Watts HF scientific 28030, Owner'S Manual

Page: 39 / 45

CLX-XT (28652) Page 33
REV 5 (5/2020)
10.2 Replacing or Installing the Reagents
Reagent kits are available from HF scientific for Total Chlorine Refer to section 11.0
Replacement Parts and Accessories for the appropriate Catalog number. There are two
reagents required, for the instrument to operate; the buffer and the indicator.
The reagents are provided “wet” and the buffer is ready to use and will last up to one year.
The smaller indicator reagent does require the addition of the DPD power to activate it.
Once activated it starts to oxidize. This process is slowed by keeping it in the cooling
chamber.
When commissioning the CLX-XT it is recommended to follow the procedure in
section 10.3. This procedure only needs to be done once when the instrument first
commissioned.
Indicator Reagent Preparation
Remove the cap of the small liquid indicator reagent and add the contents of the DPD
powder bottle (small brown bottle). Cap and shake to fully dissolve the powder.
Once mixed the indicator has an expected life of up to 90 days if kept in the powered
cooling chamber. 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-XT. The buffer is installed on the left and the indicator is installed in the cooling
chamber. 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 may
stain clothing. After changing the reagents, operators should wash their hands.