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P/N 06160D DCN6409 Teledyne API Model 465M O
3
Monitor Instruction Manual - Page 68
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.
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.