Advanced transmitter isolation feature

• US 20080177484A1
• Filed: 01/24/2007
• Published: 07/24/2008
• Est. Priority Date: 01/24/2007
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Sharma, Thirumala Gb
• Granted Patent: US 7,786,878 B2
• Time in Patent Office: Days
• US Class Current: 702/47
• CPC Class Codes: G01F 1/34 by measuring pressure or differential pressure
• CPC Class Codes: G01F 1/50 Correcting or compensating means
• CPC Class Codes: G01F 25/10 of flowmeters

Abstract

A signal representative of a pressure is received from an industrial transmitter. An isolation indicator signal may be obtained by control signals from an isolation valve assembly or by signals from a DCS to indicate that isolation has occurred.

Claims

1. A system comprising:

a module that receives a first signal representative of a pressure of a fluid proximate an industrial transmitter;

wherein the module determines if the industrial transmitter is isolated from the fluid as a function of the pressure.

2. The system of claim 1, wherein the industrial transmitter is adapted to sense one or more parameters of the group comprising temperature and pressure.

3. The system of claim 2, wherein the pressure comprises one or more of absolute, gauge, and differential.

4. The system of claim 2, wherein the module is further configured to store the one or more parameters in a memory.

5. The system of claim 1, wherein the first signal is representative of a healthiness value associated with a separate device.

6. The system of claim 5, wherein the healthiness value comprises one or more of voltage level, current level, time duration and pressure differential.

7. The system of claim 1, wherein the module receives a second signal representative of a pressure of a fluid proximate the industrial transmitter for determining a pressure difference as a function of the first signal.

8. The system of claim 1, wherein the module is further configured to trigger an alarm as a function of the isolation indication.

9. The system of claim 8, wherein the module is configured to communicate the alarm to a microprocessor system.

10. A method of diagnosing an industrial transmitter coupled to a process fluid, the method comprising:

receiving a first signal representative of a pressure of a fluid proximate an industrial transmitter;

receiving a second signal representative of a pressure of a fluid proximate the industrial transmitter;

calculating a pressure difference as a function of the first and second signals; and

determining if the industrial transmitter is isolated from the fluid.

11. The method of claim 10, further includes receiving a third signal representative of a valve closure event.

12. The method of claim 11, wherein the third signal includes a time duration as a function of the valve closure.

13. The method of claim 10, wherein the first signal representative of a pressure comprises one or more of absolute, gauge, and differential.

14. The method of claim 10, wherein the calculating a pressure difference includes one or more of a first signal representative of a pressure, a second signal representative of a pressure and an elapsed time.

15. The method of claim 10, wherein the calculating occurs at the industrial transmitter.

16. The method of claim 10, wherein the calculating occurs remotely at a central microprocessing system.

17. The method of claim 10, wherein the determining if the industrial transmitter is isolated from the fluid includes reaching a healthiness value associated with a separate device.

18. The method of claim 17, further comprising triggering an alarm as a function of the determining if the industrial transmitter is isolated from the fluid.

19. The method of claim 18, further comprising communicating the alarm to a microprocessor system.

20. The method of claim 10, wherein the receiving a first signal includes storing one or more parameters of the group comprising temperature and pressure in a memory.