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T400 Ozone Analyzer Operator’s Manual Instrument Maintenance
233
4. Remove the instrument cover and locate the sample pump. Disconnect the two
fittings on the sample pump and install a union fitting in place of the pump. The
analyzer cannot be leak checked with the pump in line due to internal leakage that
normally occurs in the pump.
5. Pressurize the instrument with the leak checker, allowing enough time to pressurize
the instrument through the critical flow orifice fully. Check each fitting with soap
bubble solution, looking for bubbles. Once the fittings have been wetted with soap
solution, do not re-apply vacuum, as it will draw soap solution into the instrument
and contaminate it. Do not exceed 15 psi pressure.
6. If the instrument has one of the zero and span valve options, the normally closed
ports on each valve should also be separately checked. Connect the leak checker
to the normally closed ports and check with soap bubble solution.
7. If the analyzer is equipped with an IZS option, connect the leak checker to the dry
air inlet and check with soap bubble solution.
8. Once the leak has been located and repaired, the leak-down rate should be < 1 in-
Hg (0.4 psi) in 5 minutes after the pressure is shut off.
06870C DCN6332