wtw Turb 555, Operating Manual

Page: 64 / 82

Maintenance, cleaning, disposal Turb 555 / Turb 555 IR
64 ba41113e07 04/2009
5.2 Cleaning
5.2.1 Cleaning the measuring instrument
Occasionally wipe the outside of the measuring instrument
with a damp, lint-free cloth. Disinfect the housing with iso-
propanol as required.
CAUTION
Avoid contact with acetone or similar detergents that
contain solvents as these can damage the housing. Re-
move any splashes immediately.
5.2.2 Cleaning the cuvettes
Cuvettes used for measuring turbidity must be clean. There-
fore, clean them regularly:
Note
Scratches in the glass change the optical characteristics of
the cuvette and falsify the measured value. For this reason,
never use scratched cuvettes!
6 Insert the new lamp module (lamp symbol must be
vertical), so that it locks into place and a click can be
heard.
7 Connect the instrument to the mains supply and
switch it on.
8 Calibrate the instrument (see section
4.4 C
ALIBRATION
). The instrument is now ready for
operation again.
1 Clean the cuvettes inside and out with hydrochloric
acid or laboratory soap.
2 Rinse out several times with distilled water.
3 Let them dry in the air.
4 Only hold the cuvettes by the top or by the light pro-
tection cap so that the optical path is not impaired.