Teledyne 9110AH - Nitrogen oxides analyzer - Manual (Page 115)

TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
8-13
8.6 Leak Check Procedure
If a leak checker is not available, it is possible to leak check the instrument using the
M9110AH's pump plus a shut-off valve.
1. Turn off instrument power and pump power.
2. Cap the sample inlet port, ozone generator air inlet, and zero air inlet (if Z/S valve option
present).
3. Insert a shut-off valve between the sample pump and the vacuum manifold at the rear of the
instrument.
4. Turn on the sample pump and set the TEST function to RCEL, which measures the reaction
cell pressure. Turn off the shutoff valve and monitor the cell pressure. The pressure should
not drop more than 1 PSI in 5 minutes.
If you have a leak checker:
1. Turn off instrument power and pump power.
2. Disconnect pump at rear panel. Cap the sample inlet port, ozone generator air inlet, and zero
air inlet (if Z/S valve option present) and connect leak checker to 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 in 5 minutes (0.5 PSIG in 5 min).
If instrument fails pressure test, each fitting needs to be leak checked with soap solution 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 soap solution. Refer to
Figure 8-4, Figure 8-5 for pneumatic diagrams.
8.7 Light Leak Check Procedure
1. Scroll the TEST functions to PMT.
2. Input zero gas.
3. Shine a powerful flashlight or portable incandescent light at the inlet and outlet fitting, and
at all the joints of the reaction cell. The PMT value should not respond to the light.
If there is a response, tighten the joints or replace the tubing with new black PTFE tubing. We
often find light leaks are caused by o-rings being left out of the sensor assembly.