34
Free Chlorine
• Press the
Zero
key. The meter will show “
-0.0-
” when the meter is zeroed and ready for measurement.
• Remove the cuvette.
Powder reagents procedure
• Add the content of one packet of HI 93701 DPD reagent.
Replace the cap and shake gently for 20 seconds (or 2 minutes
for seawater analysis).
• Reinsert the cuvette into the instrument.
• Press
Timer
and the display will show the countdown prior to the measurement or, alternatively, wait
for 1 minute and press
Read
. When the timer ends the meter will perform the reading. The instrument
displays the results in
mg/L of free chlorine
.
Liquid reagents procedure
• To an empty cuvette add 3 drops of HI 93701A-F DPD1
indicator and 3 drops of HI 93701B-F DPD1 buffer. Swirl
gently to mix, and immediately add 10 mL of unreacted
sample. Replace the cap and shake gently again.