Teledyne 356WA instruction manual Trace Oxygen Analyzer

Trace Oxygen Analyzer Maintenance & Troubleshooting 5

If there is no rise in oxygen reading when the sample flow is restarted in step 5.9.1.b, the measuring cell should be checked for leaks. The two most likely leaks locations are at the two terminal seal O-rings, or at the large O- ring in the cell block mounting base.

Check that the terminals are screwed tightly into place. Frequently, when a leak occurs at a terminal connection, a greenish crystalline deposit will be found inside the cell around the terminal mounting screw. This is lead carbonate, which is formed by carbon dioxide in the air reacting with lead ions in the electrolyte.

If the large O-ring at the mounting plate is leaking, the oxygen indica- tion will begin rising almost immediately after the sample flow is stopped. It will continue to rise until sample flow is restarted, at which time it will begin to gradually decrease.

Teledyne Analytical Instruments 5-7