Teledyne 300E Instruction Manual page 151

Model 300E Carbon Monoxide Analyzer
Instruction Manual
9.3.3.2. Pressure Leak Check
If you can't locate the leak by the above procedure, use the following 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 convenient source
of low-pressure gas is a tank of span 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 rear panel.
3. Remove the instrument cover and locate the inlet side of the sample pump.
Remove the flow assembly from the pump and plug it with the appropriate
gas-tight fitting.
4. 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 suck soap
solution into the instrument and contaminate it. Do not exceed 15 psi
pressure.
5. 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.
6. 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.
P/N 04288 REV: A
Do not use bubble solution with vacuum applied to the analyzer. The
solution may contaminate the instrument. Do not exceed 15 PSIG
pressure.
MAINTENANCE SCHEDULE & PROCEDURES
CAUTION
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