Pressure sensor
First Claim
Patent Images
1. A pressure transmitter comprising:
- a pressure sensor including;
a pair of process fluid pressure ports, each port having a deflectable diaphragm adapted for exposure to a process fluid;
a first variable capacitor disposed within the pressure sensor, and having a capacitance that varies with differential pressure between the process fluid ports, the first variable capacitor being formed by at least one capacitive plate operably coupled to at least one of the deflectable diaphragms;
a second variable capacitor disposed within the pressure sensor, and having a capacitance that varies with line pressure, the second variable capacitor being formed by at least one capacitive plate operably coupled to at least one of the deflectable diaphragms;
a loop communicator coupleable to a process communication loop and configured to communicate over the loop;
a controller coupled to the loop communicator; and
measurement circuitry coupled to the controller and to the pressure sensor to provide at least one of an indication of differential pressure and line pressure over the process communication loop.
1 Assignment
0 Petitions
Accused Products
Abstract
A pressure transmitter is provided. The pressure transmitter includes a pressure sensor including a pair of process fluid pressure ports each having a deflectable diaphragm. A first variable capacitor is disposed within the pressure sensor and has a capacitance that varies with differential pressure between the process fluid ports. A second variable capacitor is disposed within the pressure sensor and has a capacitance that varies with line pressure.
57 Citations
25 Claims
-
1. A pressure transmitter comprising:
-
a pressure sensor including; a pair of process fluid pressure ports, each port having a deflectable diaphragm adapted for exposure to a process fluid; a first variable capacitor disposed within the pressure sensor, and having a capacitance that varies with differential pressure between the process fluid ports, the first variable capacitor being formed by at least one capacitive plate operably coupled to at least one of the deflectable diaphragms; a second variable capacitor disposed within the pressure sensor, and having a capacitance that varies with line pressure, the second variable capacitor being formed by at least one capacitive plate operably coupled to at least one of the deflectable diaphragms; a loop communicator coupleable to a process communication loop and configured to communicate over the loop; a controller coupled to the loop communicator; and measurement circuitry coupled to the controller and to the pressure sensor to provide at least one of an indication of differential pressure and line pressure over the process communication loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A pressure transmitter comprising:
-
a pressure sensor including; a pair of process fluid pressure ports, each port having a deflectable diaphragm adapted for exposure to a process fluid; a first beam coupled to a first deflectable diaphragm, and a second beam coupled to the second deflectable diaphragm; a strain sensitive element operably coupled to the first and second beams and configured to have an electrical parameter that changes with strain; a variable capacitor formed between a pair of capacitive plates, the first plate being fixedly mounted adjacent the first and second deflectable diaphragms, and the second plate being operably coupled to one of the first and second beams; a loop communicator coupleable to a process communication loop and configured to communicate over the loop; a controller coupled to the loop communicator; and measurement circuitry coupled to the controller and to the pressure sensor to provide at least one of an indication of differential pressure and line pressure over the process communication loop.
-
-
15. A pressure sensor comprising:
-
a pair of process fluid pressure ports, each port having a deflectable diaphragm adapted for exposure to a process fluid; a first variable capacitor disposed within the pressure sensor, and having a capacitance that varies with differential pressure between the process fluid ports, the first variable capacitor being formed by at least one capacitive plate that operably coupled to at least one of the deflectable diaphragms; and a second variable capacitor disposed within the pressure sensor, and having a capacitance that varies with line pressure, the second variable capacitor being formed by at least one capacitive plate that operably coupled to at least one of the deflectable diaphragms. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A pressure sensor comprising:
-
a pair of process fluid pressure ports, each port having a deflectable diaphragm adapted for exposure to a process fluid; a first beam coupled to a first deflectable diaphragm, and a second beam coupled to the second deflectable diaphragm; a strain sensitive element operably coupled to the first and second beams and configured to have an electrical parameter that changes with strain; and a variable capacitor formed between a pair of capacitive plates, the first plate being fixedly mounted adjacent the first and second deflectable diaphragms, and the second plate being operably coupled to one of the first and second beams.
-
Specification