Hach DR2400 - Page 202

Chlorine, Total
Chlorine, Total
Page 2 of 8
ChlorineTot_PT_ULow_DPD_Eng_Ody.fm
5. When the timer
beeps, touch
Zero.
The display will show:
0 µg/L
6. Break open one ULR
Chlorine Buffer Solution
Ampule.
7. Using a TenSette
®
Pipet and a clean tip,
transfer 1.0 mL of buffer
from the ampule to a
clean, treated 50-mL
graduated mixing
cylinder.
8. Break open one
ampule of DPD Indicator
Solution for Ultra Low
Range Chlorine.
9. Using a TenSette
®
Pipet and a clean tip,
transfer 1.0 mL of
indicator from the
ampule to the graduated
mixing cylinder. Swirl to
mix.
Proceed to step 10 within
one minute.
10. Avoiding extra
agitation, carefully fill the
cylinder to the 50-mL
mark with sample.
Stopper the cylinder.
Gently invert it twice to
mix. This is the prepared
sample.
11. Touch the timer icon.
Touch
OK.
A three-minute reaction
time will begin.
Measure the reacted
sample 3–4 minutes after
mixing the sample and
reagents. If less than three
minutes elapses, the
reaction with chloramines
may be incomplete. A
reading after four minutes
may result in higher
reagent blank values.
12. Introduce the
contents of the graduated
mixing cylinder into the
Pour-Thru cell.
When the timer beeps,
touch
Read. The result in
µg/L chlorine will appear.
Note: If a dechlorinating agent
(e.g. sulfite or sulfur dioxide) is
present, the sample result
(corrected for the reagent
blank) will read “0” or a slightly
negative value.
Zero