Labfors 5 – Version for Microorganisms
Setup and Function
Page
44
of
205
22 January 2019
the oxygen measurement is always calibrated to a relative refer-
ence point. For this purpose, the calibration is set to 100 % relative
oxygen saturation, usually with air at max. stirring speed and maxi-
mum gas flow rate. The actual concentration of dissolved oxygen
in mmol/L may therefore vary at 100 % saturation, depending on
the process.
INFORMATION
Calibration is always carried out
AFTER
autoclaving. This is car-
ried out on the touch screen operating unit. Depending on the
specifications defined by the user, the pO
2
sensor will be cali-
brated either before the vessel is filled with medium or after-
wards, in the prepared medium.
For details about calibration refer to the separate operating manual
of the touch screen software.
3.9.3 Mounting of the Sensor
pO
2
sensors are mounted into a 12 mm / Pg13.5 port by the means
of an electrode holder. For details see main chapter “Accessories”,
chapter “Electrode Holder”.
3.10 Antifoam Control
Foam hinders the exchange of gas between the medium and the
gas phase in the head space. The exit gas filter can become
clogged with foam, which causes a pressure build-up in the vessel.
This can be prevented by adding antifoam agent.
The antifoam agent is kept in a reagent bottle that is connected to
the antifoam sensor and the antifoam pump via a hose. The sensor
also acts as a dosing needle. When the sensor comes in contact
with foam, the antifoam pump is activated and antifoam agent is
fed into the vessel via the dosing needle.
INFORMATION
The antifoam sensor is separately available, it is NOT included
in the standard packages. For details refer to main chapter “Ac-
cessories”, chapter “Antifoam Sensor”.
Содержание Labfors 5
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