MIOX RIO Series Operators Manual
P/N: 102-00076-G Page 74
Chlorine Production Testing
Calculating chlorine production alone is the easiest way of checking the performance of a
MIOX mixed-oxidant or MIOX sodium hypochlorite system. A cell yielding a reading of 3200
ppm when it should be reading 3600 ppm may not be old and depleted -- the flows may
also be high.
Total Chlorine Production = Chlorine Concentration X Volumetric Flow per
unit time
Follow the steps below to correctly determine the total chlorine production of the system.
Equipment Needed
• 250 mL glass beaker
• 3000 mL, or 5000 mL glass jar with lid (depending on MIOX OSG being tested)
• Pipette that can accurately measure 0.5 mL or 1 mL samples
• Chlorine Test Kit (i.e. DPD, Color Wheel, Colorimeter or AccuVac)
• Chlorine Demand-Free Water (see below)
• Graduated Cylinder (1000 mL for MIOX and RIO Series mixed-oxidant or sodium
hypochlorite systems)
• Timer or a watch with a second hand
• Calculator
Preparing Chlorine Demand-Free Water
Demand-free water is required for determination of oxidant concentration in an on-site
generator. Because the oxidant is being diluted significantly, any demand in the dilution
water will cause a significant misreading in the oxidant concentration. There are two
methods for making demand-free water. The first, and preferred, method requires UV
exposure over an extended period and may not be practical for quick analysis. The second
method is quicker, but the calculations must be modified to account for the excess chlorine
residual in the water.
Note: Distilled water, whether purchased at the store or made in a lab, cannot be
trusted to be demand-free.
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