wtw Avantor VWR pH 1100 L Operating Manual page 62

What to do if...
No stable measured
Sensor symbol flashes
Display
62
Cause
value
pH electrode:
– Junction contaminated
– Membrane contaminated
Test sample:
– pH value not stable
– Temperature not stable
Electrode + test sample:
– Conductivity too low
– Temperature too high
– Organic liquids
Cause
– Calibration interval expired
Cause
– Batteries almost empty
Remedy
– Clean the junction
– Clean membrane
– Measure with air excluded
if necessary
– Adjust temperature if nec-
essary
– Use suitable electrode
– Use suitable electrode
– Use suitable electrode
Remedy
– Recalibrate the measuring
system
Remedy
– Replace the batteries (see
section 6.1 M
AINTENANCE
ba77068d05
pH 1100 L
)
05/2021