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| Number | Title | Issue Date |
| 7188528 | Low pass filter semiconductor structures for use in transducers for measuring low dynamic pressures in the presence of high static pressures A semiconductor filter is provided to operate in conjunction with a differential pressure transducer. The filter receives a high and very low frequency static pressure attendant with a high frequency low dynamic pressure at one end, the filter operates to filter sai... | 03/13/2007 |
| 7107853 | Pressure transducer for measuring low dynamic pressures in the presence of high static pressures A sensor is described, which basically consists of a leadless high sensitivity differential transducer chip which responds to both static and dynamic pressure. Located on the transducer are two sensors. One sensor has a thicker diaphragm and responds to both static ... | 09/19/2006 |
| 5750903 | Method of linearizing a flow velocity sensor, a linearized flow velocity measurement apparatus and system The invention relates to a method and apparatus for linearizing a flow velocity sensor based on pressure difference measurement. According to the method, a difference of two pressure signals is measured from the flow under measurement and is proportional ... | 05/12/1998 |
| 5563353 | Software nullification of transducer induced offset errors within a flow rate measurement system Fluid flow in a conduit is measured by placing a flow block in the conduit which introduces variations in the flowpath which cause local pressure variations. The pressure variations are converted to electrical signals by transducers, and the electrical si... | 10/08/1996 |
| 5115684 | Flowmeter for measuring the rate of fluid flow in a conduit The flowmeter includes a piston that is biased by a spring to a neutral position within an encircling collar, and the piston is movable relative to the collar by and in the direction of the fluid flow to be measured. Movement of the piston relative to the... | 05/26/1992 |
| 4996886 | Differential pressure transmitter and a square root extracting device therefor A differential pressure transmitter, a pneumatically operated square root extracting device therefor and methods of making the same are provided, the transmitter having a rod operatively interconnecting a movable wall with a cam roller to cause the roller... | 03/05/1991 |
| 4996885 | Differential pressure transmitter, a square root extractor A differential pressure transmitter, a pneumatically operated square root extracting device therefor and methods of making the same are provided, the transmitter comprising a unit for producing an output pneumatic signal from a pneumatic source in relatio... | 03/05/1991 |
| 4926697 | Differential pressure transmitter, a square root extracting device therefor and methods of making the same A differential pressure transmitter, a pneumatically operated square root extracting device therefor and methods of making the same are provided, the transmitter having a rod operatively interconnecting a movable wall with a cam roller to cause the roller... | 05/22/1990 |
| 4922760 | Differential pressure transmitter, a square root extractor device therefor and methods of making the same A differential pressure transmitter, a pneumatically operated square root extracting device therefor and methods of making the same are provided, the transmitter comprising a unit for producing an output pneumatic signal from a pneumatic source in relatio... | 05/08/1990 |
| 4833924 | Differential pressure transmitter, a square root extractor device therefor and methods of making the same A differential pressure transmitter, a pneumatically operated square root extracting device therefor and methods of making the same are provided, the transmitter comprising a unit for producing an output pneumatic signal from a pneumatic source in relatio... | 05/30/1989 |
| 4654813 | Electronic square root error indicator An apparatus for determining a square root averaging error for a differential pressure orifice meter while measuring volumetric fluid flow in a closed medium including input circuitry that provides an input signal corresponding to the instantaneous differ... | 03/31/1987 |
| 4535283 | Device for conversion of non-electrical quantity into electrical signal Device for conversion of a nonelectrical quantity into an electrical signal comprises measuring and compensating bridge circuits whose supply arms are connected to a power supply. A nonelectrical quantity like strain, force or pressure acts on the input o... | 08/13/1985 |
| 4388691 | Velocity pressure averaging system A device which can determine either the velocity pressure or the velocity of a flowing gas or air stream and averages same over a predetermined period of time is disclosed. The device utilizes a three-hole yaw probe or similar sensing means which is immer... | 06/14/1983 |
| 4384492 | Linear air velocity transmitter, square root extractor device therefor and methods of making the same A differential pressure transmitter having structure for producing an output pneumatic signal from a pneumatic source in relation to the air velocity pressure of air flowing in the passage structure that senses the difference between the total pressure an... | 05/24/1983 |
| 4238965 | Two wire flow rate transmitter The disclosed transmitter operates in a two wire process control system to modify a loop current through the two wires that are representative of pressure drop through an orifice into a second loop current through the two wires that are representative of ... | 12/16/1980 |
