User guide

What to do if... HandyLab 600
60 ba77064e01 03/2014
No stable measured
value
Obviously incorrect
measured values
11.2 General information
Sensor symbol
flashes
Display
Cause Remedy
IDS pH sensor:
– Junction contaminated – Clean junction
– Membrane contaminated – Clean membrane
Test sample:
– pH value not stable – Measure with air excluded if neces-
sary
– Temperature not stable – Adjust temperature if necessary
IDS pH sensor + test sample:
– Conductivity too low – Use suitable IDS pH sensor
– Temperature too high – Use suitable IDS pH sensor
– Organic liquids – Use suitable IDS pH sensor
Cause Remedy
IDS pH sensor:
– Sensor unsuitable – Use suitable IDS sensor
– Temperature difference
between buffer and test sample
too great
– Adjust temperature of buffer or sam-
ple solutions
– Measurement procedure not
suitable
– Follow special procedure
Cause Remedy
– Calibration interval expired – Recalibrate the measuring system
Cause Remedy
– Batteries almost empty – Replace the batteries (see section
10.1 M
AINTENANCE, page 57)