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10. Zero adjustment
Only perform the zero adjustment against
distilled water in an optically perfect cell.
– Press
1
– In the setup menu, call up the meter setup submenu.
The following display appears:
– Call up the zero adjustment submenu with
3
.
– Insert a cell with distilled water.
The message, measuring..., appears on the display.
Successful zero adjustment
10
Zero adjustment
Zero adjustment is necessary
l
after changing the lamp
l
after the error message, PhotoCheck (AQA1)
occurs
l
on initial commissioning
l
if the photometer was mechanically stressed, e.g.
percussion, transport
l
if the ambient temperature changed by more than
5 °C since the last zero adjustment
l
at least every six months.
When performing the zero adjustment observe the
following points:
l
Only use a clean, scratch-free round cell with
distilled water. A prepared zero cell is provided with
your photometer. In addition, a prepared zero cell
is contained in the scope of delivery of the Photo-
Check (article 14693).
l
If the round cell is visibly contaminated, or at least
every 24 months, clean and refill it (minimum filling
level 20 mm). Then check the cell for scratches.
After approx.
2 s:
