PGC5000
PGC5000 Series Service Instructions
7 Subassembly repair
SI/PGC5000-EN, Rev B
74
2. Secure the shield with the Phillips head screw retained earlier.
3. Remove, inspect, and replace if necessary, the PTFE ferrule in the reaction gas assembly before continuing.
The plasma cell is marked with a dot on the end of the cell that installs in the detector body.
4. Install the unmarked end of the plasma cell into the reaction gas assembly. Use caution not to damage the center
electrode ceramic.
5. Tighten the 1/4-inch tube nut finger tight only.
6. Verify the position of the center electrode ceramic. Viewed from the detector end of the plasma cell, the tip of the center
electrode should protrude approximately 1/32-inch past the edge of the high voltage tube clamp.
7. To adjust, loosen the 5/32-inch tube nut on the back of the reactor gas assembly that secures the center electrode.
8. Position the center electrode and tighten the 5/32-inch tube nut.
There are two small parts behind the O-ring, a ceramic and a stainless steel noise shield. Be careful not to
lose these parts.
If the parts fall out, replace them with the ceramic first and then the stainless steel noise shield.
9. Remove the closest nut, ferrule and O-ring from the detector body.
10. Slide the closest nut, ferrule and O-ring onto the marked end of the plasma cell.
11. Gently insert the plasma cell into the body of the detector until it stops.
12. Tight the closest nut finger tight only.
13. While supporting the plasma cell, reconnect the plasma high voltage lead.
14. Reconnect the ground lead, if necessary.
15. Turn on power to the oven.
16. Purge the detector for at least five minutes with reactor gas.
17. Turn on the plasma power supply switch.
18. Enable isothermal oven temperature zone.
19. Allow the oven to heat and stabilize at temperature.
20. Allow the system to purge for five minutes prior to starting the plasma.
7.9.4 Replacing the exhaust tube
It is possible for the exhaust tube to become clogged and require replacement.
1. Remove the old exhaust tube.
2. Measure the insert depth from the tip of the tube to the back of the nut.
3. Disconnect the exhaust tube from the detector vent line.
4. Install a new exhaust tube in the Vespel ferrule on the upper ¼-inch Swagelok fitting.
5. Connect the exhaust tube to the detector vent tubing.
7.9.5 Replacing the power supply
DID Power Supply removal and replacement procedure:
1. Turn off power to the analyzer.
2. Tag all cables connected to the Power Supply.
3. Remove the cables from the Power Supply.
4. Remove the Power Supply from the DIN rail.
5. Attach the new Power Supply to the DIN rail.
6. Reconnect all cables to the Power Supply.
