16
Pyxis SP-900 provides 6 LED wavelengths and can measure absorbance values at
multiple LED wavelengths. Consequently, Pyxis SP-900 can provide many predefined
advanced methods that traditionally require complex and often expensive lab testing
procedures.
Low range, direct reading chlorine dioxide, 0 to 35.0 ppm
The maximum absorption bank of aqueous chlorine dioxide is around 360nm. Pyxis
SP-900 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 Pyxis SP-900.
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.
Turbdimetric 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.
4.8 Method Setup and Calibration
Press the SETUP button in the method result page to launch the method setup and
calibration page.
4.8.1. Set up the method parameters
Press the FORM button to select a concentration form from the list of forms
that are available for this specific method (Figure 16).
Press the UNIT button to select a concentration unit among the list of ppb,
ppm, mg/L, and ug/L (Fihure 17).
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