Metrohm 940 Professional IC Vario ONE/ChS/LPG - Manual (Page 60)

3.22 Connecting the separation column
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940 Professional IC Vario ONE/ChS/LPG (2.940.1250)
NOTE
The separation column may not be connected until after the instrument
has already been put into operation once (see Chapter 3.20, page 46).
The guard column and separation column have to be replaced by a
coupling (6.2744.040) until then.