Functional Description; General Information; Start-Up - ProMinent DULCOTEST DT3 Instrucciones De Servicio

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Functional Description

1.1 General Information

The DT3 photometer is used for determining hydrogen peroxide
concentration. It features two measuring ranges:
- Low range: 1 - 50 ppm
- High range: 40 - 500 ppm (Symbol in display "Hr")
The hydrogen peroxide is determined in the form of yellow/oran-
ge coloured peroxotitanic acids in strongly acidic media. In
connection with neutral to weakly alkaline (~pH 10) samples, the
acid in the reagent is sufficient in order to produce a medium
suitable for measurement. In the case of strongly alkaline samples
(pH > 10), the samples must be acidified before measurement
otherwise the results may be deficient. This is achieved by diluting
the sample with a 5% sulphuric acid solution, for example, at a
ratio of 1:1. In contrast to many other colour reactions, in
connection with the presence of hydrogen peroxide, discoloration
with long-term stability is achieved that can still be measured
after 24 h. Particles in the sample solution or turbidity distort the
analysis and must be eliminated by centrifuging or simply filtering
the sample solution prior to performing the measurement.
Falsification of the measurement results should also be expected
in connection with coloured solutions.

1.2 Start-Up

- Open battery compartment.
- Place 9 V block battery correctly aligned in the battery
compartment and close the compartment.
- Connect sample chamber for 16 mm round vials to the
photometer.
(Symbol in display "Lr")
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