Xylem WTW Multi 3430, Руководство по эксплуатации

Страница: 121 / 134

What to do if...
Multi 3430
121
ba75865e19 04/2015
No stable measured
value
Obviously incorrect
measured values
6.3 Dissolved oxygen
Error message,
OFL
Cause Remedy
IDS pH sensor:
– Junction contaminated – Clean junction
– Membrane contaminated – Clean membrane
Test sample:
– pH value not stable – Measure with air excluded if
necessary
– Temperature not stable – Adjust temperature if neces-
sary
IDS pH 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:
– IDS pH sensor unsuitable – Use suitable IDS sensor
– Temperature difference
between buffer and test sample
too great
– Adjust temperature of buffer
or sample solutions
– Measurement procedure not
suitable
– Follow special procedure
Cause Remedy
– Measured value outside the
measuring range
– Select a suitable measuring
medium