wtw pHotoFlex, Operating Manual

Page: 92 / 111

What to do if... pHotoFlex / pHotoFlex Turb
92 ba75491e05 04/2009
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