Hach-Lange DR 3900 User Manual - Manual (Page 20)

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Installation
3.6.2 Installation of cell adapter
1. Open the cell compartment.
2. Place the cell adapter into cell compartment (2) so that the
arrow on the cell adapter points to the rear ( Figure 5 ).
Note: The arrow on top of the cell adapter indicates the direction of
the light beam path.
Figure 5 Installation of a cell adapter
3.6.3 Use of the light shield for measurements
The light shield ( Figure 6 ) prevents disruptive exposure to light
when 13 mm round cells are used in the cell compartment (1).
Insert the light shield into cell compartment (2) before performing
measurements in cell compartment (1).
The instrument is shipped with the light shield installed. Remove
the light shield before using cell compartment (2).