Important Information: Cleaning Of Glass Tube - Deckma Hamburg OMD-2008 Instruction Manual

DECKMA HAMBURG GmbH
Important Information!
Cleaning of Glass Tube at 15 ppm Bilge Alarms OMD-2008 series
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. Then the unit will show 0 to 2 ppm with clean water.
Check Measuring cell humidity readings and desiccator status. Desiccator status must
be OK and dewpoint should be considerably lower then both sample temperature and
clean water temperature. If not, change desiccant container and allow new desiccator to
absorb the humidity inside the measuring cell.
Clean the glass tube by using the cleaning brush under assistance from some cleaner.
In certain cases iron oxide can be deposited inside the glass tube (brownish surface
deposit on the glass tube), depending on environmental conditions on site. In this case
some citric acid, juice from a fresh lemon 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. Also, in cases of calceous deposits in the glass tube, treatment with
some mild acidic cleaner, citric acid, may allow removal of the deposits. Make sure, that
the cleaning fluid will stay in the tube and is not draining. Sometimes the cleaning with
citric acid has to be done 2 or 3 times for at least 12 hours, depending on the thickness
of the coating.
Additional use of tooth paste may also assist in cleaning as a last resort. Do not use
abrasive cleaners containing hard particles. Hard abrasive particles may scratch the
glass surface, permanently damaging the instrument.
Issue: 08.07.2015 Instruction Manual OMD-2008 (EV, FC, MCU Versions) Page 23 of 28