Gas Flow Problems; Typical Flow Problems - Teledyne 300E Instruction Manual

Model 300E Carbon Monoxide Analyzer
Instruction Manual

11.2. Gas Flow Problems

In general, flow problems can be divided into three categories:
1. Flow is too high
2. Flow is greater than zero, but is too low, and/or unstable
3. Flow is zero (no flow)
When troubleshooting flow problems, it is a good idea to first confirm that the
actual flow and not the analyzer's flow sensor and software are in error, or the flow
meter is in error. Use an independent flow meter to perform a Flow Check as
described in Section 9.4. If this test shows the flow to be correct, check the
Pressure sensors as described in Section 10.8.10.

11.2.1. Typical Flow Problems

11.2.1.1. 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 see Section 11.5.
If AC power is being supplied to the pump, but it is not turning, replace the pump.
If the pump is operating but the unit reports no gas flow, perform a Flow Check as
described in Section 9.4.2.
If no independent flow meter is available:
Disconnect the gas lines from both the Sample inlet and the Exhaust outlet on
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the Rear Panel of the instrument.
Make sure that the unit is in basic SAMPLE Mode.
§
Place a finger over an Exhaust outlet on the rear panel of the instrument.
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If gas is flowing through the analyzer, you will feel pulses of air being
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expelled from the Exhaust outlet.
P/N 04288 REV: A
TROUBLESHOOTING & REPAIR PROCEDURES
§ Failed Sync/Demod Board
§ Faulty Connectors/Wiring
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