9
About
Compliance Veri
fi
cation
This DPD test system is accepted by most health departments globally because this test is USEPA
(DIN Standard 38 408 G4, ISO 7393/2) accepted for testing requirements for Free and Total Chlorine.
The eXact
®
Micro 20 meter uses a wavelength of 525 nm; and the compliance requirement is that
the colorimeter wavelength is between 490 nm to 530 nm. 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 speci
fi
ed by AWWA (American Water Works Association) method 4500–Cl G. It should be
understood that the USEPA does not “approve” commercial DPD delivery systems such as reagent
powder pillows, tablets, dispensers, or eXact
®
Strip DPD delivery devices. The eXact
®
Strip Micro
CL (DPD–1) for Free Chlorine, and the eXact
®
Strip Micro CL (DPD–3), the eXact
®
Strip Micro CL
(DPD–4) for Total Chlorine, and the eXact
®
Strip Micro Cd (DPD–1) for Chlorine Dioxide meet your
reportable testing requirements because the eXact
®
Strip Micro strips deliver the required chemicals/
components in correct proportions (see table below).
Likewise, AWWA proportions are followed as required for Total Chlorine measurements using
Potassium Iodide. The eXact
®
Strip Micro Chromium is compliant because it uses the correct
wavelength and delivers the same chemicals in the same proportions as AWWA method 3500–Cr B.
This is also true for Phosphate (Ascorbic Acid method, AWWA 4500–P E.) and Sul
fi
de (Methylene
Blue method, AWWA 4500–S
–2
D). Our Ammonia tests are based on the Nitroprusside/phenate
method found in Standard Methods. Interferences are controlled by EDTA and sodium potassium
tartrate. Standard Methods requires an instrument reading in the range of 630 to 660nm. The Micro 20
reads the reacted sample at 638nm.
Component
(Free Chlorine)
AWWA
4500–CI 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%
For a complete list of eXact
®
Strip Micro reagent strips we offer, please see
page 31.
The eXact
®
Micro 20 with Bluetooth
®
is designed to work with our line of eXact
®
Micro Strips. This type
of reagent delivery method is designed to give the most precise accuracy reading for testing various
water quality parameters.
eXact
®
Strip Micro has been designed to offer the user a more “Green” and cost–effective alternative
to testing. Instead of using a 10 mL water sample, eXact
®
Strip Micro uses a 4mL water sample,
which uses up to 60% less chemical per test. The accuracy of the meter is maintained by designing
the photo cell with a 20 mm path–length.
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ct
Strip
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