NOTE:
The removal of an inlet port entails the removal of inlet heater and temperature sensor.
Some GC’s will treat the absence of the sensor as a fault. In such cases a resistor has to be
fitted in place of the sensor (refer to the OPTIC installation kit for details) and the GC's
inlet control must be switched off at all times.
4.1.2 Inlet Installation
1. Determine the location for the OPTIC-4 inlet and if necessary remove or relocate the existing
inlet port.
2. Fit the inlet body directly onto the GC inlet mounting bracket (Agilent 6890/7890) or onto
the mounting plate provided with the installation kit.
3. Identify the inlet gas lines by their labels and decide on the best routes for them. Uncoil the
pipes as well as all the electrical leads.
4. Inside the column oven, pack mineral wool insulation tightly around the inlet in order to
ensure that hot air from the oven cannot leak out around the newly installed inlet.
5. Connect the inlet thermocouple to the “Inlet TC” connector on the rear panel of OPTIC-4.
6. If required the OPTIC-4 external solvent monitor should be installed in the split line. Connect
the solvent monitor cable to the “External Solvent Monitor” connector on the rear panel.
7. Install the GC oven thermocouple supplied with the OPTIC-4 installation kit into the GC oven
as close as possible to the GC’s own oven temperature sensor. Connect the thermocouple to
the “GC TC” connector on the OPTIC-4 rear panel.
8. OPTIC-4-SC and OPTIC-4-DC only: the installation and connection of the cryotrap are
described in Section 4.6 “OPTIC-4 Cryotrap Installation”.
9. The connection of the OPTIC-4 to the host GC and autosampler is described in Section 1.3 of
this chapter and in the manual supplied with the trap installation kit.
4.2 Gas Lines Connections
Most of the gas line connections to the OPTIC-4 control unit rear panel are made using 1/8”
pneumatic fittings. The inlet gas lines are connected to the EFC using a special plate with o-ring seals.
A standard OPTIC-4S control unit has the following gas line connections on the rear panel:
• Carrier Gas In (from cylinder or other carrier gas supply source)
• Inlet Gas Lines
• Exhaust
• SP (Septum Purge) Exhaust
• Cooling Air In
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