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FREE CHLORINE
FREE CHLORINE
FREE CHLORINE
FREE 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
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 93701
A
-F
DPD1 Indicator
3 drops
HI 93701
B
-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
10 mL
• Press TIMER or wait for 5 minutes, then invert
again the cuvette 10 times. Reinsert the cuvette
into the instrument.
• Press READ to start the reading. The instrument displays
the results in mg/L of Calcium.
Note:
To ensure accurate results, perform the tests at room temperature, between 18°C and 28°C (65°F
to 83°F).
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 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.
Calcium
