Watts HF scientific 28030, Owner'S Manual

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CLX-XT (28652) Page 7
REV 5 (5/2020)
3.2 The Cooling Chamber
The CLX-XT has a unique feature that allows for extended reagent life. Under
temperature conditions above 25 ˚ C the indicator reagent would quickly oxidize resulting
in low readings.
To control this condition the CLX-XT has a built-in cooling chamber for the indicator
reagent. The temperature of this chamber is kept below 25 ˚ C in ambient temperatures of
up to 55 ˚ C. This cooling chamber will cycle similar to a normal refrigerator to keep the
indicator reagent at the desired temperature. This temperature is factory set and should not
be adjusted.
To allow for this feature to operate correctly, this cooling chamber must be constantly
powered.
On the right side of the enclosure is a fan. This is required for proper operation of the
cooling chamber and must never be blocked.
3.3 The Reagents
The indicator reagent reacts with any oxidant, generally chlorine, to create a pink color
which the instrument measures and compares with a sample of water without reagents.
The buffer reagent is required to control the sample pH to bring the sample to neutral.
The reagents are provided already hydrated and require little operator preparation.
The indicator reagents are packaged a plastic box. Each 125 mL indicator will require the
addition and mixing of the DPD powder contained in the small brown bottle. This
activates the indicator reagent. The indicator reagents should be changed out on a 90 day
basis even if they are not fully used.
The 500 ml buffer does not require any preparation and is good for one year.
After one year all the reagents will have been consumed and a replacement reagent set will
be required. This can be ordered through agent Catalog No.09991. This set will include a
new plastic box with four sets of Indicator reagents plus one 500 mL bottle of Buffer.