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Model 200EU-NOy Option Manual Addendum
05386 Rev. D 27
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 instrument power and pump power.
2. Cap the sample inlet port, bypass out port, ozone generator air inlet, and zero/span inlets
(if Z/S valve option present).
3. Insert a shut-off valve between the sample pump and the exhaust port at the rear of the
instrument.
4. Turn on instrument and sample pump power. 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 drop more than 1"Hg (.5psi) in 5 minutes. If there is a
leak, it is not possible to tell where it is located using this method. You can locate the
leak by using a pressure leak checker described below.
If you have a leak checker:
1. Turn off instrument power and pump power.
2. Disconnect the sample pump at the rear panel. Cap the sample inlet port, bypass out port,
ozone generator air inlet, and zero air inlet (if Z/S valve option present) and connect the
leak checker to the instrument exhaust port.
CAUTION!
Pressure must be less than 15 PSI.
3. Pressurize system and check for leaks by watching overall pressure. The pressure should
not drop more than 1"Hg (.5psi) in 5 minutes.
If the instrument fails the pressure test, each fitting needs to be leak checked to find the location.
Be careful that the system is always pressurized so as not to draw soap solution into the
plumbing system. Make sure you dry off any accumulated bubble solution. Start by checking the
external fittings first.