| Patent Number |
Title Of Patent |
Date Issued |
| 4519253 |
Reactance measurement circuit with enhanced linearity |
May 28, 1985 |
| A circuit for measuring the reactance of a reactance sensor which varies responsive to a condition to be sensed, such as pressure, and which provides an output signal representative of the sensed condition is disclosed. The circuit comprises an oscillator coupled to the sensor for pr |
| 4502003 |
Two wire circuit having an adjustable span |
February 26, 1985 |
| A two wire circuit has a total direct current signal, I.sub.t, proportional to a sensor signal which is responsive to a parameter to be sensed. I.sub.t flows through a first terminal which is coupled to an external power source and load and then through a second terminal. A current c |
| 4481967 |
Control circuit for current to pressure converter |
November 13, 1984 |
| A current-to-pressure converter receives an electrical input signal, such as a DC current, which is a function of a sensed parameter and which is indicative of a desired output pressure. An electrical-to-pressure transducer provides an output fluid pressure as a function of an electr |
| 4466290 |
Apparatus for conveying fluid pressures to a differential pressure transducer |
August 21, 1984 |
| An improved apparatus for conveying fluid pressures to a differential pressure transducer is disclosed. The apparatus comprises a single flange connected to and fluidly coupled to the differential pressure transducer for conveying the fluid pressures thereto. A further improvement compri |
| 4381677 |
Reactance measurement circuit |
May 3, 1983 |
| 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 the sensor for providing a time varying oscillator signal having a variable frequency and |
| 4370890 |
Capacitive pressure transducer with isolated sensing diaphragm |
February 1, 1983 |
| A capacitance transducer has a central chamber with a conductive diaphragm disposed therein to separate the chamber into at least two portions, at least one portion having an electrical conductor disposed thereon to form in combination with the diaphragm at least one variable sensor capa |
| 4325399 |
Current to pressure converter apparatus |
April 20, 1982 |
| The present invention relates to a current controlled pressure regulating apparatus for operating pneumatically operated elements such as valves in process control systems and the like. The apparatus is designed to provide for direct mechanical control of the pressure regulating apparatu |
| 4197739 |
Split bar vortex shedding flowmeter |
April 15, 1980 |
| A vortex shedding flowmeter assembly which utilizes at least one vibrating body that is positioned in relation to an upstream facing vortex forming plate so that vibration of the body caused by vortices formed at the edges of the plate is enhanced. The body is separated from the plate so |
| 4186599 |
Vortex shedding flowmeter assembly |
February 5, 1980 |
| The present invention relates to a flow velocity measuring apparatus which provides a distinct, measurable pattern of vortices known as Karman Vortex Generation. The apparatus is arranged to include a plurality of vortex producing obstructions which co-operate to provide a high signal ou |
| 4171643 |
Vortex shedding flowmeter construction |
October 23, 1979 |
| A vortex flowmeter having a flow obstruction body or vortex forming bar formed in a manner to provide enhanced generation of vortices across a wide range of Reynolds numbers of the fluid being measured. The bar includes projections adjacent the lateral edges thereof which tend to cau |
| 3975719 |
Transducer for converting a varying reactance signal to a DC current signal |
August 17, 1976 |
| A two wire current transmitter providing a current signal representing a parameter measured by a variable reactance transducer along the same two wires that are used to carry excitation power to the circuit. The reactance is measured by a circuit providing a DC signal which controls a |
