Deckma Hamburg OMD-2008 - 12.6 Removal of Iron Oxide Layer with Citric Acid; 13 Fault finding

DECKMA HAMBURG GmbH
Issue: 25.09.2015 preliminaryInstruction Manual OMD-2008 (All Versions) Page 34 of 28
12.6 Removal of Iron Oxide Layer with Citric Acid
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. Iron Oxide can not be removed mechanically. It is recommended to remove
it chemically.
Iron Oxide can be converted into a water soluble compound using Citric Acid.
Citric Acid is commonly used to remove calcite from Coffee Machines. Fill some
Citric Acid into the drained Sample Glass Tube, add water, and let it soak
overnight (the reaction takes some time). Flush with clean water.
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.
13 Fault finding
See Section 2 for important notes.
The OMD-2008 EV-FC will indicate several malfunctions in the status line of the
display. Pressing the “OK” button will lead into an information window, similar to
the items listed in the table below.
S
t
a
t
u
s
R
ea
di
ng
Syst
em-
Alar
m-
LED
Alarm-
circuit
1,2
Reason Servicing
O
K
0..
49
Gree
n /
Blinki
ng
Norma
l
operati
on
Normal
operation
-
O
K
E
E
Gree
n /
Blinki
ng
Alarm Sample
reading is
out of
range:
Oil content
too high,
dirty
sample
tube
Wait until oil
content is
within the
range, clean
sample tube