MiPNet19.01
B: OroboPOS service
23
OROBOROS INSTRUMENTS
O2k-Core Manual
B
B
•
Figure 4
. Mounting of a membrane onto the POS,
using the membrane mounting tool which consists of
two parts, the membrane guide and the membrane
ring holder.
No gas bubbles
should be trapped
in the electrolyte
reservoir
after
membrane
application. As a
check, you may
inspect
the
electrolyte
reservoir under a
binocular.
No
folds should be
visible
in
the
membrane in the
central
area.
Small folds in the
membrane near
the
outer
circumference
have no influence, but large folds should be avoided. Wash excess
electrolyte off the outside of the sensor and POS connector and wipe dry,
before attaching the POS connector to the POS holder at the O2k-Main Unit.
After sensor service and membrane mounting, the POS needs some
time in operation to stabilize while the O2k is switched on. Such
stabilization may require several hours. For this purpose the O2k may be
left on overnight.
4.
Electrical cable connection
Connect the POS cable to the O2k-Main Unit,
avoiding bending and torsions of the cable.
Insert the male plug of the POS cable into the
female connector next to the control light of the
stirrer. The red dot on the male plug has to face
accurately upwards when inserting the plug.
See Supplement for O2k Series B to C.
5.
Storage of the OroboPOS
5.1. Short-term storage in the Oxygraph-2k
For short periods of days or several weeks, the POS is stored in the
Oxygraph-2k chamber. The chamber is washed with distilled water and
completely filled with 70% ethanol for chemical sterilization. The stopper
is inserted loosely without pushing it down beyond the point where the
sealing ring is inserted into the glass chamber. This ensures a longer life
time of the sealing rings. The receptacle of the stopper is completely filled
with ethanol from the top, and is sealed with a black cover slip to avoid
