10
ABOUT
AccurAcy & cAlibrAtion
All tests have been calibrated using certified reference standards and
standard analytical spectrophotometric methods. The algorithms in
the software reflect the best correlation of the Pool eXact
®
EZ system
against the AWWA, US EPA , DIN, and ISO reference test methods
for chlorine. Studies show that the Pool eXact
®
EZ System repeatedly
agrees with an EPA Compliant reference method greater than 99%. The
Pool eXact
®
EZ meter Advanced Photometric System has been factory
calibrated and you can expect the fixed calibrations in the meter to be
valid for the life of the meter because of the quality, Long-Life LED, the
photo cell, and the software.
Free & totAl chlorine testing heAlth DepArtment compliAnce
This DPD test system for Chlorine is accepted for reporting by most
health departments because the test is USEPA (DIN Standard 38 408
G4, ISO 7393/2) accepted for testing requirements for Free and Total
Chlorine. The compliance requirement is a photometer wavelength to
measure between 490 and 530nm. The Pool eXact
®
EZ photometer uses
a 525nm wavelength. The eXact
®
Strip Micro CL (DPD-1) uses the same
reagents and proportions, and the resulting solution pH is maintained
between 6.2 and 6.5 as specified by AWWA method 4500-Cl G. The
USEPA does not “approve” commercial DPD delivery systems. The
eXact
®
Strip Micro CL (DPD-1) for Free Chlorine, and the eXact
®
Strip
Micro CL (DPD-3) for Combined Chlorine or the eXact
®
Strip
Micro CL (DPD-4) for Total Chlorine meet your reportable
testing requirements because the eXact
®
Strip Micro CL
delivers the same chemicals in identical proportions.
About the built-in sAmple cell
The built-in sample cell is made of transparent plastic; the sturdy cell design
will last for over 20,000 readings. Scratches on the cell will not compromise
the accuracy of your results because of the cell’s fixed position.
cleAning the sAmple cell
Fill the sample cell with water and use the enclosed cleaning brush
to scrub the sample cell thoroughly. Rinse the cell. You can use dish
soap or distilled white vinegar for cleaning the cell if needed. NEVER
use solvents such as acetone.
component
(Free chlorine)
AWWA
4500-cl g
eXAct
®
DpD-1
Anhydrous DPD sulfate
1.5%
1.5%
Anhydrous Na
2
HPO
4
33.4%
33.4%
Anhydrous KH
2
PO
4
Na
2
64.0%
64.0%
EDTA
1.1%
1.1%
®
