Myron L 6Pfc and 4P User 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.

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