Hanna Instruments HI 83216 - Manual (Page 15)

28 29 Cyanuric Acid
CYANURIC ACID
SPECIFICATIONS
Range 0 to 200 mg/L
Resolution 1 mg/L from 0 to 100 mg/L;
10 mg/L above 100 mg/L
Accuracy ±1 mg/L ±15% of reading at 25 °C
Typical EMC ±1 mg/L
Deviation
Light Source
Tungsten lamp with narrow band interference filter @ 525 nm
Method Adaptation of the turbidimetric method. The reaction between cyanuric acid and the
reagent causes a white suspension in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93722-0 Powder reagent 1 packet
REAGENT SETS
HI 93722-01 Reagents for 100 tests
HI 93722-03 Reagents for 300 tests
For other accessories see page 34.
MEASUREMENT PROCEDURE
• Select the Cyanuric Acid method using the procedure described in the Method Selection section (see page 15).
• Fill the cuvette with 10 mL of unreacted sample (up to the mark)
and replace the cap.
• Place the cuvette into the holder and close the lid.
• Press the Zero key. The meter will show “-0.0-” when the meter is zeroed and ready for
measurement.
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.
10 mL