XD 7500
Maintenance and cleaning
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04/2018
5.2.3
Cleaning the detector lens
Normally, it is not required to clean the detector lens routinely. Cleaning the
detector lens can be necessary in the following cases:
If the lens is visibly smudged, e.g. after a cell has broken or after a reagent
accident (see also Section 6.1 A
).
If, due to environmental influences or reagent contamination, the photom-
eter displays the message,
Wavelength calibration
during the self-test
after being switched on (see Section 6.2)
Proceed as follows to clean the detector lens:
If the lens is often smudged (error,
Wavelength calibration
during
the self-test), check whether the correct operating conditions are
observed. Follow the details in Section 3.2 for this purpose.
The detector lens is on the front left
side of the rectangular cell shaft
(pos. 1).
1
Switch off the photometer.
2
Cut off one end of a customary
cotton swab (approx. 2 cm).
3
Grasp the cut-off end with the tip
of a pair of tweezers or small pli-
ers. Clean the lens with the dry
head of the cotton swab. To do so,
move the head from the center of
the lens outward in circles. If there
are persistent coatings, moisten
the cotton swab with a little deion-
ized water or isopropanol.
After recommissioning, carry out the photometer monitoring for
all measurements (see Section 4.15.2 C
