Hach POCKET COLORIMETER II, Instruction Manuals

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Chlorine Dioxide,
continued
• Use a timer for reagent reaction and be consistent for all samples.
• Gently swirl samples to mix reagents. Do not shake sample cells or ampules. Do
not invert sample cells. AccuVac Ampuls can be inverted as they contain little air.
Vigorous agitation may cause loss of volatile chlorine dioxide before it can react.
• Allow any unreacted reagent to settle before taking readings.
• For best accuracy when using AccuVac Ampuls, draw sample into an empty
AccuVac ampule (Cat. No. 26779-25) and use that for the zero instead of a 10-mL
sample cell.
• Check the reagent blank for each new lot and at least every two months. Make this
adjustment by using deionized water in the procedure instead of sample and
subtract that reading from future test results.
Note:
The Pocket Colorimeter™ II is designed to measure solutions contained in sample cells.
DO NOT
dip the meter in the sample or pour the sample directly into the cell holder.