Hach-Lange CL17 USER MANUAL - Manual (Page 29)

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Section 4 System Startup
CAUTION
Chemical exposure hazard. To familiarize yourself with handling precautions,
dangers and emergency procedures, always review the Material Safety Data Sheets
prior to handling containers, reservoirs, and delivery systems that contain
chemical reagents and standards. Protective eye wear is always recommended
when contact with chemicals is possible.
Preliminary tasks necessary for placing the instrument in operation are defined below in
their recommended sequence. Once these preliminary steps are performed, the
instrument will be operational.
4.1 Install the reagents
The analyzer requires two reagents, a buffer solution and an indicator ( Table 4 ). Space is
provided in the instrument enclosure for a 500-mL bottle of each of the reagents. Two
reagents used in the chlorine analysis are installed in the analyzer hydraulic section and
replenished at monthly intervals. One is the buffer solution, Free Chlorine Buffer, Cat. No.
2314111, used to determine free available chlorine, or Total Chlorine Buffer, Cat. No.
2263511, used for total chlorine analysis. The buffer solutions are completely formulated
at the factory and are ready to install. Remove the cap and seal from the buffer solution
bottle and install the cap and tubing labeled BUFFER to the buffer solution bottle.
Note: It is normal for the reagent tubing to become discolored over time.
The second reagent, the indicator solution, must be prepared.
The indicator solution and indicator powder must be mixed just before use to ensure the
best instrument performance. Using the powder funnel provided in the maintenance kit,
add the contents of one bottle of DPD High Range Powder, Cat. No. 2297255, to a bottle
of Total Chlorine Indicator Solution, Cat. No. 2263411, or a bottle of Free Chlorine
Indicator Solution, Cat. No. 2314011. Stir or shake until the powder is dissolved
completely. Remove the cap from the reagent bottle and install the cap and tubing
labeled INDICATOR to the reagent bottle. Tubing should be inserted to the bottoms of the
bottles to prevent air from being drawn in when the level in the bottle drops.
Remove each reagent bottle cap and replace it with the special two-part bottle cap that is
connected to the delivery tube inside the instrument.
Table 4 Buffer and indicator solutions
Test Type Required Reagent Item No. Reagent Set Item No.
Free Chlorine
Free Chlorine Buffer Solution 2314111
2556900 Free Chlorine Indicator Solution 2314011
DPD Indicator Powder 2297255
Total Chlorine
Total Chlorine Buffer Solution 2263511
2557000 Total Chlorine Indicator Solution 2263411
DPD Indicator Powder 2297255