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Model GFC7000E Instruction Manual TROUBLESHOOTING & REPAIR PROCEDURES
04584 Rev A1 193
independent flow meter to perform a flow check as described in Section 9.3.4. If this test shows
the flow to be correct, check the pressure sensors as described in Section 11.4.6.5.
11.1.6. Typical Sample Gas Flow Problems
11.1.6.1. 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.
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 9.3.4.
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 an Exhaust outlet on the rear panel of the instrument.
• If gas is flowing through the analyzer, you will feel pulses of air being expelled from the
Exhaust outlet.
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 make
sure 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.
11.1.6.2. Low Flow
1. Check if the pump diaphragm is in good condition. If not, rebuild the pump (see Section
9.3.2). Check the Spare Parts List for information of pump rebuild kits.
2. Check for leaks as described in Section 9.3.3. Repair the leaking fitting, line or valve and re-
check.
3. Check for the sample filter and the orifice filter for dirt. Replace filters (see Sections 9.3.1 and
11.5.1 respectively).
4. Check for partially plugged pneumatic lines, orifices, or valves. Clean or replace them.