Teledyne 356WA Instruction Manual page 29

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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.
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