4.2.5 Exhaust and SP Exhaust Ports
The EFC “Exhaust” and “SP Exhaust” ports are carrier gas and also part of the sample during sample
injection. To ensure correct operation of the instrument, the "Exhaust" and “SP Exhaust” ports
should not be blocked. If necessary, the ports may be ducted to a lab exhaust system, but this should
not restrict the flow.
4.2.6 Inlet Cooling
OPTIC-4 system provides multiple cooling options for the inlet. In the standard configuration, OPTIC-
4 is supplied with the compressed air inlet cooling. If requires, the inlet can be cooled down to sub-
ambient temperature. In this case either CO
2
(-50 °C) or liquid N
2
(-180 °) cooling option should be
used.
For optimum cooling efficiency, standard OPTIC-4 inlet requires a supply of the compressed air at
least 500 kPa. A lower pressure supply can be used, but the inlet cooling will work slower.
While analytical grade air is not needed, the air supply should be filtered to be free of moisture, oil
and particulates.
1. Connect the compressed air supply to the “Air In” coupling of the solenoid valve (Fig. 4.1) on
the OPTIC-4 rear panel.
2. Connect a piece of the PTFE tubing between the “To Inlet” port of the solenoid valve and the
inlet cooling connection (Fig. 4.4).
For installation of the CO
2
and liquid Nitrogen inlet cooling options refer to the installation guides
supplied with the kits.
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