Multifors 2 - Parallel Bench-top Bioreactor
Interferences
28 March 2018
Page
205
of
211
10.4 Interferences pO
2
System
Interferences
No display or incorrect display of pO
2.
Possible cause
Remedy
By
Sensor cable not connected or not
properly connected.
Connect properly if necessary.
Operator
pO2 sensor is not calibrated
Calibrate the pO
2
sensor. Refer to the separate op-
erating manual of the touch screen software for de-
tails.
Operator
Measuring system METTLER (ana-
logue)
pO2 sensor is not polarised.
Polarise the pO
2
sensor
Operator
Faulty pO
2
sensor.
Check the calibration of the pO
2
sensor.
Consult the documentation of the sensor manufac-
turer.
Operator
Interference
No pO
2
control.
Possible cause
Remedy
By
The
pO
2
parameter and/or cascaded
parameter is/are
not activated.
Activate parameters.
Operator
The cascade settings are incorrect. Check the cascade settings and change as neces-
sary.
Operator.
No gas flow into culture vessel.
Refer to interferences in the gassing system.
Operator
Interference
pO
2
value fluctuates strongly or the stirrer speed fluctuates.
Possible cause
Remedy
By
Incorrect PID settings in the
pO
2
pa-
rameter.
Check the PID settings (
PID
parameter option) and
adjust as necessary. Special proportional factor
(
Prop. Term
) and dead band. Dead band value must
be 0 (zero).
Operator
