Hach POCKET COLORIMETER II Instruction Manual

1—33
Chlorine, Free and Total, LR, continued
A user calibration or a user-prepared chlorine standard may be required by a
regulatory official or agency. Two options are available on the
Pocket Colorimeter II to meet this requirement.
A chlorine standard may be prepared and used to validate the calibration curve
using the Standard Calibration Adjust feature (see page 2—13 for more
information). The concentration of the prepared standard must be determined
with an alternate instrument such as a spectrophotometer, colorimeter, or by
using an alternate method such as amperometric titration. The concentration of
the chlorine standard for the LR procedure must be between 0.50 and 1.50
mg/L chlorine.
In addition, a user-generated calibration curve can be programmed into the
Pocket Colorimeter™ II. See User-Entered Calibration on page 2—15 for
more information.
5957088.book Page 33 Friday, March 22, 2013 3:54 PM

Hach POCKET COLORIMETER II Specifications

General

Measurement Method	Colorimetric
Display	LCD
Operating Temperature	0 to 50 °C
Storage Temperature	-40 to 60 °C
Waterproof Rating	IP67
Weight	0.23 kg
Light Source	LED
Range	Varies by parameter
Wavelength	Varies by parameter
Battery Life	Approximately 2000 tests