Hanna Instruments HI 83216-01 - Manual (Page 28)

28 Total Chlorine
• Press the Zero key. The meter will show “-0.0-” when the meter is zeroed and ready for measurement.
• Remove the cuvette.
• Add 1 packet of HI 93711-0 DPD reagent. Replace the cap
and shake gently for 20 seconds.
• Reinsert the cuvette into the instrument.
• Press Timer and the display will show the countdown prior to the measurement or, alternatively, wait
for 2 minutes and 30 seconds and press Read. When the timer ends the meter will perform the
reading. The instrument displays the results in mg/L of total chlorine.
INTERFERENCES
Interference may be caused by: Bromine, Chlorine Dioxide, Iodine, Ozone (all these interferences give positive
errors).
Alkalinity above 250 mg/L CaCO
3
will not reliably develop the full amount of color or it may rapidly fade.
To resolve this, neutralize the sample with diluted HCl.
In case of water with hardness greater than 500 mg/L CaCO
3
, shake the sample for approximately
2 minutes after adding the powder reagent.