Differential pressure transmitter with pressure sensor
First Claim
1. A process variable transmitter for measuring a pressure of a process fluid, comprising:
- a first inlet configured to couple to a first process pressure and a second inlet configured to couple to a second process pressure;
a differential pressure sensor fluidically coupled to the first and second inlets having an output related to a differential pressure between the first pressure and the second pressure;
a first pressure sensor fluidically coupled to the first inlet having an output related to the first pressure, wherein the first pressure sensor couples directly to the process fluid; and
transmitter circuitry configured to provide a transmitter output based upon the output from the differential pressure sensor and further provide enhanced functionality based upon the output from the first pressure sensor.
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Abstract
A process variable transmitter for measuring a pressure of a process fluid includes a first inlet configured to couple to a first process pressure and a second inlet configured to couple to a second process pressure. A differential pressure sensor couples to the first and second inlets and provides an output related to a differential pressure between the first pressure and the second pressure. A first pressure sensor couples to the first inlet and provides an output related to the first pressure. Transmitter circuitry provides a transmitter output based upon the output from the differential pressure sensor and further provides enhanced functionality based upon the output from the first pressure sensor.
153 Citations
20 Claims
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1. A process variable transmitter for measuring a pressure of a process fluid, comprising:
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a first inlet configured to couple to a first process pressure and a second inlet configured to couple to a second process pressure; a differential pressure sensor fluidically coupled to the first and second inlets having an output related to a differential pressure between the first pressure and the second pressure; a first pressure sensor fluidically coupled to the first inlet having an output related to the first pressure, wherein the first pressure sensor couples directly to the process fluid; and transmitter circuitry configured to provide a transmitter output based upon the output from the differential pressure sensor and further provide enhanced functionality based upon the output from the first pressure sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of measuring a pressure of a process fluid in a process variable transmitter, comprising:
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coupling a first passageway to a first process pressure; coupling a second passageway to a second process pressure; sensing a differential pressure between the first process pressure and the second process pressure using a differential pressure sensor in the process variable transmitter fluidically coupled to the first and second passageways; sensing the first process pressure with a first pressure sensor fluidically coupled directly to the process fluid in the first passageway; providing a transmitter output related to the differential pressure sensed by the differential pressure sensor; and providing enhanced functionality to the process variable transmitter based upon an output from the first pressure sensor. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A process variable transmitter for measuring a pressure of a process fluid, comprising:
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a first isolation diaphragm configured to couple to a first process pressure and a second isolation diaphragm configured to couple to a second process pressure; a differential pressure sensor fluidically coupled through a fill fluid to the first and second isolation diaphragms having an output related to a differential pressure between the first pressure and the second pressure; a first pressure sensor fluidically coupled directly to the process fluid having an output related to the first pressure; transmitter circuitry configured to provide a transmitter output based upon the output from the differential pressure sensor and the output from the first pressure sensor; and a flange having a first inlet which couples the first process pressure to the first diaphragm and a second inlet which couples the second process pressure to the second diaphragm, the flange further including a first internal passageway which couples the first inlet to the first pressure sensor. - View Dependent Claims (20)
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Specification