Care and maintenance
60
Edition 01/2014
contrAA 600
2.
Unscrew the sensor cable of the level monitor (1 in Fig. 37) at the lid of the cooling
water container.
Caution
: Always unscrew the sensor cable before unscrewing the lid. The sensor cable
must not be twisted.
3.
Unscrew the lid of the cooling water container (2 in Fig. 37).
4.
Fill the cooling water container with tap water up to 2 cm above the top edge of the
square container.
5.
Screw down the lid hand-tight.
6.
Attach the cover plate with screws.
7.5
Maintaining the graphite tube furnace
After a prolonged operation time, sample residues, modifiers and sublimated carbon parti-
cles of the graphite tube are deposited on the contact surfaces of the graphite electrodes,
the furnace jacket, the radiation sensor and the pipetter insert. These deposits can be a
source of contamination and can lead to increased deviations of the formatting factor.
A damaged furnace jacket, ceramic ring and graphite tube can be the cause of substandard
analysis results.
CAUTION! THERE IS A RISK OF BURNING YOURSELF ON THE HOT
GRAPHITE TUBE FURNACE!
Allow the graphite tube furnace to cool down before attempting any service or maintenance
work.
CAUTION! DO NOT DAMAGE THE FURNACE WINDOW!
Do not touch the quartz panes of the furnace windows with your bare fingers!
Fingerprints burn in.
7.5.1
Cleaning the furnace windows
CAUTION!
Do not clean the furnace windows in an ultrasonic bath. This may lower the UV permeability
of the windows.
Do not touch the quartz panes of the furnace windows with your bare fingers! Fingerprints
burn in.
Danger of brittleness for rubber seals. When cleaning the furnace windows with alcohol,
make sure that the rubber seals do not come in contact with the alcohol.
IMPORTANT
After cleaning the sample chamber window with alcohol, it takes approx. 1 h until the com-
plete UV transmission has been restored.
Only use cleaning solution for cleaning (order no. 407-320.002).
Preparation of the cleaning solution: Use a mixture of demineralized water and 1 vol% clean-
ing solution.
