detector includes a strain-causing portion, an insulation film formed on the strain-causing portion, a strain gauge formed on the insulation film and configured to detect the strain generated by the strain-causing portion as electric signals, an electrode connected to the strain gauge, a bonding pad extending from the electrode, a bonding wire connected to the bonding pad, and an insulative resin layer covering the strain gauge without covering the bonding pad and the bonding wire.

Abstract: A device includes: an outer case; an inner case; a cylindrical base having a distal end that penetrates through a cylinder of the outer case to be fixed to the outer case; and a fastener configured to be mounted on the distal end of the base, the fastener including: an exterior configured to be guided by a guide provided to the inner case; a fastener-side engaging portion engageable with the inner case; and a contact peripheral portion configured to be contact with the outer case to prevent the inner case from rotating relative to the outer case.

Abstract: A circuit board including an electronic circuit unit and electronic adjusting units is disposed in a case. A signal transmitting member connected to the circuit board is mounted in a mount hole of a cover member. Operation holes corresponding to a plurality of operable portions of the electronic adjusting units are provided to the cover member. A cap member including a plurality of cap bodies and a connection portion connecting the cap bodies is attached to the cover member to close the operation holes. The operation holes for adjusting the electronic adjusting units are thus covered/uncovered by the simple cap member. The operation holes are reliably waterproofed by the cap member.