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6868720 Testing of pressure sensor in surgical cassette  
A method of determining the accuracy of a pressure sensor in a surgical cassette is disclosed. The method involves displacing a diaphragm of the sensor a pre-defined amount of displacement, and...
6412349 Force balancing capacitance manometer  
An apparatus for measuring the differential pressure between at least two fluids including (a) first and second pressure enclosures; (b) first and second pressure deformable members where the first...
6407664 System and method for monitoring vehicle  
Determination is made as to whether or not a self-diagnostic tester 13 is connected with a K line 14 . When the result of the determination indicates that the self-diagnostic tester 13 is not...
5515711 Pressure measurement and calibration apparatus using gravity-induced diaphragm deflection  
A pressure measurement and calibration apparatus for accurately detecting fluid pressures in the range of between approximately 0 and 1000 millitorr, and more particularly in the range of between 0...
5343753 Device for detecting a variation in a pressure being monitored by sensing displacement of a ball in a tube  
A detector tube is supplied with air at an adjustable pressure balanced by at least two adjustable leak flow rates in the conduits 4 and 7 in order to adjust the position of ball in the tube. The...
5317948 Pressure transducer using permanent magnet and opposing variable magnetic field  
An electromagnetic fluid pressure transducer is provided which uses the opposing magnetic fields of a permanent magnet and an electromagnet to sense a change in a differential force. The...
5103682 Ultra-sensitive force detector employing servo-stabilized tunneling junction  
A highly sensitive force detector using a tunneling junction as a strain gauge is disclosed. The tunneling junction is connected to a deflection member which receives the force to be measured. The...
5005408 Gas weights compensation method for liquid depth gauging system  
A method and apparatus for monitoring liquid levels using pressure responsive instruments is described, in which an arrangement for compensating for the effects of errors including gas weights...
4856338 Technique for null balancing fluidic circuits  
A null balanced fluidic sensing system that is less susceptible to pressure upply disturbances includes sensing and amplifying elements in a closed loop arrangement. The differential output of the...
4739664 Absolute fluid pressure sensor  
A pressure sensor uses two fluidically coupled piezoelectrically driven, vibrating cantilever structures, each tuned to the same fundamental resonance frequency. One cantilever, the driver, is...
4724709 Pressure measuring system with internal reference  
A pressure measuring system which includes a pressure sensitive capacitor and a reference capacitor, a source of external excitation connected to the sensing capacitor, the reference capacitor...
4682499 Pressure transmitter  
An improved pressure transmitter having a body with signal pressure responsive means and output pressure means having pressure responsive means, a supply of fluid pressure to said output pressure...
4669317 Devices for the very accurate measurement of fluid pressures  
A device is provided for the very accurate measurement of fluid pressures, comprising a vertical cylinder (2), a piston (1) adapted for sliding in this cylinder with viscous friction, the pressure...
4665747 Flight instrument using light interference for pressure sensing  
Aircraft instrument for indicating air pressure, air pressure rate of change and accelerations of the aircraft movement based on the use of an optical laser interferometer. The air pressure is...
4662213 Back pressured pneumatic pressure cell  
An improved back-pressured pneumatic pressure cell is provided along with a method of using the same. The device includes at least one sensing cell mounted on a blade for insertion into the soil....
4614118 Non-compliant pressure cell  
The present invention is a pressure sensing and measurement device that eliminates errors due to compliance and lack of sensitivity. The cell uses a pressure receiving means (such as a flexible...
4604898 Pressure measuring device  
A device is provided comprising a circuit using the properties of a resonating cavity sensor whose resonance frequency is modified by the electric capacity variations due to the mechanical...
4586388 Three force balanced mechanism  
In a three force balanced mechanism comprising a floating pivot, an input force transmitting member, a feedback force transmitting member, one end of the input force transmitting member and one end...
4570490 Differential pressure ratio measurement system  
A pressure ratio measuring system is disclosed. The system includes two quartz capacitive pressure transducers (16, 22). Each capsule contains a pressure sensitive capacitor (Csa, Csf) which is fed...
4546785 Pressure translator and system for measuring pressure  
A pressure translator for converting a process pressure into a pneumatic signal which can be transmitted and measured by a pressure measurement device at a remote location. The pressure translator...
4546651 Transducer coupling  
A circuit for coupling a transducer having a reactive sensing element to equipment providing either AC or DC drive voltage and equipped with strain gauge amplifiers in which the sensing impedance...
4532809 Pressure measuring systems with increased accuracy for a constant resolution  
A pressure parameter measurement system includes a parameter measurement loop (24, 16, 26, 28, 30, 32, 34) generating a digital signal (N1) indicative of a parameter (Pa-Pb) being measured, a...
4517842 Fluid pressure transducer  
A fluid pressure transducer of the null balance type in which a fluid whose pressure is being sensed acts against one face of a diaphragm and a balancing control fluid acts against the opposite...
4502333 Three force balanced mechanism  
In a three force balanced mechanism of the type comprising a floating pivot, an input force transmitting member, a feedback force transmitting member, one end of these members being connected to...
4489613 Transmitting device for measuring the operating pressure in a system  
A device for sensing and monitoring the pressure variations of a pressurized fluid in a duct (13), comprises an upper body (1) coupled to a pressurized air source (5) and a lower body (2) which is...
