Abstract: A pressure gauge includes a housing unit and a membrane which has a periphery secured to an inner wall of the housing unit, so as to define an air chamber under the membrane in the housing unit. The membrane has a central portion which can move upward in the housing unit in response to increase in air pressure of the air chamber. An adjustment rod has an externally threaded portion extending through and engaged threadably within the threaded hole of a guiding member which is secured in the housing unit. A microswitch is installed on a lower end portion of the adjustment rod and is connected electrically to a pressure source which supplies compressed air into an article to be measured by the gauge. The movement of the adjustment rod relative to the guiding member moves the microswitch in the housing unit to a predetermined position which corresponds to a preset upper limit value of air pressure of the air chamber.

Abstract: A modular oil monitor for a gas turbine engine includes a mounting pad having a seat with a plurality of oil inner ports disposed therein and joined in flow communication with an oil tank and an oil sump of the engine. A module having a base is removably fixedly joined to the seat, with the base having a plurality of oil outer ports disposed therein and joined in flow communication with respective ones of the inner ports. The module also includes a filter circuit disposed in flow communication between first and second ones of the outer ports, with the filter circuit including an oil filter removably joined to the module for filtering supply oil channeled therethrough. A first sensor is removably joined to the module for measuring the oil temperature or pressure. The module provides at one location various lubricating system components which may be individually inspected or replaced. Or, the entire module may be replaced in one operation.

Abstract: Pickup coils which generate vehicle wheel speed signals which include vibration frequency components of tires during vehicle cruising are provided. An electronic control unit extracts resonance frequencies of tires from the vehicle wheel speed signals and estimates tire pneumatic pressure based on the extracted resonance frequencies. When an estimated vehicle wheel pneumatic pressure falls below a predetermined critical pneumatic pressure, pneumatic pressure decline warnings are generated and displayed by a display unit. An update switch is provided and when this update switch is turned on when replacing tires, the electronic control unit adjusts and sets the value of the critical pneumatic pressure described above based on the resonance frequency extracted during this time.

Abstract: A tire pressure monitoring device includes a pressure gauge pivotably mounted to a base which can be attached to a tire valve stem. The pressure gauge includes a ring-shaped piston and spring mounted in a transparent sleeve. Other embodiments use an electronic pressure sensor to generate a digital pressure display. Optionally the device may include a transmitter to provide pressure data to a display in the interior of a motor vehicle.

Abstract: A differential pressure detecting apparatus includes a columnar main body wherein a differential pressure detection portion is inserted into a closed-end hole having a countersunk portion and formed in the outer circumferential surface of said main body at right angles to the axis of the main body, wherein a first seal diaphragm for receiving one of introduced pressures relating to a differential pressure to be measured is provided in one end surface of the main body, and wherein the main body has a hole provided for transmitting the received introduced pressure to the differential pressure detection portion; a disc-like sub-body inserted into the countersunk portion of the closed-end hole, wherein a second seal diaphragm for receiving the other introduced pressure is provided in the outer end surface of the sub-body, and wherein a hole is provided for transmitting the received introduced pressure to the differential pressure detection portion; a cover provided on the one end surface of the main body, and hav

Abstract: A sensor (44) having all electrical connection formed on one of the sensor's sides. A first substrate (10) operably attached to a second substrate (32) where the second substrate includes at least one feedthrough hole (22). A first electrical connection (36) is formed on the first substrate (10) through the feedthrough hole (22). A second electrical connection (38) is formed on the second substrate (32) such that the first and second electrical connections (36, 38) are formed on the same side of the sensor (44). An electrical insulator (26) is disposed between the second substrate (32) and the first electrical connection (36) to electrically isolate the first electrical connection (36) from the second substrate (32).

Abstract: A vertically integrated sensor structure (60) includes a base substrate (71) and a cap substrate (72) bonded to the base substrate (71). The base substrate (71) includes a transducer (78) for sensing an environmental condition. The cap substrate (72) includes electronic devices (92) formed on one surface to process output signals from the transducer (78). The sensor structure (60) provides an integrated structure that isolates sensitive components from harsh environments.

Abstract: Fluid flow characteristics are calculated directly from a two dimensional rface model of the object. A plurality of surface nodes with defined boundary conditions are established on the surface model. Consecutive layers of nodes are created a preset distance outward from said surface model. Curved panels are defined passing through three nodes at a layer, and a surface shape function is established for each panel from previous panels or from the boundary conditions. The fluid flow velocity for the next layer is developed from the velocities calculated at the previous layer and the shape function. Triangular elements are created by connecting a node on the next layer with two nodes from the previous layer to form an element. First and second vorticity gradients can be calculated for the current node at a time segment from the parameters associated with the previous layer of interest nodes at that time increment.

Abstract: A speed measuring system for a jet-propelled watercraft which includes a pitot tube mounted within the jet intake chamber of the watercraft for measuring the dynamic water pressure therewithin. The pitot tube is linked via flexible tubing to a pressure port in the dashboard of the watercraft, which is fitted with an electronic pressure sensor. The output of the electronic pressure sensor is amplified and input to an analog-to-digital converter, where the digital data is then input to a microprocessor for calculation of the actual water speed as a function of the dynamic water pressure measured within the jet intake chamber of the watercraft. A variable linear scaling factor is applied to the digital pressure signal over different ranges of such signals to compensate for nonlinearities that are introduced in the dynamic water pressure within the intake chamber.

Abstract: A pressure transmitter comprises a first housing having a first and second diaphragm for receiving a first and second process fluid under a first and second pressure, respectively. The first and second diaphragm is deflected in response to the first and second pressure of the process fluid. A second housing includes a printed wire board. A first and second capillary tube is included, the first capillary tube being operatively coupled to the first diaphragm and the second capillary tube being operatively coupled to the second diaphragm, each corresponding capillary tube having an internal fluid therein. A sensor package, having a sensor element, is mounted internally within the second housing, and is coupled to the first and second capillary tubes such that the sensor element provides a first signal which is coupled to electrical circuit components mounted on the printed wire board to output a signal representative of the differential pressure of the process fluid.

