YSI 9300 Photometer - Manual (Page 55)

PHOTOMETER TEST INSTRUCTIONS
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Chlorine and chlorine release compounds are widely used for disinfection or
sterilisation of water distribution systems and pipe work, plant and equipment in
food processing and pharmaceutical factories, and similar applications. The
chlorine levels used in these applications are higher than those normally applied
for the simple disinfection of water. Accurate measurement of the chlorine level
is necessary to ensure it is sufficient for the intended use. The YSI Chlorine HR
test provides a simple means of measuring the total chlorine over the range 0 -
250 mg/l.
Method
The YSI Chlorine HR test is based on an iodine release method. Chlorine reacts
with potassium iodide in acid solution to release iodine which is brown in color.
The reagents for the test are provided in the form of two tablets for maximum
convenience and simplicity of use.
The intensity of the color produced is proportional to the chlorine concentration
and is measured using a YSI Photometer.
Reagents and Equipment
YSI Acidifying GP Tablets
YSI Chlorine HR Tablets
YSI 9300 or 9500 Photometer
Round Test Tubes, 10 ml glass (PT 595)
Photometer Method
AUTOMATIC
WAVELENGTH
SELECTION
0 – 250 mg/l
PHOT.9.AUTO