2101510MNAH | NGC8200 AND PGC1000 USER MANUAL | 127
7. Perform startup diagnostics.
8. If the carrier pressure regulator 1 and 2 tests both pass, continue to the next step.
9. Perform the Column Vent Pressure Test (see section 11.3.1) for both column vent 1 and
column vent 2. If either test failed, proceed to the next step.
10. Perform the Feed-through Assembly Blockage Test (see section 11.3.3) on column vent 1 (CV1)
and column vent 2 (CV2). If the test fails, replace the feed-through assembly with a new or
refurbished assembly.
11. We recommend that a replacement analytical module be installed at this point and additional
steps be performed in a clean, lint free atmosphere.
12. Replace the analytical module.
13. Replace the GC Module.
11.2.3 Sample Pressure Alarm
This alarm indicates low sample or calibration gas pressure. The causes range from an empty or low
calibration gas cylinder to a blockage inside the GC module.
To troubleshoot sample pressure:
1. If the calibration gas cylinder regulator includes an installed low pressure switch, investigate if
the low cylinder calibration gas warning is also present.
2. If the low cylinder calibration gas warning is present, replace the calibration gas cylinder.
3. Verify the calibration gas cylinder pressure is above 15 PSIG. If the pressure is below 15 PSIG,
replace the calibration gas cylinder.
4. Verify the calibration gas cylinder pressure regulator set point is 15 PSIG. If not, correct the set
point to 15 PSIG.
5. Verify the sample vent is open and unobstructed.
6. Perform the Sample pressure test. If the test failed, continue to the next step; otherwise, skip
to step 8.
7. Perform the Feed-through assembly blockage test (see section 11.3.3), on the sample vent
(SV). If the test fails, replace the feed-through assembly.
8. Check the sampling system for leaks and tubing restrictions. Repair any leak or restriction.
9. Perform startup diagnostics. If the stream test fails, continue to the next step.
10. Verify filters are clean and free of obstructions. If needed Replace frit filters.
11. Replace the analytical module.
12. Replace the GC Module.
11.2.4 Oven Temperature Error Alarm
This alarm indicates an issue surrounding the ability to control the oven temperature. The causes
range from an unplugged cable, to an inability to communicate with a sensor.
To troubleshoot oven temperature error:
1. Verify that the auxiliary heater switch on the analytical processor board coincides with the feed-
through assembly configuration. If the feed-through assembly has an installed auxiliary heater,
verify that the switch on board is set to normal. If no auxiliary heater is installed, the switch
should be set to override.
2. Verify that the temperature sensor is plugged into the GC module.
3. Perform the Temperature sensor test. If the test fails, Replace the GC Module.
4. The remaining options are not field-repairable. Replace the analytical module.
11.2.5 No Stream Valve Selected
This alarm indicates an attempt to run a cycle with insufficient sample pressure. If the sample
pressure is too low when diagnostics are run, it will disable all streams but continue to try and run
chromatograms.
To troubleshoot no stream valve selected:
1. Check the sampling system for leaks, tubing restrictions and incorrect pressure settings. Repair
the leak or restriction or adjust the pressure setting if found.
2. Place the analyzer in hold, allow ten minutes (approximately two cycles) to lapse and then run
a single cycle. If the alarm reappears, continue to the next step.
3. The device should still be in hold. Manually enable all streams.
4. Perform startup diagnostics. If the stream test fails, continue to the next step.
5. Perform a warm start (see section 10.9.1).
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