2101510MNA H | NGC82 00 AN D P GC 1000 US ER MA NUA L |
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10. If the pressure decreases slowly, close the sample shutoff valve and return to the
troubleshooting alarm instructions. The test has failed.
11.3.3
Feed-through assembly blockage test
To troubleshoot feed-through assembly blockage:
1.
Remove the feed-through assembly from the analyzer (see section
).
2.
If testing from the pressure regulator 1 or 2 alarms, continue to steps 3 and 4.
If testing from the stream test in the startup diagnostics or from the sample pressure alarm,
skip to step 5.
3.
Attach the pressure source to CV1 and activate. If the flow through assembly is impeded, the
test has failed. Return to troubleshooting alarm instructions; otherwise, continue to next step.
4.
Attach the pressure source to CV2 and activate. If the flow through assembly is impeded, the
test has failed. Return to the column vent pressure test.
5.
Attach the pressure source to SV and activate. If the flow through assembly is impeded, the
test has failed. Return to the troubleshooting alarm instructions.
11.3.4
Temperature sensor test
To troubleshoot temperature sensor:
1.
Unplug the sensor from the GC module.
2.
Connect the digital multimeter (DMM) set to read resistance, with the positive lead to pin 1 and
the negative lead to pin 2.
3.
The meter should indicate a resistance reading between approximately 10 K ohms and 1 M
ohms. The resistance value is dependent on the temperature of the gas chromatograph oven
and ambient temperature; therefore, any reading in this range should indicate a functioning
temperature sensor.
11.3.5
Abnormal calibration gas depletion
If the calibration (and/or carrier) gas has depleted significantly sooner than expected, there may one
or more issues.
To troubleshoot abnormal calibration gas depletion:
1.
If the analyzer has been running normally but consuming too much calibration (and/or carrier)
gas, carefully leak-test the gas cylinder regulator, tubing and connections to the analyzer.
2.
If it is a new startup installation, check and tighten the analytical module mounting bolt. The
module may have been loosened due to vibration during shipping.
3.
If the device has been disassembled recently, re-check and tighten all assemblies including the
analytical module mounting bolt.
4.
If the analyzer has been powered down for any significant length of time, the calibration (also
carrier and sample) gas should be shut off. Some valves may have been left open or partially
open, allowing gas to continue flowing.
11.4 Power troubleshooting
11.4.1
Overview
This section focuses on determining what has caused the analyzer to lose power. Generally, the loss of
power can be attributed to only the power supply system. However, if the power supply system is
used for powering a transceiver, or other peripheral equipment, a problem with that equipment may
drain the battery and cause the analyzer to lose power.
11.4.2
Power supply voltage test
This test assumes a power supply is in good working order and has previously been tested and
qualified to power an analyzer. If the power supply is under suspicion, it is recommended that it be
replaced with a known good power supply before conducting these tests.
To test power supply voltage:
1.
Check that the power supply voltage setting, the power supply current rating, and the cables
used for the installation meet the recommended requirements (see section
).
2.
If this is a new installation and the external equipment is being powered from the analyzer
termination panel, call technical support for help in evaluating the cable and power supply
installation requirements. Correct and retest as necessary.
3.
Check for a poor cable connection in the cable between the analyzer and the power source.
Verify that all field wiring screw terminals are tight. Correct and retest as necessary.
