User Manual

36 37
Total Chlorine
Press the 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 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.
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 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 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 93701A-T DPD1 indicator 3 drops
HI 93701B-T DPD1 buffer 3 drops
HI 93701C 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 128.
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