Abstract: In a multiple function type differential pressure sensor including a semiconductor chip having a differential pressure detector for detecting a differential pressure, temperature detector for detecting a temperature, and static pressure detector for detecting a static pressure provided on a semiconductor substrate of a single chip, two or more pairs of differential pressure detectors means are incorporated, and a difference between outputs of the two or more pairs of differential pressure detectors is fetched out.

Abstract: A pressure transducer having a redundant fluid pressure sensor can be used to determine if the pressure transducer needs to be recalibrated. The pressure transducer comprises a fluid pressure sensor for measuring differential pressure. The fluid pressure sensor includes a pair of substantially identical pressure sensors for providing a variable electrical output as a function of a differential fluid pressure and a reference sensor for providing an electrical output independent of the differential fluid pressure. A conditioning circuit is provided for generating a frequency-based signal whose frequency is a function of the electrical output for each fluid pressure sensor. The electrical output of the first and second pressure sensors can be compared to determine whether the pressure transducer needs to be calibrated. In one embodiment, the pressure sensors comprise variable capacitors.

Abstract: A low pressure sensing device for sensing pressure changes in a pressurized gas storage bottle of an inflater. At least one wire is wrapped around the vessel to sense the expansion or contraction of the vessel due to pressure changes in the vessel. The wire has a first end and a second end. The first end of the wire is secured to the vessel and the remainder of the wire is free to move circumferentially relative to the vessel in response to the expansion and contraction of the vessel. This relative movement can be monitored to determine if a pressure change has occurred in the vessel.

Abstract: A transmitter of the type used in the process control industry includes a sensor for sensing a process variable and a transmitter body having a sensor coupling. A sensor extension couples to the sensor coupling and includes a sensor coupling face. A first flange interface has a process face which provides a process connection and a sensor face which provides a sensor connection. A passageway couples the process connection to the sensor connection. The first flange interface is coupled to the sensor extension by a coupling mechanism. The sensor extension and the first flange interface may be moved throughout, a range of positions relative to one another.

Abstract: The described tire deflation device is used when it is necessary to deflate a tire rapidly, especially when the tire is not to be fully deflated. A tool within the device is able to engage the tire valve in order to unscrew it from the valve stem. The tire valve stem is engaged, by a housing wall within which the tool slides. The tool is manipulated at a free proximal end of the housing wall and is able to rotate and slide longitudinally within the housing wall. The tool includes a seal which prevents tire air from reaching an aperture in the housing wall when the tool is at one end of the housing wall, and uncovers the aperture when positioned at the other. In one embodiment, a collar, engagable with a pressure gauge, slides on the outside of the housing wall and is able to be positioned so that the aperture and pressure gauge are interconnected, and alternately positioned to vent the tire.

Abstract: The present invention relates to a method and system for monitoring a parameter of a vehicle tire. In one embodiment, a detector unit disposed within the tire communicates with a central receiver unit over an electromagnetic path comprising one or more conductive components of the vehicle. Other embodiments of the invention include additional communications links for receiving information from and controlling the detector unit and the receiver.

Abstract: A monolithic temperature and pressure transducer having a plurality of capacitive sensors. The capacitors are formed from the same silicon substrate and are equally affected by temperature variations, including temperature gradients.

Abstract: A force sensor assembly incorporates an integrated plunger to provide an economical assembly which can be calibrated and mounted as a single unit. The force sensor assembly utilizes a retainer to movably capture a solid interface within an opening in the retainer. The solid interface includes a flange positioned within the assembly below the retainer opening. The flange dimensions are greater than the retainer opening to retain the solid interface within the assembly. The retainer is attached to a housing body having a gel filled cavity underlying the retainer opening. A diaphragm free floats on the gel within the housing body and contacts the solid interface. The gel transmits a force exerted on the diaphragm from the solid interface to a pressure sensor mounted at the base of the housing body cavity. A ceramic substrate having an integrated resistor network supports the pressure sensor and an amplifier.

Abstract: A selectively pressured housing apparatus comprising a body, a wall member, an aperture, and a mounting seat. The body has a chamber therein extending along a first axis, is open at a first axial end and a second axial end, and has a port extending along a second axis transverse to the first axis. The port communicates with the chamber. The wall member is inside of the body and extends transverse to the first axis and parallel to the second axis and divides the chamber into first and second compartments, axially spaced along the first axis. The port communicating with the chamber is in the second compartment. The aperture extends through the wall member and connects the first and second compartments. The mounting seat is on the wall member and extends circumferentially about the aperture for removably and replaceably seating an element with a selected pressure seal to the wall member.

Abstract: A self-exciting vibratory device for producing vibration signals in a housing includes actuator means (12) attached to housing (16), sensor means (14) attached to housing (16) and electronics module (18) connecting actuator means (12) and sensor means (14). Actuator means (12) creates vibration signals within housing (16). Sensor means (14) senses the vibration signals created by actuator means (12). Electronics module (18) amplifies and phase shifts the vibration signals sensed by sensor means (14) and containing resonant modes of vibration of housing (16). Electronics module (18) then supplies these amplified, phase shifted signals to actuator means (12) to enhance the vibration of housing (16) at the dominant mode of vibration of housing (16).

