MIOX AE Series Operators Manual
102-00085-E Page 47
5. If there is no chlorine residual in the water, add another 3 mL, and wait another thirty minutes.
6. If there is a chlorine residual, record the value and wait another 15 minutes.
7. Check the chlorine residual again. If the chlorine value is the same as the last reading, the chlorine
demand in the water has been met and the water is stable.
8. If the chlorine value is different than the last reading, wait 15 minutes and check it again. Repeat
this procedure until the chlorine residual is stable.
9. Record the final chlorine residual value for use in the analysis that follows.
Measuring Chlorine Concentration
1. Fill the 250 mL glass beaker with approximately 200 mL of oxidant to be tested.
2. Rinse the jar several times with chlorine demand-free water and then fill to the 2500 mL, or 5000 mL
line with demand-free water, depending on which dilution technique you are using:
• MIOX Series Systems: Use a 1:2500 ratio (= 1.0 mL solution to 2500 mL water or 2 mL
solution to 5000 mL water.)
• HYPO Series Systems: Use a 1:5000 ratio (= 1 mL solution to 5000 mL water)
3. Rinse the pipette several times by drawing in several mL of oxidant and discarding it.
4. With the pipette, accurately measure the solution sample needed (according to the dilution technique
used above) and add to the jar containing demand-free water.
5. Cap and shake the jar several seconds to mix thoroughly.
6. Using the solution from the jar, take a reading by following the directions provided with the test kit.
7. For demand-free water created using:
• Method One (no chlorine residual in water): For the chlorine residual value obtained in step
#6 above, multiply by the dilution ratio used in step #2.
Example: The chlorine reading from Step #6 was 1.75 mg/l, and the dilution ratio used was
1:2500. Chlorine concentration is:
1.75 mg/L x 2500 = 4375 mg/L
• Method Two (chlorine residual present in dilution water): Subtract the chlorine residual value
obtained in step #6 above by the chlorine residual value measured in the demand- free water to
determine the net chlorine value. Next, multiply this net chlorine value by the dilution ratio from
Step #2 to get the chlorine concentration of the oxidant.
Example: The chlorine reading from Step #6 was 2.25 mg/L, the chlorine residual measured in
the demand-free water was 0.5 mg/L, and the dilution ratio used was 1:2500. Chlorine
concentration is:
2.25 mg/L – 0.5 mg/L = 1.75 mg/L net
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