Spec ™ Secondary Standards For Dpd Chlorine - Hach POCKET COLORIMETER II Instruction Manual

Specê Secondary Standards for DPD Chlorine
Note:
Due to improvements in the optical system of the Pocket Colorimeter™ II, the tolerance
ranges and values on the Certificate of Analysis of previously purchased Spec √ standards
may no longer be valid. Obtain a new set of standards, or use the Pocket Colorimeter II to
assign new values to existing standards.
The DPD Chlorine Spec√ Secondary Standards are available to quickly check the
repeatability of the Pocket Colorimeter™ II instrument (see OPTIONAL REAGENTS
on page 1—47).
After initial measurements for the Spec√ standards are collected in the low range
(LR) channel, the standards can be re-checked as often as desired to ensure the
instrument is working consistently.
The standards do not ensure reagent quality nor do they ensure the accuracy of the
test results. Analysis of real standard solutions using the kit reagents is required to
verify the accuracy of the entire Pocket Colorimeter system. The Spec√ Standards
should NEVER be used to calibrate the instrument. The certificate of analysis lists
the expected value and tolerance for each Spec√ Standard.
Note:
Before proceeding, make sure the instrument is in the low
Switching Ranges on page 2—4.
1—43
range channel. See
(LR)