Metrohm NIRS XDS Transmission OptiProbe Analyzer - Manual (Page 68)

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Turn off power at the power switch located on
the back panel.
The power cord may be removed for easier
access to the filter, if desired. This is not essential,
though we did remove it here for photos
Using both hands, grasp the filter cover and
gently unsnap it, starting at the top, and working
to the sides and bottom.
Lift the filter cover off and examine the filter
material. If clogged, it should be replaced.
A spare filter is included in the accessory box.
Using the new filter material, gently insert it into
the filter cover. It should fit easily in any direction,
as it is symmetrical.