128 1200 Series DAD and MWD User Manual
8Maintenance
Cleaning or Exchanging the Holmium Oxide Filter
When required If holmium oxide filter is contaminated
Tools required Screwdriver POZI 1 PT3
Screwdriver flat blade
Two 1/4 inch wrenches for capillary connections
A pair of tweezers
Parts required Holmium oxide filter 79880-22711
Preparations Turn the lamp(s) off.
Remove the front cover.
Remove the flow cell, see
“Exchanging a Flow Cell” on page 103.
NOTE
See also “Declaration of Conformity for HOX2 Filter” on page 176.
The glass tends to build a film on its surface even under normal environmental conditions.
This is a phenomenon, which can be found also on the surface of several other glasses and
has something to do with the composition of the glass. There is no indication, that the film
has an influence on the measurement. Even in the case of a thick film, which scatters the
light remarkably, no shift of the peak positions is to be expected. A slight change in the
absorbance might be possible. Other components within the light path (lenses,
windows, ...) are also changing their behavior over the time.
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