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MAINTENANCE SCHEDULE & PROCEDURES
9.3.4.2. Pressure Leak Check
If you can't locate the leak by the above procedure, obtain a leak checker similar to
the T-API part number 01960, which contains a small pump, shut-off valve, and
pressure gauge. Alternatively, a tank of pressurized gas, with the two stage
regulator adjusted to = 15 psi; a shutoff valve and pressure gauge may be used.
1. Turn OFF power to the instrument.
2. Install a leak checker or tank of gas as described above on the sample inlet at
the rear panel.
3. Install a cap on the Exhaust fitting on the rear panel.
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 fully
pressurize the instrument through the critical flow orifice. 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.
212
Once the fittings have been wetted with soap solution, DO NOT
apply / re-apply vacuum as this will cause soap solution to be
drawn into the instrument, contaminating it.
DO NOT exceed 15 psi pressure.
Model 400E Ozone Analyzer
CAUTION
Instruction Manual
P/N 04316 Rev: B
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