ProMinent DULCOTEST DT1B Operating Manual page 41

8.
Measuring tolerances
when determining pH:
up to ± 0.3 pH units
–
Analysis methods
ð
Remarks:
For the photo‐
–
metric pH value
determination
only use
[PHENOL RED]
tablets with black
foil printing, which
are labelled with
the term
[PHOTOMETER].
Water samples
–
with low carbo‐
nate hardness*
may result in
incorrect pH
values.
*KS4.3 < 0.7
mmol/l ≜ Total
alkalinity < 35
mg/l CaCO
pH values under
–
6.5 and greater
than 8.4 may lead
to results within
the measuring
range. A plausi‐
bility test (pH
meter) is recom‐
mended.
The accuracy of
–
pH values based
upon colorimetric
determination
depends on var‐
.
3
41