Trace2O HT1000 - Page 46

46
HT1000_0.5 09/2015
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