Labfors 5 – Version for Microorganisms
Interferences
22 January 2019
Page
183
of
205
Interference
No pH control.
Possible cause
Remedy
By
Parameter
pH
is not activated.
Activate the
parameter.
Operator
Incorrect dead band setting.
Check the dead band (Dead Band in PID settings):
Switch off or enter a small value.
Operator
No addition of reagents (acids and
base).
Check the reagent bottles: Refill if necessary.
Check the hose connections between the reagent
bottles and the culture vessel:
Connect properly if necessary.
Open/remove hose clamps if necessary.
Operator
Pump(s) (base/acid) do/does not op-
erate properly.
Check operation using the rocker switch.
Operator
Pump hose is damaged.
Replace pump head.
Operator
Incorrect hose type connected.
Replace if necessary.
Operator
Interference
pH value drifts up and down over time or acid and base are added almost continuously in turn.
Possible cause
Remedy
By
Incorrect PID setting in
pH
parame-
ter.
Check the PID settings and adjust as necessary.
Change the special proportional factor (
Prop. Term)
or
Dead band
setting.
Operator
Incorrect strength of reagents: Con-
centration is too weak or too strong.
Check the strength of reagents. Adjust if necessary:
0.1 mol to 2.0 mol.
Operator
11.6 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.
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
Содержание Labfors 5
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