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Teledyne API Model 465L O
3
Monitor Operation Manual
82 05509F DCN6409
7.2.4.) Examine the Flow and Pressure values and compare them to the limits described in
Table 10-1 and take appropriate action as described below.
10.2.4.1. Pressure Too High
The monitor inlet is being pressurized. The monitor inlet should be allowed to sample
gas at ambient pressure. Disconnect all sample lines from the monitor and read the
pressure again. If the value then drops to within the acceptable range, then one of the
sample lines is at elevated pressure.
If the inlet is being pressurized, then the design of the sample system should be reviewed
and corrected. Contact Teledyne API customer service for assistance.
10.2.4.2. Pressure Too Low
Something may be restricting the flow through the monitor, causing the sample pump to
pull a vacuum on the sensor module. First, unplug the sample pump power plug on the
Mainboard PCA and observe the pressure reading. If the pressure reading is still too low,
then likely there is a problem with the pressure sensor on the Sensor Module and the
Sensor Module should be replaced. Next reconnect the pump and disconnect all sample
lines from the monitor and see if the pressure increases to normal levels. If it does, then
the problem is somewhere in the sampling system external to the monitor. If the pressure
is still below the limit with the sample lines removed, then there is a restriction in the
pneumatics of the monitor upstream of the sensor assembly. The most likely cause is a
plugged particulate filter. Disconnect the outlet fitting on the sample filter and observe
the pressure. If it returns to normal levels then the restriction is in the particulate filter or
inlet manifold assembly (multi-stream configurations only.) Replace particulate filter per
Section 9.3.