Possible Distortion - ProMinent DULCOTEST DT3 Instrucciones De Servicio

Methods
Note:
If "HI" is shown in the display instead of a result, this indicates
that the measuring range has been exceeded. The analysis should
then be repeated after diluting the sample solution with a defined
quantity of distilled water. In this case, the indicated result must
be corrected by the dilution factor.
To repeat the analysis:
Zero
Test
Press the ZERO/TEST key again.
Measurement accuracy: approx. 5% from end of measuring
range

2.3 Possible Distortion

Oxidising agents such as chlorine, bromine, chlorine dioxide and
ozone do not distort the analysis. On the other hand, however,
water discoloration does distort the analysis. In this case, proceed
as described in the following: determine the zero point with distilled
water. Then first measure the sample solution without the addition
of drops of reagent (value B). Subsequently measure the same
sample solution but this time add the drops of reagent (value A).
An approximate value of the hydrogen peroxide concentration
can then be obtained by subtracting value B from value A.
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