120 | NGC8200 AND PGC1000 USER MANUAL | 2101510MNAH
9. Remove the 8 ¼” hex socket mounting screws.
10. Remove the damaged gasket from the internal plate.
11. Clean the gasket area on the internal plate using a clean, dry lint-free cloth before placing the
new gasket on the internal plate. The gasket is keyed to ensure that it is placed correctly. The
gasket should not cover any holes in the internal plate.
12. Reseat the external plate, aligning the mounting pins on the internal plate to the corresponding
holes on the external plate.
13. Replace the 8 ¼” mounting screws, using a star pattern when tightening the screws.
14. If the sample, carrier and calibration gas lines were removed, purge air from the transport
tubing, and reconnect to the corresponding ports. Do not over-tighten.
15. After securing the tubing, check for gas leaks.
10.23 Replace the feed-through manifold gasket
If the feed-through manifold gasket requires replacement (see Figure 10-20), follow these
instructions. Typically, the user would change the gasket while performing another procedure, but for
the purposes of this manual, the instructions will start and finish as a complete procedure.
To replace the feed-through manifold gasket:
1. On the Analyzer Operation screen, click Hold under Next Mode. When the device completes the
current cycle and enters hold, continue to the next step.
2. Collect data from the device.
3. Back up the configuration files, following the instructions detailed in section 10.6.
4. Using the Lithium battery status instructions, verify that the battery status is ok before
proceeding.
5. Turn off all the sample streams, calibration gas and carrier gas.
6. Disconnect or remove power from the device externally or remove the J1 connector from
termination panel.
7. Gain access to the digital controller assembly by loosening the countersunk hex socket locking
set screw in the front end cap using a 1/16” hex wrench then unscrewing the end cap.
8. Following the instructions detailed in section, 10.14 to remove the assembly. If weather and
circumstances permit, the digital controller assembly may be suspended by the cables to
eliminate stress on cable connections and you can move to step 10.
9. Carefully unplug the cable to the termination panel, leaving the lithium battery plugged in, and
set the digital controller assembly aside on a clean, lint-free surface.
10. Using a 5/16” hex wrench, loosen the mounting screw holding the analytical module in place
until the module can be slowly lifted from the enclosure, taking care to not pull the wires
attached to the rear of the assembly.
11. Detach analytical module rear face jack J1 and J4 if the auxiliary heater is installed.
12. Set the module on a clean, lint-free surface.
13. Replace the gasket on the feed-through assembly manifold interface, ensuring that the gasket
does not cover the gas port holes.
14. Insert the mounting screw into the analytical module.
15. Holding the analytical module at the opening of the enclosure, reconnect jumper J1 and J4 if
the auxiliary heater is installed (see Figure 10-15).
16. Carefully insert the module into the enclosure, rotating the module to ensure the rear
components clear the manifold interface on the inside area of the feed-through assembly. The
feed-through manifold interface and the analytical module are keyed to ensure proper
alignment.
17. When the analytical module is in place, tighten the mounting screw.
18. Follow the instructions in section 10.15 to replace the assembly.
19. Plug the termination panel to the digital controller ribbon cable into the digital controller
assembly.
IMPORTANT NOTE: Note that the termination panel to the digital controller ribbon cable pin 1
wire is not red. On the digital controller board, the red edge (pin 1) of the cable should plug onto
pin 50, the right side of plug. The plug is keyed; do not force the plug into the connector.
20. Insert the lithium battery pack into the enclosure between the enclosure and the thermal flask.
21. Once the device is reassembled, apply power to the analyzer.
22. Reinstall the front and rear end caps.
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