User Manual

Multi 3500i What to do if...
87
Measured value too
high
Sensor symbol flashes
6.4 Conductivity measurement
Conductivity
measuring cell
was not recognized
Error message, Error
(invalid
calibration)
Sensor symbol flashes
Cause Remedy
– High amount of dissolved
substances
– Correct solubility function
using the salinity equivalent
– Air bubbles bump on the
membrane with high velocity
– Avoid direct flow to the
membrane
– The carbon dioxide pressure is
too high (> 1 bar)
– Measuring not possible
Cause Remedy
– Calibration interval expired – Recalibrate the measuring
system
Cause Remedy
– Measuring cell not connected – Connect measuring cell
– Cable broken – Replace measuring cell
Cause Remedy
– Measuring cell contaminated – Clean cell and replace it if
necessary
– Unsuitable control standard – Use control standard,
0.01 mol/l KCl
Cause Remedy
– Calibration interval expired – Recalibrate the measuring
system