28
29
Total Chlorine
• Press ZERO key. The meter will show “-0.0-” when the meter is zeroed and ready for measurement.
• Remove the cuvette.
Powder reagents procedure
• Add 1 packet of HI 93711-0 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 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.
Liquid reagents procedure
• To an empty cuvette add 3 drops of HI 93701A-T
DPD1 indicator, 3 drops of HI 93701B-T DPD1 buffer and
1 drop of HI 93701C DPD3 solution. Swirl gently to mix
and immediately add 10 mL of unreacted sample.
Replace the cap and shake gently again.
• Reinsert the cuvette into the instrument.
x 3
x 3
x 1
Total Chlorine
TOTAL CHLORINE
SPECIFICATIONS
Range
0.00 to 3.50 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 the chlorine and the
DPD reagent causes a pink tint in the sample.
REQUIRED REAGENTS
POWDER:
Code
Description
Quantity
HI 93711-0
DPD
1 packet
LIQUID:
Code
Description
Quantity
HI 93701
A
-T
DPD1 indicator
3 drops
HI 93701
B
-T
DPD1 buffer
3 drops
HI 93701
C
DPD3 solution
1 drop
REAGENT SETS
HI 93701-T
Reagents for 300 total chlorine tests (liquid)
HI 93711-01
Reagents for 100 total chlorine tests (powder)
HI 93711-03
Reagents for 300 total chlorine tests (powder)
For other accessories see page 73.
MEASUREMENT PROCEDURE
• Select the
Total 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.
10 mL
