1.4 Warnings Signs
HIGH VOLTAGE: Disconnect power cable before removing any units cover.
1.5 Cryogenic Trap Precautions and Warnings
The following cautions and warnings relate to the cryotrap fitted to OPTIC-4SC and OPTIC-4DC.
1. The cryotrap cannot be used with a metal column. The metal column will short-circuit the
trap heater, causing severe damaged to the trap. A glass capillary pre-column is advised to
avoid problems.
2. It is strongly advised not to hold the trap at subambient temperature for longer than 20
minutes. The ice is formed on the points of column near the trap ends if trap is kept cold for
a long time. This penomenon can cause analytical problems and also can bring damage to
the column coating!
3. The cryotrap uses cryogenic liquids (CO
2
and liquid nitrogen) to cool down trap to sub-
ambient temperatures. Personnel must be thoroughly familiar with properties and safety
considerations before being allowed to handle cryogenic liquids and the cryogenic trap.
4. Cryogenic liquids can cause serious burns. Hand protection and goggles (not safety glasses)
are to be worn at all times when handling it. Never allow any unprotected part of the body
to come in contact with un-insulated tubing or parts that contain cryogenic products. The
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