CLX (4/18) Page 30
REV 6.0
10.3 Replacing or Installing the Reagents
Reagent kits are available from HF scientific for Free Chlorine and for Total Chlorine
Refer to section 11.0 Replacement Parts and Accessories for the appropriate Catalog
numbers. There are two reagents required, and supplied in each kit; the buffer and the
indicator.
The buffer and indicator reagents are provided as dry reagents and require the addition of
deionized water. You will need to have at least 1 liter of deionized water on hand prior to
preparing the solutions. Allow about ½ hour time to prepare the reagents.
Use caution while preparing. The indicator reagent is corrosive and can stain
clothing. The use of protective gloves, clothing and eye protection is recommended.
When commissioning the CLX it is recommended to follow the procedure in section
10.4. This procedure should only need to be done once when first put into service.
Buffer Reagent Preparation
Add about 400 ml of deionized water into the buffer bottle. Cap tightly and shake
vigorously until the powder is fully dissolved. When fully dissolved add enough deionized
water to bring the volume in the bottle up to the fill line.
Indicator Reagent Preparation
Add about 400 ml of deionized water into the indicator bottle. Cap tightly and shake
vigorously until the powder is dissolved. Remove the cap and add the contents of the DPD
powder bottle (small brown bottle). Cap and shake to fully dissolve the powder. When
fully dissolved add enough deionized water to bring the volume in the bottle up to the fill
line.
Once mixed the reagents have an expected life of 30 days. Write the mixing date on
the reagent bottle labels in the area provided. Dispose of expired reagents correctly.
To replace the reagents, press the SERVICE button; this will empty the cuvette and stop
any flow of water. Remove the cap on both bottles replace with the cap supplied with the
CLX. Be sure to replace the reagents in the correct location as labeled on the inside of the
CLX. The buffer is installed on the left and the indicator is installed on the right side. The
suction tube for both reagents will reach the bottom of the bottles.
To complete the replacement procedure, press the PRIME button and then the button.
This will draw enough of each reagent to completely prime the tubes and replace any old
solution. The system will automatically return to normal operation after it has primed.
Use caution when changing the reagents as they are corrosive. These reagents will
stain clothing and anything they contact. After changing the reagents, operators
should wash their hands.
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