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T400 Ozone Analyzer Operator’s Manual Troubleshooting & Service
255
12.4. GAS FLOW PROBLEMS
In general, flow problems can be divided into three categories:
Flow is too high
Flow is greater than zero, but is too low, and/or unstable
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 detection hardware and software are in error.
Use an independent flow meter to perform a flow check as described in Section 11.3.6.
12.4.1. TYPICAL FLOW PROBLEMS
12.4.1.1. 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 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 11.3.6.
If no in
depen
dent flow meter is available:
1. Disconnect the gas lines from both the sample inlet and the exhaust outlet on the
rear panel of the instrument.
2. Make sure that the unit is in basic SAMPLE Mode.
3. Place a finger over an exhaust outlet on the rear panel of the instrument.
4. If gas is flowing through the analyzer, you will feel pulses of air being expelled from
the exhaust outlet.
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 make sure that:
All calibrators/generators are turned on and working correctly.
Valves, regulators and gas lines are not clogged or dirty.
12.4.1.2. Low Flow
Check if the pump diaphragm is in good condition. If not, rebuild the pump (all
Teledyne API for instructions). Check the spare parts list for information of pump
rebuild kits.
Check for leaks as described in Section 11.3.4. Repair the leaking fitting, line or
valve and re
-che
ck.
Check for the sample filter and the orifice filter for dirt. Replace filters (see
Sections11.3.1 and 12.10.1 respectively).
Che
ck for partially plugged pneumatic lines, orifices or valves. Clean or replace
them. The critical orifice should be replaced if it becomes plugged.
If an IZS option is installed in the instrument, press CALZ and CALS. If the flow
increases then suspect a bad sample/cal valve.
06870C DCN6332