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Teledyne API T801 NDIR CO2 Analyzer Operation Manual Troubleshooting and Service
189
1. If AC power is being supplied to the pump, but it is not turning, replace the
pump.
2. If the pump is operating but the unit reports no gas flow, perform a flow check
as described in Section 10.3.4.
3. If no indepen
dent flow meter is available:
Disconnect the gas lines from both the sample inlet and the exhaust outlet
on the rear panel of the instrument.
Make sure that the unit is in basic SAMPLE Mode.
Place a finger over a Sample inlet on the rear panel of the instrument.
If gas is flowing through the analyzer, you will feel a vacuum suction at the
inlet.
4. If gas flows through the instrument when it is disconnected from its sources
of zero air, span gas or sample gas, the flow problem is most likely not
internal to the analyzer. Check to ensure that:
All calibrators/generators are turned on and working correctly.
Gas bottles are not empty or low.
Valves, regulators and gas lines are not clogged or dirty.
11.3.2.2. LOW FLOW
1. Check if the pump diaphragm is in good condition. If not, rebuild the pump
(See Section 10.3.2). Check the Spare Parts List for information on pump
rebuild
ing kits.
2. Check for leaks as described in Section 10.3.3. Repair the leaking fitting, line
and re-che
ck.
3. Check for the sample filter and the orifice filter for dirt. Replace filters (See
10.3.1).
4. Che
ck for partially plugged pneumatic lines. Clean or replace them.
5. Check for plugged or dirty critical flow orifices. Replace them.
11.3.2.3. HIGH FLOW
The most common cause of high flow is a leak in the sample flow control. If no
leaks or loose connections are found in the fittings or the gas line between the
orifice and the pump, replace the critical flow orifice inside the sample flow
control assembly.
11.3.2.4. DISPLAYED FLOW WARNINGS
This warning means that there is inadequate gas flow. There are four conditions
that might cause this:
A leak upstream or downstream of the flow sensor
A flow obstruction upstream or downstream of the flow sensor
Bad Flow Sensor Board
Bad pump
To determine which condition is causing the flow problem, view the sample
pressure and sample flow functions on the front panel display. If the sample
pressure is reading abnormally low, then the cause is likely a flow obstruction
07274B DCN6418