Labfors 5 – Version for Microorganisms
Interferences
Page
182
of
205
22 January 2019
Interference
Sudden increase in evaporation losses in the culture vessel.
Possible cause
Remedy
By
The exit gas cooler does not cool.
The control valve for water flow is
closed.
Open the control valve.
Operator
The exit gas cooler does not cool,
parameter
Temperature
is activated.
Check the water supply to the exit gas cooler. Re-
store it, if necessary.
The basic unit is calcified. Decalcify the equipment,
if necessary.
Operator
11.5 Interferences pH-System
Interference
No display or incorrect display of pH
Possible cause
Remedy
By
Sensor cable not connected or not
properly connected.
Connect properly if necessary.
Operator
Measuring system METTLER (ana-
logue)
Function
Temperature compensation
is not activated.
Activate this function in option
Setpoint
of parameter
pH
1
.
Operator
pH drift during long cultivation.
Recalibrate pH with offline values. Refer to the sepa-
rate operating manual of the touch screen software
for details:
(Analogue) measuring system METTLER: chapter
“Recalibrating a METTLER pH Sensor”.
(Digital) measuring system HAMILTON: chapter
“HAMILTON pH Sensor Product Calibration”.
Operator
Faulty pH-sensor.
Test calibration with pH 4 and pH 7 buffer.
Regenerate or replace the sensor.
Consult the documentation of the sensor manufac-
turer!
Operator
1)
This does
not apply
to the measuring system HAMILTON (digital):
this function
MUST
be
deactivated
there!!
Содержание Labfors 5
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