Deckma Hamburg OMD-2005 Instruction Manual page 21

DECKMA HAMBURG GmbH
Important Information!
Cleaning of Glass Tube at 15 ppm Bilge Alarms OMD-2005
IMPORTANT:
NEVER DISASSEMBLE THE UNITS AS THIS MAY VOID THE
CALIBRATION AND THE CERTIFICATION!
CLEANING HAS ONLY TO BE DONE TROUGH THE REMOVED CELL CAP BY
USING THE CLEANING BRUSH!
In most cases of high reading with clean water the measuring cell has a problem with
internal coating of the glass tube. Just cleaning with brush and clean water will not help
in this case.
Please carry out the following instructions to make sure, that the glass tube is really
clean. Than the unit will show 0 to 2 ppm with clean water.
Remove the desiccator of the measuring cell and check the colour. It should be blue or
light blue. If it is more white, it needs to be changed, as the humidity inside the
measuring cell might be too high and creates condensation around the glass tube which
leads to high readings.
Looking through the hole of the removed desiccator a small part of the glass tube is
visible. Please check if it is really clean and clear.
If not, replace the desiccator to avoid humidity or water inside the measuring cell and
clean the glass tube by using the cleaning brush under assistance from some cleaner.
If there is some brown coating visible at the glass tube, it could be iron oxide. In this
case some citric acid, juice from a fresh lemon or vinegar may help, if you fill it into the
glass tube and leave it at least over night before using the cleaning brush for removing
the last dirt from the glass tube. Make sure, that the cleaning fluid will stay in the tube
and is not draining. Sometimes the cleaning with citric acid or vinegar has to be doen 2
or 3 times for at least 12 hours, depending on the thickness of the coating.
Additional use of some slightly abrasive cleaning powder or tooth paste may also assist
in cleaning.
Issue: 27.05.08 Instruction Manual OMD-2005 Page 21 of 25