Abstract: Device for compensating pressure differences between the inside and the outside of an insulating glass frame, including a closed cylindrical hollow body which is arranged, so that its axis is not horizontal, between the inside and the outside of an insulating glass frame. A ball is movable within the body and has such a diameter as to be in contact with the wall, so as to fully separate the inside into two regions. At least one first hole for connection to the outside/inside is located in a suitable wall portion affected by the passage of the ball, and at least one second hole for connection to the inside/outside is located on the bottom.

Abstract: An apparatus (20) for sensing pressure in a stiff wall sealed vessel (30) comprises a piezoelectric transducer (200) operatively coupled to the vessel (30) for transferring energy to pressurized fluid in the vessel (30). A piezoelectric sensor (202) is operatively coupled to the vessel (30) for providing a received electrical signal having a frequency value indicative of the oscillation frequency of the pressurized fluid. A receiver circuit (224, 226, 228) is operatively connected to the sensor (202) and provides a fluid resonating signal having a frequency indicative of the fluid pressure in the vessel (30). A drive circuit (230) is operatively connected to the receiver circuit (224, 226, 228) and to the piezoelectric transducer (200). The drive circuit (230) initially drives the piezoelectric transducer (206) with noise.

Abstract: In a pressure sensor with a housing containing a measuring device which is separated from the housing by a radial gap and comprises a pressure transmitting element, a measuring element, and, if required, a tubular spring for axially preloading the measuring element, and with a sealing membrane tightly and flexibly connecting housing and pressure transmitting element on the side of the medium, the proposal is put forward that at least one heat conducting element be provided between the pressure transmitting element and the housing, which element should be made from material of good thermal conductivity and have a large cross-section for heat conduction, such that most of the heat arising in the region of the pressure transmitting element is carried off to the housing via the heat conducting element, the latter acting as bending or rolling element in the instance of axial shifts between the pressure transmitting element and the housing, and being flexible in axial direction to minimize the transmission of force

Abstract: The invention is a system for determining the physical characteristics of an incident fluid flow stream over a surface of a vehicle relative to an axis thereof, the apparatus. In detail, the invention includes at least one first pressure sensor mounted on the surface, the at least one first pressure sensor for receiving dynamic pressure signals generated by the convected boundary layer of the fluid flow stream and providing an output signal representative thereof. At least one array of second pressure sensors (pressure transducers) is positioned down stream of the at least one first pressure sensors, the second sensors of the at least one array each of said second pressure sensors providing a second output signal representative of the above pressure signals received thereby. A computer system is adapted to receive the first and second signals and to calculate the angular direction of the fluid flow relative to the axis and the velocity thereof.

Abstract: In a measurement system for a pressure gage which has a bourdon tube spring as well as a spring support, the bourdon tube spring is made of a metallic material and the spring support is made of a polymer plastic. The connection between the bourdon tube spring and the spring support is made by means of a metallic transition element which has a recess into which the fixed end of the bourdon tube spring is glued or soldered, and which has engagement means formed on it which are in form-fitting engagement with the spring support. The compound assembly comprising the transition element and the spring support combines the cost advantage of the fabrication of the spring support from plastic with the mechanical advantages and antileak advantages of a metal-to-metal connection for the connection of the bourdon tube spring to the spring support.

Abstract: A seal diaphragm structure for a pressure measuring device includes a seal diaphragm, an insulating film, and an p-type semiconductor film. The seal diaphragm has a first surface opposing a target fluid and a second surface contacting a pressure transfer sealed liquid sealed in the pressure measuring device. The insulating film is formed on the first surface of the seal diaphragm. The p-type semiconductor film is formed on the insulating film.

Abstract: A tire pressure gage consisting of a detecting head, a cylindrical casing, an inner tube, and a pressure measuring scale, a pressure setting scale, an inner tube locating cap, a fine adjustment screw, a pressure spring, and a bottom cap, wherein the spring force of the pressure spring can be adjusted by the fine adjustment screw so that the pressure measuring scale can accurately indicate the tire pressure; the pressure setting scale can be set subject to the desired tire pressure so that the T-shaped piston can automatically open the longitudinal center through hole of the pressure measuring scale for permitting excessive tire pressure to be drawn away.

Abstract: A differential pressure transducer is provided in which first and second diaphragms are formed within a block of material, such as monocrystalline silicon. Each diaphragm carries a support for a bridge. The supports are offset from the center of the diaphragms such that deflection of the diaphragms imparts a degree of lateral motion to the respective support. The bridge is held within an evacuated cavity and the resonant frequency of the bridge is a function of the difference in pressure action of the diaphragms.

Abstract: In a method of manufacturing frame-mounted membranes, a first membrane layer is formed on a substrate and openings are formed in this membrane layer which are then covered by a second membrane layer, a frame structure is formed on the membrane layers around the openings and the membrane layers with the frame structure are separated from the substrate to provide the frame-mounted membranes.

Abstract: A fluid velocity meter having an elongate body defining a flow opening therein bounded by an inner top wall, inner bottom wall, and a pair of side walls with the flow opening extending completely through the elongate body to allow a stream of fluid to pass through the flow opening. A vortex-generating element is provided within the flow opening to direct vortices to impinge on the inner top and bottom walls in an alternate fashion. First and second sensors are disposed within the elongate body and positioned adjacent to the inner top and bottom walls. Output means are provided for generating a signal indicative of the force supplied to each sensor, and thus the velocity of the flowing fluid can be determined.