Abstract: A method for controlling transverse profiles of a web in a web-manufacturing machine, such as a board or paper machine, and/or being treated in a finishing machine. At least one of a transverse caliper, grammage and moisture profiles of the web is measured either directly or indirectly. Actuators acting upon these profiles are regulated by measurement signals. In order to optimize the quality of the web to be produced, the reel formation, and the runnability of the machine, the transverse tension profile of the web to be manufactured and/or treated is measured. Based on the measurement of the transverse tension profile, set profiles are formed which control the actuator(s) of the profile regulation.

Abstract: A pressure sensor for connection to a circuit board includes a silicon chip arranged in a housing so that one surface of the silicon chip faces the circuit board, and pressure is applied on the silicon chip surface facing away from the circuit board. The pressure sensor configuration is easy to produce and allows simple installation of the pressure sensor on the circuit board.

Abstract: The distribution of a specific pressure in the ground-contacting area of a tire (4) under examination is detected by means of a plurality of sensing cells (7) distributed on a plate-like support (8) applied to a rest surface (2) acted upon by the tire through its rolling surface (5). Each sensing cell (7) sends an electric signal correlated with the specific pressure applied thereto to a processing unit (10) through which the processed signals are sent to a display device (12) graphically representing the distribution of the specific pressure in the ground-contacting area. By causing the tire (4) to roll on the rest surface (2) and therefore the sensing cells (7), the dynamic variation of the specific pressures in the ground-contacting area can be detected. A protection sheet (11) interposed between the rolling surface of the tire (4) and the sensing cells (7) protects the latter against risks of damages due to tangential shearing stresses produced at the ground-contacting area.

Abstract: A contamination gauge for paper manufacturing for detecting the debris on paper includes a hand-held housing having a gripping surface and a plunger carried axially by the housing having a pressure application surface disposed on one end of the plunger for applying a predetermined force. A force exerting element is carried within the interior of the housing for exerting the predetermined pressure when the housing is moved relative to the plunger. An indicator indicates when the housing has moved sufficiently for generating the predetermined amount of pressure. Also a method for testing the propensity of paper rolls to lint debris on printing machines is disclosed.

Abstract: A digital tire gauge adapted to be electrically connected to a power supply for measuring a pressure of a fluid in a tire includes, a transducing oscillator mounted in a gauge housing for transducing an imposed pressure of said fluid into a signal of a periodic sequence of cycles, and including a pressure sensor having at least one resistor having a resistance thereof which changes with imposed pressure, a capacitor electrically connected to the pressure sensor for forming therewith an oscillating circuit; and a plurality of inverters electrically connected to the capacitor and pressure sensor to provide a gain for the transducing oscillator, an isolating inverter electrically connected to the transducing oscillator, and functioning as a buffer for impedance matching of the transducing oscillator, a processor electrically connected to the buffer for generating a numerical value in response to a signal from said buffer, a display electrically connected to the processor for displaying a digital reading in accor

Abstract: A semiconductor pressure sensor that can be inexpensively manufactured with a reduced number of assembly steps and without using spacers includes a stem having an upper surface on which are mounted a pedestal and a semiconductor pressure sensor chip of substantially the same area as that of the stem upper surface. The semiconductor pressure sensor chip and the pedestal include aligned lead insertion holes through which leads are inserted. While spacers have been used in the prior art to reduce vacant space in the sensor that is filled with silicone oil, the spacers can be dispensed with in the invention because the semiconductor pressure sensor chip and the pedestal have areas substantially the same as the stem upper surface and serve as spacers.

Abstract: A process for correcting differential pressure signals which takes into account the disturbance variables, temperature and static pressure, that influence the absolute pressure and thereby reduce the accuracy of the corrected differential pressure signals. A corrected differential pressure signal is recursively calculated from a measured differential pressure signal, a measured absolute-pressure signal and a temperature signal in combination with a plurality of lower degree correction polynomials. The corrected differential pressure signal may be further processed via a linearization polynomial to produce a linearization correction signal which, when combined with the corrected differential pressure signal, produces a linearization differential pressure signal. Recursivity in the calculation of the corrected differential pressure signal links residual errors into the correction process despite the use of relative simple lower degree correction polynomials.

Abstract: Apparatus for measuring the pressure of a fluid includes a first pressure transmission element in form of a membrane in contact with a pressure sensor, and a second pressure transmission element in form of a membrane which is acted upon by a fluid whose pressure is to be determined. The first membrane has a peripheral area which is pressed against the second membrane in such a manner that the space between the first and second membranes is sealed off from outside and is of a size as small as possible. Both membranes thus move in synchronism in dependence of the fluid pressure so that positive as well as negative pressures can be measured.

Abstract: The air pressure gauge tool of the present invention provides an air gauge capable of accessing, loosening, removing, retaining, and reinstalling tire valve dust-caps as well as measuring tire pressure. A tire valve dust-cap engaging receptacle is attached to a conventional tire pressure gauge of the type having a cylindrical body. The dust-cap engaging receptacle is comprised of a socket-type cylindrical receptacle, with an open top end and parallel splines lining its internal circumference, for receiving and engaging a tire valve dust-cap.

Abstract: The invention relates to an adaptor for mounting a pressure sensor for a high temperature system comprising a sensor carrier means with an axis of elongation, said carrier means being provided at one axial end thereof with mounting means for sealingly mounting said carrier means in a hole of the wall, with an end face of said carrier means within said borescope hole being provided with an opening for entrance of pressure fluid from the interior of the gas tubine wall into said carrier means, said carrier means further being provided at the other axial end thereof with a recess for sealingly receiving the pressure sensor.