Teledyne T803 11.3.2. TYPICAL SAMPLE GAS FLOW PROBLEMS

Teledyne API T803 CO2/O2 Analyzer Operation Manual Troubleshooting and Service
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11.3.2. TYPICAL SAMPLE GAS FLOW PROBLEMS
11.3.2.1. FLOW IS ZERO
The unit displays a SAMPLE FLOW warning message on the front panel display
or the SAMPLE FLOW test function reports a zero or very low flow rate.
Confirm that the sample pump is operating (turning). If not, use an AC voltmeter
to make sure that power is being supplied to the pump. If no power is present at
the electrical leads of the pump, take the following steps:.
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 independent 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
rebuilding kits.
2. Check for leaks as described in Section 10.3.3. Repair the leaking fitting, line
and re-check.
3. Check for the sample filter and the orifice filter for dirt. Replace filters (See
10.3.1).
4. Check 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.
07276B DCN6418