MIOX RIO Series Operators Manual
P/N: 102-00076-G Page 72
Procedure
Stagger preparation of each dilution by several minutes to allow enough time for accurate
analysis of FAC at each dilution. FAC readings should be taken at the following times: T = 0,
30 minutes, 60 minutes, and 90 minutes. Readings beyond 90 minutes are determined by
interpretation of data from the first 90 minutes.
• Accurately measure the volume (mL) of calculated sample water and place in a
glass jar.
• Accurately measure the volume (mL) of oxidant required.
• Add oxidant to sample water jar and swirl briefly to mix.
• Immediately measure and record the FAC concentration and time the reading is
taken (time = 0).
• Repeat the above steps for the other dilutions, measure each at time = 0 before
preparing the next dilution, and then take FAC readings at 30, 60, and 90 minutes.
Generate a table similar to the one given in the example below.
Example:
Fill out the table properly and completely. The oxidant solution must be diluted to 1 ppm, 3
ppm, and 5 ppm doses as determined in the previous example. The FAC residual is
measured in 30-minute intervals until the chart is filled out as below (measurements are
based on assumed tests for this example):
Sample A
(1 ppm)
Time
(o’clock)
Sample B
(3 ppm)
Time
(o’Clock)
Sample C
(5 ppm)
Time
(o’Clock)
t = 0 0.4 12:00 2.1 12:05 4.0 12:10
t + 30
min.
0.08 12:30 2.0 12:35 2.5 12:40
t + 60
min.
0.0 1:00 2.0 1:05 2.5 1:10
t + 90
min.
0.0 1:30 1.8 1:35 2.4 1:40
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