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Model T200U-NOy Option Manual Addendum
07303C DCN6646 29
6.6 Checking for Leaks
If a leak checker is not available, it is possible to leak check the instrument using
the sample pump plus a shut-off valve.
1. Turn off power to the analyzer and the 501Y, and unplug the external Pump.
2. Cap the sample inlet of the external Converter, the BYPASS OUT port of the
501Y and the ozone generator air inlet (located inside the analyzer, Figure
6).
Figure 6. Location of O
3
Generator Air Inlet
3. Insert a shut-off valve between the external Pump and the EXHAUST port at
the rear of the analyzer.
4. Turn on the analyzer power and plug in the external Pump. Set the TEST
function to RCEL, which measures the reaction cell pressure. Close the
shutoff valve and monitor the cell pressure. The pressure should not
increase more than 1"Hg (.5psi) in 5 minutes. If there is a leak, you’ll need to
locate
it by using a pressure leak checker described below.