Myron L 6Pfc and 4P - Manual (Page 49)

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C. Free Chlorine
1. Free Chlorine as an Indicator
Chlorine is a germicide used in the disinfection of drinking water,
wastewater, and recreational waters. It is dissolved in water and reacts
with water to form the hypochlorite ion and hypochlorous acid, the
concentrations of which are directly dependent on pH.
Some chlorine is initially consumed by organic matter and metal
ions present in solution. The amount of chlorine a particular solution
consumes is called chlorine demand. The amount of chlorine that
remains beyond this initial consumption is called free chlorine. Enough
chlorine must be added to solution so that residual levels of free
chlorine have ongoing germicidal properties. The 6Pfc is designed to
measure these residuals.
The 6Pfc does NOT measure combined chlorine (compounds of chlorine
and nitrates that have no germicidal benefits), total chlorine (the sum of
free and combined chlorine), and chloramines (compounds of chlorine
and ammonia).
2. Free Chlorine Units
The 6Pfc converts Oxidation Reduction Potential measured in mV to ppm
free chlorine using a proprietary algorithm developed by the Myron L
Company. This algorithm is based on a conversion curve that assumes
a pH of 5-9 in water sanitized by chlorine only.
The Myron L Company has been able to increase the accuracy of low-
range ppm free chlorine readings through extensive bench testing.
This feature allows the 6Pfc to measure a dynamic range of sanitizer
concentrations that is wider than the range of a colorimetric test kit.
XXIV. SOFTWARE VERSION
Contact the Myron L Company to see if a software upgrade is available.
1.
Press key.
2. Press key until three
numbers are displayed as
Figure 35
shown in Figure 35.
3. Press key, instrument
will time out in ~15 seconds.