Hach-Lange DR 3800 User Manual - Manual (Page 126)

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Maintenance
7.3 Filter pad maintenance
To determine when the filter mat needs to be replaced, inspect the
filter mat every 3–6 months (in a relatively dust-free environment,
this interval can be longer).
1. Remove any cuvettes and cuvette/sample cell adapter from the
cell compartment.
2. Turn the instrument off.
3. Unplug the power cord.
4. Lift the instrument and check the color of the filter mat. Replace
the filter mat if is dark gray or black.
7.3.1 Filter pad replacement
5. Turn the instrument over and place it on a soft surface.
6. Use a screwdriver (standard or cross-head) to open the
filter grid ( Figure 11 , item 1 ).
7. Lift the filter grid ( Figure 11 , item 1 ).