AMA Instruments The GC 5000 BTX, Operating Manual, Page: 133 / 152

Operating Manual GC 5000 BTX; Version 5 – 11/2010 131
13.3.14 Exchange the Peltier cooler fan
1.
Close the carrier gas supply.
2. Remove the PVC cover.
3. Unplug the thermocouple plug of the enrichment tube.
4. Disconnect the power cable of the Peltier cooler.
5. Demount the 1/8” nuts on both sides of the enrichment tube.
6. Loosen the brass nuts on the ceramic isolators.
7. Demount the hexagonal screw which fixes the cooler in its case.
8. Take the cooler out of the case.
9. Remove the two screws of the fan.
10. Unsolder the two wires of the fan. (Notice the orientation of the
wires!) (You can demount the four plastic distance bolts to simplify the
access to the bottom side of the PCB.).
11. Solder in the two wires of the new fan in the same orientation as with
the old fan.
12. Mount the fan on the heat sink with the two screws.
13. Put the cooler into the case and fix it with the hexagonal screw.
14. Mount the 1/8” nuts on both sides of the enrichment tube.
15. Tighten the brass nuts on the ceramic isolators.
16. Connect the power cable of the cooler.
17. Plug in the thermocouple plug of the enrichment tube.
18. Put on the PVC cover.
The new Peltier cooler fan is inserted now.
13.3.15 FID maintenance
Caution!
While inserting the new FID jet, it can get contaminated. This will decrease
the measurement signal or cause noise and a high baseline. Therefore
do
not touch the FID jet with your fingers, use a pair of tweezers or pliers.
1. Pull the FID cover off the detector.
2. Unplug the two cables of the FID.
3. Remove the six screws of the FID top.
4. Remove the FID top. Loosen the nut of the FID jet.
5. Pull out the old FID jet.
6. Insert the new FID jet with pliers or a pair of tweezers. (Do not touch it
with your fingers!).
7. Exchange the Teflon O-ring seal.
8. Put the FID top in and mount it with the six screws again.
9. Plug in the two cables.
10. Put on the FID cover.
The new FID jet is inserted.