4457179 Differential pressure measuring system  
A differential pressure measuring system is disclosed. The system includes two quartz capacitive pressure transducers (14, 16). Each capsule contains a pressure sensitive capacitor (Csa, Csb) and a...
4434664 Pressure ratio measurement system  
A pressure ratio measuring system is disclosed. The system includes two quartz capacitive pressure transducers (16, 22). Each capsule contains a pressure sensitive capacitor (Csa, Csf) which is fed...
4431985 Stepper motor system for digitally measuring input quantities  
A digital system for measuring an input quantity includes an input mechanism for providing a first input in response to an input quantity to be measured, a stepper motor for providing a second...
4430900 Pressure responsive switching device particularly pressostat or thermostat  
A pressure responsive switching device, particularly a pressostat or thermostat, comprises an actuating element (5) which is loaded in one direction by an operating element (1) at the pressure and...
4422335 Pressure transducer  
A pressure transducer (26) is disclosed. A multiplicity of signal plates (Cs, Cr, Csf, Crf) are disposed on a first quartz disc (88). Opposing the signal plates (Cs, Cr, Csf, Crf) across a gap...
4413634 Low volume change detection  
Low volume flow measurement apparatus developed for hearing dysfunction diagnosis but also suited to other applications comprises means (10) defining a cavity operably communicable with the...
4413523 System for dampening pulsations or oscillations in a force-balance instrument  
A force-balance pressure measuring instrument incorporates a fluid pressure couple. The couple constructively includes a fulcrumed beam. The primary element is connected to the force-balance beam...
4403512 Servo-type capsule-equipped instrument  
A servo instrument, particularly a servo altimeter, with a minimum of display error. The instrument comprises a capsule assembly, a sector adapted for rotation corresponding to the displacement of...
4393713 Digital pressure-measuring device  
The pressure-measuring device comprises a first chamber subjected to the pressure to be measured and a second chamber connected to the first through an opening fitted with a valve. The device...
4381677 Reactance measurement circuit  
A circuit for measuring the reactance of an AC reactance sensor which varies responsive to a condition to be sensed, such as pressure, is disclosed. The circuit comprises an oscillator coupled to...
4378809 Audio-telemetric pressure sensing systems and methods  
A differential pressure sensing device is fully implanted beneath the skin in the living body such that its pressure responsive means, such as a diaphragm means, senses the difference in pressure...
4322977 Pressure measuring system  
A digital pressure measuring system with nonlinear resolution is disclosed. The system includes a capacitive pressure transducer with a pressure variable sensing capacitor and a substantially...
4289034 Device for converting pneumatic or hydraulic pressure into an electric current and vice versa  
A device for converting a pneumatic or hydraulic pressure into an electrical current and vice versa according to the compensation principle, with a pressure transducer with a pressure-dependent...
4277981 Lead screw actuated fluid gauge  
A balance beam has a fulcrum, at least one bellows (connected to a source of pressure or vacuum) acting on the beam and a connection to the armature of a differential transformer at one end. A...
4266430 Precision pressure-responsive fluid gauge  
A balance beam has a fulcrum, at least one bellows (connected to the source of pressure or vacuum) acting on the beam at a point along its length and a connection to the armature of a differential...
4206762 Telemetric differential pressure sensing method  
A differential pressure sensing device is fully implanted in the body of a patient to monitor internal pressure such as intracranial pressure. A movable element in the sensor communicates with the...
4197743 Apparatus for measuring barometric pressure  
Apparatus for measuring barometric pressure comprising a housing made of high thermal conductivity metal and defining a cavity therein, a diaphragm of flexible spring type material clamped in...
4193307 Apparatus for indicating subsea well head pressure  
An apparatus for indicating at the surface, the subsea well head pressure including; a reservoir, a subsea hydraulic transmitter, a pump to pump hydraulic fluid from reservoir to the subsea...
4192191 Pressure sensor  
A mechanical and electrical pressure sensor wherein the mechanical part includes a fluid pressure chamber with a magnetic, electrically conductive diaphragm moving out-of-contact with a stationary...
4128013 Pressure transducer  
This invention relates to a pressure transducer adapted to transduce or convert fluid pressure into air pressure on a one-to-one basis for control or indication purposes. The transducer includes a...
4117724 Ambient pressure sensor  
An ambient pressure sensor generates an electrical signal which varies in response to changes in ambient pressure level. The sensor includes a sealed bellows or aneroid which varies in length as...
4077262 Slaved pressure transducer  
Servo pressure pickup comprising a sealed housing having a pressure inlet and in which is mounted an anaroid capsule one wall of which is mechanically linked to an electrical displacement measuring...
3915009 Precision pressure gauge  
A force-balance, precision pressure gauge employing a fused quartz, helical, bourdon tube to transduce pressure into rotary motion, a fixed optical system to detect such rotary motion, and a...
3884079 Force balance differential pressure transmitter  
A differential pressure transmitter, including a gauge, which embodies a novel form of force-balance system that eliminates the need for levers, pivots and critical flexures. The system is designed...
3878725 Cross-flexure pivot for electronic differential pressure transmitter  
An electronic differential pressure transmitter for use with industrial processes to produce an output signal suitable for transmission to a remote station for operating, indicating, recording or...
Matches 1 - 50 out of 159 1 2 3 4 >