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EN-20
5.
Optionally, The AP50MMcan be re-zeroed using the prepared blank after the
timing step is completed or terminated. The blank reading will be subtracted
from the measured concentration value, and the displayed concentration
value on the top-right corner will be updated. This step is optional. It is only
necessary if the prepared blank changes its color during the timing period.
5.7. Advanced Methods
The AP50MM provides 7 LED wavelengths and can measure absorbance values at
multiple LED wavelengths. Consequently, the AP50MM can provide many predefined
advanced methods that traditionally require complex and often expensive lab testing
procedures.
5.7.1. Low range, direct reading chlorine dioxide, 0 to 35.0 ppm
The maximum absorption bank of aqueous chlorine dioxide is around 360nm.The
AP50MM has a 365nm UV LED and can be used to directly measure chlorine dioxide.
It offers a much lower detection limit (0.2 ppm) than direct methods available from other
portable colorimeters having only light sources in the visible range.
Select ClO2D in the method selection page and carry out the following steps to measure
chlorine dioxide:
1.
Place a vial filled with deionized water into the vial compartment and press the
ZERO button to zero the AP50MM.
2.
Discard the deionized water and fill the same vial with the sample. Place the vial
into the vial compartment and press READ button to read. The measured chlorine
dioxide concentration will be displayed in the top of the method page.
5.7.2. Turbidimetric Anionic Polymer Method
1.
Add polymer reagent 1 to 10 ml sample and inverse the sample vial 5 times to mix
the reagent with the sample. Place the sample via to the sample vial compartment.
2.
Press on ZERO.
3.
Add polymer reagent 2 and press on TMR1 to start the five minutes timer.
4.
Gently inverse the sample via for 10 times and place the sample vial to
the sample vial compartment.
5.
Polymer concentration will be measured and displayed when the five-minute
timer is reached. The polymer concentration is shown as ppm PAA (polyacrylic
acid) equivalent.
5.7.3. Direct Reading Bleach Percent Method, 0 to 15%
The AP50MM has a 365nm UV LED and other deep blue LEDs that can be used to
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