Display Possible Causes Elimination
???
Example 1
0,60 mg/l free Cl
??? comb Cl
0,59 mg/l total Cl
Example 2
Underrange
??? comb Cl
1,59 mg/l total Cl
Example 3
0,60 mg/l free Cl
??? comb Cl
Overrange
The calculation of a value
(e.g. combined Chlorine) is
not possible
Test procedure correct?
If not – repeat test
Example 1:
The readings for free and total
Chlorine are different, but
considering the tolerances of
each reading they are the same.
For this reason the combined
Chlorine is most likely zero.
Example 2:
The reading for free Chlorine
is under the detection limit.
The instrument is not able
to calculate the combined
Chlorine. In this case the
combined Chlorine is most likely
the same as the total Chlorine.
Example 3:
The reading for total Chlorine
is exceeding the range.
The instrument is not able
to calculate the combined
Chlorine. The test should be
repeated with a diluted sample.
Error absorbance
e.g.: T2>T1
Fluoride calibration was not
correct
Repeat calibration
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