Metrohm 909 UV Digester - Manual (Page 20)

3.3 Mounting the UV protective shield
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909 UV Digester
Ensure that the UV protective shield is positioned towards the front.
Figure 7 Positioning the UV protective shield over the wet end
3 Place the stop removed earlier over the threaded hole in the back on
the housing.
Ensure that the metal ring for the UV protective shield is located in
the slot between the lower and upper part of the stop.