Minifors 2 - Benchtop Bioreactor
Interferences
Page
200
of
214
07 February 2019
12.6 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.
Check the sensor cable, connect it properly if neces-
sary.
Operator
Faulty pO
2
sensor.
Consult the documentation of the sensor manufac-
turer.
Check the calibration of the pO
2
sensor.
Replace the sensor if necessary.
Operator
Interference
No pO
2
control.
Possible cause
Remedy
Remedied 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.
See faults in the gassing system.
Operator
Fault with control of gas mixing unit. Check connections.
Check gas lines.
Operator
Interference
Unstable pO
2
control
Possible cause
Remedy
Remedied 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
