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Teledyne API T801 NDIR CO2 Analyzer Operation Manual Troubleshooting and Service
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11.6.8. PRESSURE/FLOW SENSOR ASSEMBLY
The pressure/flow sensor PCA can be checked with a Voltmeter using the
following procedure which, assumes that the wiring is intact, and that the
motherboard and the power supplies are operating properly:
1. For Pressure related problems:
Measure the voltage across C1 it should be 5 ± 0.25 VDC.
If not, then the board is bad.
Measure the voltage across TP4 and TP1.
With the sample pump disabled it should be 4500 mV ±250 mV.
With the pump energized it should be approximately 200 mV less. If not,
then S1, the pressure transducer is bad, the board is bad, or there is a
pneumatic failure preventing the pressure transducer from sensing the
absorption cell pressure properly.
2. For flow related problems:
Measure the voltage across TP2 and TP1 it should be 10 ±0.25 VDC.
If not, then the board is bad.
With flow stopped (sample inlet blocked) the voltage should be
approximately 1V.
If the voltage is incorrect, the flow sensor is bad, the board is bad or there is
a leak downstream of the sensor.
07274B DCN6418