Pressure Leak Check - Teledyne T400 User Manual

5.6.5.2

PRESSURE LEAK CHECK

If you can't locate the leak by the above procedure, obtain a leak checker that contains a
small pump, shut-off valve and pressure gauge. Alternatively, use a tank of pressurized
gas, with the two-stage regulator adjusted to less than 15 psi with a shutoff valve and
pressure gauge.
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
3. Install a cap on the rear panel's EXHAUST fitting.
4. Remove the instrument cover and locate the sample pump. Disconnect the two
5. Pressurize the instrument with the leak checker, allowing enough time to fully
6. If the instrument has one of the zero and span valve options, the normally closed
7. If the analyzer is equipped with an IZS option, connect the leak checker to the dry
8. Once the leak has been located and repaired, the leak-down rate should be < 1 in-
108
Do not use bubble solution with vacuum applied to the analyzer, as
the solution may contaminate the instrument. Do not exceed 15
PSIG pressure.
rear panel.
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.
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 suck soap solution into the
instrument and contaminate it. Do not exceed 15 psi pressure.
ports on each valve should also be separately checked. Connect the leak checker
to the normally closed ports and check with soap bubble solution.
air inlet and check with soap bubble solution.
Hg (0.4 psi) in 5 minutes after the pressure is shut off.
Teledyne API – Model T400 O
CAUTION
Analyzer 083730400A DCN8130
3