Pressure transducer with external heater

• US 20060010983A1
• Filed: 07/16/2004
• Published: 01/19/2006
• Est. Priority Date: 07/16/2004
• Status: Active Grant

• Current Assignee: Rosemount Incorporated (Emerson Electric Company)
• Original Assignee: Rosemount Incorporated (Emerson Electric Company)
• Inventors: Sittler, Fred C., Nord, Christina A., Sund, Wesley E., McIntire, John
• Granted Patent: US 7,347,099 B2
• Time in Patent Office: Days
• US Class Current: 73/754
• CPC Class Codes: G01L 19/0627 Protection against aggressive medium in general

Abstract

An improved pressure transducer is disclosed. The transducer includes a connector, an enclosure, a sensor portion, and an external heater disposed to heat the sensor portion. In some aspects, the sensor portion includes a sensor constructed from a brittle material and does not employ any fill fluid within the sensor. In another aspect, the invention includes a kit that adapts non-heated high purity vacuum transducers for heated use. The kit includes a connector portion and a heater portion that is coupled to the connector portion. The connector portion may also include one or more indicators.

Claims

1. A pressure transducer comprising:

a connector;

a sensor electronics enclosure;

a sensor portion having a sensor formed therein, the sensor portion and being coupled to the sensor electronics enclosure; and

an external heater disposed about the sensor portion to elevate a temperature of the sensor portion.

2. The transducer of claim 1, wherein the sensor is formed of a single crystal material.

3. The transducer of claim 4, wherein the sensor is fusion-bonded.

4. The transducer of claim 1, and further comprising a removable connector portion having an input and an output, the input being coupled the connector of the transducer.

5. The transducer of claim 1, and further comprising heater control circuitry disposed in the connector portion and being coupled to the external heater.

6. The transducer of claim 5, and further comprising a temperature sensor coupled to the heater control circuitry and being disposed to sense a temperature of the sensor portion.

7. The transducer of claim 4, wherein the external heater is coupled to the connector portion outside of the sensor electronics enclosure.

8. The transducer of claim 4, wherein the input and the output are of the same type of connection, but are gender opposites of one another.

9. The transducer of claim 4, wherein the connector portion includes at least one indicator.

10. The transducer of claim 9, wherein the at least one indicator includes an LED.

11. The transducer of claim 1, wherein the external heater includes a bore sized to pass the sensor portion.

12. The transducer of claim 1, wherein the external heater includes a temperature sensor for sensing a temperature of the sensor portion.

13. The transducer of claim 1, wherein the external heater includes a heater wrap affixed to the sensor portion.

14. The transducer of claim 13, wherein the heater wrap includes a temperature sensor for sensing temperature of the sensor portion.

15. The transducer of claim 1, wherein the transducer is a high purity transducer that senses a vacuum.

16. The transducer of claim 1, wherein the sensor is formed of a brittle material.

17. The transducer of claim 1, wherein the external heater is replaceable to vary an operating temperature range of the transducer.

18. The transducer of claim 1, wherein the external heater includes at least one heating element.

19. The transducer of claim 18, wherein the at least one heating element is a coil.

20. The transducer of claim 18, wherein the at least one heating element is an etched trace.

21. A kit for externally heating a sensor portion of a pressure transducer, the kit comprising:

a heater portion sized to externally attach to a sensor portion of a pressure sensor; and

a connector portion coupled to the heater portion and adapted to selectively energize the heater portion in order to maintain the heater portion at an elevated temperature.

22. The kit of claim 21, wherein the heater portion includes a bore sized to pass the sensor portion of the pressure sensor.

23. The kit of claim 21, wherein the heater portion further includes a temperature sensor coupled to the connector portion.

24. The kit of claim 21, wherein the heater portion includes a heater wrap adapted to be affixed to an outer surface of the sensor portion.

25. The kit of claim 24, wherein the heater wrap includes a temperature sensor coupled to the connector portion.

26. The kit of claim 21, wherein the connector portion includes an input and an output, and wherein the input and output are of a same type of connection, but are gender opposites of one another.

27. The kit of claim 21, wherein the connector portion includes at least one indicator.

28. The kit of claim 21, wherein the pressure sensor is a high purity vacuum sensor.

29. A plurality of kits for externally heating a sensor portion of a pressure transducer, the plurality of kits comprising:

a first kit comprising;

a first kit heater portion sized to externally attach to the sensor portion of a pressure transducer; and

a first kit connector portion coupled to the first kit heater portion and adapted to selectively energize first kit heater portion in order to maintain the first kit heater portion at an elevated temperature in a first temperature range; and

a second kit comprising;

a second kit heater portion sized to externally attach to the sensor portion of the pressure transducer; and

a second kit connector portion coupled to the second kit heater portion and adapted to selectively energize second kit heater portion in order to maintain the second kit heater portion at an elevated temperature in a second temperature range.

30. The plurality of kits of claim 29, wherein the first and second temperature ranges do not overlap.

31. A method of operating a pressure transducer having a connector portion and a sensor portion, the method comprising:

providing an electric heater; and

disposing the electric heater to heat an external surface of the sensor portion.

32. A pressure transducer comprising:

a connector;

a sensor electronics enclosure;

a sensor portion having a sensor formed therein, the sensor portion and being coupled to the sensor electronics enclosure; and

means for heating the sensor portion.