Test apparatus for a waveguide sensing level in a container

• US 7,088,285 B2
• Filed: 05/25/2004
• Issued: 08/08/2006
• Est. Priority Date: 05/25/2004
• Status: Active Grant

• Current Assignee: Rosemount Incorporated (Emerson Electric Company)
• Original Assignee: Rosemount Incorporated (Emerson Electric Company)
• Inventors: Smith, Lee Michael
• Primary Examiner(s): Tarcza, Thomas H.
• Assistant Examiner(s): BARKER, MATTHEW M
• Application Number:
  US10/853,587
• Publication Number:
  US 20050264440A1
• Time in Patent Office: 805 Days
• Field of Search: 342/124
• US Class Current: 342/124
• CPC Class Codes: G01F 23/284 Electromagnetic waves
• CPC Class Codes: G01F 25/20 of apparatus for measuring liquid level

Abstract

A test apparatus for a waveguide that senses levels in a container. The test apparatus includes a bridge with a test position where the bridge bridges the waveguide to simulate a simulated level. The bridge also has a storage position. The test apparatus also has an actuator coupled to the bridge that moves the bridge between the test and storage positions.

Claims

1. A test apparatus for a waveguide that senses level in a container, the test apparatus comprising:

a bridge having a test position in which the bridge bridges the waveguide to simulate a simulated level, and having a storage position in which the bridge does not bridge the waveguide; and

an actuator coupled to the bridge to move the bridge between the test position and the storage position.

2. The test apparatus of claim 1 wherein the actuator includes a member coupled to the bridge.

3. The test apparatus of claim 2 wherein the actuator includes a bearing in which the member is movably mounted.

4. The test apparatus of claim 1 wherein the waveguide comprises a pair of generally parallel conductors and the bridge comprises a bar that bridges the conductors in the test position.

5. The test apparatus of claim 1 further comprising a handle coupled to the member to provide manual actuation.

6. The test apparatus of claim 1 wherein the actuator is remotely actuated to move between the test and storage positions.

7. The test apparatus of claim 1 further comprising an indicator positioned outside the container and indicating actuation to the test position.

8. The test apparatus of claim 1 wherein the simulated level is higher than the sensed levels.

9. The test apparatus of claim 1 wherein the bearing comprises a sleeve bearing.

10. The test apparatus of claim 1 wherein the bearing comprises a block having a hole, and the member comprises a shaft that passes through the hole.

11. The test apparatus of claim 10 wherein the shaft has a lengthwise axis that is vertical.

12. The test apparatus of claim 10 wherein the shaft is slidably movable in the block.

13. The test apparatus of claim 10 wherein the block comprises a portion of the container.

14. The test apparatus of claim 10 wherein the block comprises a level transmitter flange.

15. The test apparatus of claim 1, further comprising:

a level transmitter coupled to the waveguide and providing a level output.

16. The test apparatus of claim 15 wherein the simulated level comprises a first level signal quality that is different that level signal qualities of the levels sensed in the container, and the level transmitter senses the first level signal quality and provides a diagnostic output indicating whether the level output is simulated or sensed.

17. A test apparatus for a waveguide that senses levels in a container, the test apparatus comprising:

a bridge having a test position in which the bridge bridges the waveguide to simulate a simulated level, and having a storage position in which the bridge does not bridge the waveguide;

support means supporting the bridge; and

actuation means actuating the bridge to move between the test position and the storage position.

18. The test apparatus of claim 17 wherein the simulated level is higher than the sensed levels.

19. The test apparatus of claim 17 wherein the support means comprise a block having a hole, and the member comprises a shaft that passes through the hole.

20. The test apparatus of claim 19 wherein the shaft is slidably movable in the block.

21. The test apparatus of claim 17, further comprising:

a level transmitter coupled to the waveguide and providing a level output; and

the simulated level comprising a first level signal quality that is different that level signal qualities of the levels sensed in the container, and the level transmitter senses the first level signal quality and provides a diagnostic output indicating whether the level output is simulated or sensed.

22. A method for testing a waveguide that senses levels in a container, the method comprising:

providing a bridge that is movable between a test position in which the bridge bridges the waveguide to simulate a simulated level, and a storage position in which the bridge does not bridge the waveguide; and

actuating a member move the bridge between the test position and the storage position.

23. The method of claim 22, further comprising:

supporting the bridge with a bearing and a member that is movably mounted to the bearing.

24. The method of claim 22 further comprising:

providing a manual actuator for actuating the member.

25. The method of claim 22 further comprising:

providing remote actuation for actuating the member.

26. The method of claim 22 further comprising:

positioning an indicator outside the container to indicate actuation to the test position.