Myron-l PS6FCE User Manual download pdf (Page 49)

C. Free Chlorine

1. Free Chlorine as an Indicator of Sanitizing Strength

Chlorine, which kills bacteria by way of its power as an oxidizing agent,

is the most popular germicide used in water treatment. Chlorine is not

only used as a primary disinfectant, but also to establish a sufcient

residual level of Free Available Chlorine (FAC) for ongoing disinfection.

FAC is the chlorine that remains after a certain amount is consumed by

killing bacteria or reacting with other organic (ammonia, fecal matter)

or inorganic (metals, dissolved CO

, Carbonates, etc) chemicals in

solution. Measuring the amount of residual free chlorine in treated

water is therefore the best method for determining its effectiveness in

microbial control.

The Myron L Company FC

method for measuring residual disinfecting

power is based on ORP, the specic chemical attribute of chlorine (and

other oxidizing germicides) that kills bacteria and microbes.

2. FC

Free Chlorine Units

The PS6FC

is the rst handheld device to detect free chlorine directly,

by measuring ORP. The ORP value is converted to a concentration

reading (ppm) using a conversion table developed by Myron L Company

through a series of experiments that precisely controlled chlorine levels

and excluded interferants.

Other test methods typically rely on the user visually or digitally

interpreting a color change resulting from an added reagent-dye. The

reagent used radically alters the sample’s pH and converts the various

chlorine species present into a single, easily measured species. This

ignores the effect of changing pH on free chlorine effectiveness and

disregards the fact that some chlorine species are better or worse

sanitizers than others.

The Myron L Company PS6FC

avoids these pitfalls. The chemistry of

the test sample is left unchanged from the source water. It accounts

for the effect of pH on chlorine effectiveness by including pH in its

calculation. For these reasons, the PS6’s FC

feature provides the best

reading-to-reading picture of the rise and fall in sanitizing effectivity of

free available chlorine.

The PS6FC

also avoids a common undesirable characteristic of other

ORP-based methods by including a unique Predictive ORP value in

its FC

calculation. This feature, based on a proprietary model for

ORP sensor behavior, calculates a nal stabilized ORP value in 1 to

2 minutes rather than the 10 to 15 minutes or more that is typically

required for an ORP measurement.

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Myron-l PS6FCE User Manual Page 49

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