User Manual

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FREE CHLORINEFREE CHLORINE
FREE CHLORINEFREE CHLORINE
FREE CHLORINE
SPECIFICATIONS
Range 0.00 to 2.50 mg/L
Resolution 0.01 mg/L
Accuracy ±0.03 mg/L ±3% of reading at 25 °C
Typical EMC ±0.01 mg/L
Deviation
Light Source Tungsten lamp with narrow band interference filter @ 525 nm
Method Adaptation of the
EPA DPD method 330.5.
The reaction between free chlorine and the
DPD reagent causes a pink tint in the sample.
REQUIRED REAGENTS
POWDER:
Code Description Quantity
HI 93701-0 DPD 1 packet
LIQUID:
Code Description Quantity
HI 93701A-F DPD1 Indicator 3 drops
HI 93701B-F DPD1 Buffer 3 drops
REAGENT SETS
HI 93701-F Reagents for 300 tests (liquid)
HI 93701-01 Reagents for 100 tests (powder)
HI 93701-03 Reagents for 300 tests (powder)
For other accessories see page 128.
MEASUREMENT PROCEDURE
Select the
Free Chlorine
method using the procedure described
in the
Method Selection
section (see page 12).
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.
Free Chlorine
FREE CHLORINE
Press Timer or wait for 5 minutes. Then invert again
the cuvette 10 times to mix (about 15 seconds).
Reinsert the cuvette into the instrument.
Press Read to start the reading. The instrument displays the results in mg/L of Calcium.
INTERFERENCES:
Interferences may be caused by:
Acidity (as CaCO
3
) above 1000 mg/L
Alkalinity (as CaCO
3
) above 1000 mg/L
Magnesium (Mg
2+
) above 400 mg/L
Replace the cap and invert several times to mix.
Place the cuvette into the holder and close the lid.
Press the Zero key. The display will show “-0.0-” when
the meter is zeroed and ready for measurement.
Remove the cuvette.
Using the 1 mL syringe, add exactly 1 mL of the
HI 93752B-0 Calcium Oxalate Reagent. Replace the
cap and invert the cuvette 10 times to mix (about
15 seconds).
Calcium
10 mL