Myron L PS6 - Manual (Page 47)

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