4 turbidity, Turbidity – Xylem pHotoFlex/pHotoFlex Turb User Manual
Page 90
What to do if...
pHotoFlex / pHotoFlex Turb
90
ba75491d04
07/2006
Obviously incorrect
measured values
Sensor symbol flashes
6.4
Turbidity
Error message
Measured values
obviously incorrect
Measured value display
< 0.01 FNU
Cause
Remedy
pH electrode:
– Not connected
– Connect electrode
– Cable broken
– Replace cable or electrode
– pH electrode unsuitable
– Use suitable electrode
– Temperature difference
between buffer and test
sample too high
– Adjust temperature of buffer
or sample solutions
– Measurement procedure not
suitable
– Follow special procedure
Cause
Remedy
– Calibration interval expired
– Recalibrate the measuring
system
Cause
Remedy
– Cell not correctly inserted
– Lock cell into place
– Cell contaminated
– Clean the cell
– Calibration too old
– Carry out calibration
Cause
Remedy
– Measured value outside the
measuring range
– not possible