240 Programmed Temperature Vaporization Inlet (PTV)
Replacement procedures
18 of 46
Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
6. Remove (unscrew) the head from the inlet.
7. Remove the heater connector from the side panel, and remove the cryo
connector from the thermocouple conversion board at the back of the GC.
Figure 240-12 PTV electrical connections
8. Replace the PTV inlet assembly and reassemble in reverse order. To attach
the cryo line to the new inlet assembly, tighten the nut finger tight, then
1⁄ 4 turn more using two open end wrenches.
9. Check the system for leaks.
Replacing the CO
2
or LN
2
inlet cryo assembly
1. Once the PTV with cooling assembly is removed, the cryo assembly on
the inlet can be replaced.
2. Remove the PTV inlet as described under Replacing the PTV with cooling
assembly.
3. Remove the three screws on the cryo assembly from the PTV inlet, and
remove the cryo assembly.
Disconnect cable
Remove
connectors
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