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Myron L PS6 User Manual

Page 47

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43

XXV. ADDENDUM: New ORP ppm Free Chlorine Feature

For Software V.4.2.1 and later (see pg. 41). Earlier versions

may be upgraded. Contact the Myron L Company for more

information: www.myronl.com

A convenient new feature has been added to the P

OOL

P

RO™

that allows

the user to choose between ORP millivolts (mV) and parts per million

(ppm) free chlorine readings. mV and ppm free chlorine are the two

most commonly used sanitizer measurement units in the pool and spa

industries. The P

OOL

P

RO

mV to ppm free chlorine conversion algorithm

is based on a published conversion curve that assumes a pH of 5-9

in water sanitized by chlorine only

and bench testing performed at the

Myron L Company. We have increased the accuracy of low-range ppm

free chlorine readings by extrapolating from the published data. With

this new feature the P

OOL

P

RO

can measure a dynamic range of sanitizer

concentrations that is wider than the range of a colorimetric test kit.

Additional ORP Specifications

Spec

Value

Ranges

± 999 mV

0.2 – 9.9 ppm

Resolution

mV resolution: 1 mV

ppm resolution: 0.1 ppm

Accuracy

± 1 mV

± 2.5% of reading ppm*

*Given water is sanitized by only chlorine at a pH of 5-9

NOTE: FOR COMPLETE INSTRUCTIONS ON MEASURING ORP,

REFER TO MEASURING ORP, PG. 10, IN ThE OPERATION MANUAL.

To change the ORP measurement format preference:

1.

Press .

2.

Press and hold

for approximately three seconds.

The current preference for ORP units of measure is displayed.

Factory setting for this preference is mV. (Shown below.)

mV