User Manual

96 97
OZONE
SPECIFICATIONS
Range 0.00 to 2.00 mg/L
Resolution 0.01 mg/L
Accuracy ±0.02 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 Colorimetric DPD Method. The reaction between ozone and the DPD reagent causes a
pink tint in the sample.
REQUIRED REAGENTS
Code Description Quantity/test
HI 93757-0 DPD Powder Reagent 1 packet
HI 93703-52-0 Glycine Powder (Optional Reagent) 1 packet
REAGENT SETS
HI 93757-01 Reagents for 100 tests
HI 93757-03 Reagents for 300 tests
HI 93703-52 Glycine Powder, Optional Reagent for 100 tests
For other accessories see page 128.
IMPORTANT NOTE: Chlorine is a strong interferent for ozone determination. If the sample is suspected to
contain chlorine residues (free or total chlorine), please follow the alternative measurement procedure
described below:
Perform the Standard Measurement Procedure and take note of the reading:
value A
.
On a fresh sample perform the Additional Measurement Procedure and take note of the reading:
value B
.
Subtract reading
B
from reading
A
to obtain the ozone concentration in mg/L:
mg/L (O
3
) =
value A
value B
.
STANDARD MEASUREMENT PROCEDURE
Select the
Ozone
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.
Ozone
Dissolved Oxygen
Let the sample stand and the flocculent agent will start to settle.
After approximately 2 minutes, when the upper half of the bottle becomes limpid,
add 10 drops of HI 93732C-0.
Replace the cap and invert the bottle until the settled flocculent dissolves completely.
The sample is ready for measurement when it is yellow and completely limpid.
Fill the cuvette up to the mark with 10 mL of the unreacted
(original) sample, and replace the cap. This is the blank.
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.
Fill another cuvette up to the mark with 10 mL of the reacted
sample and replace the cap.
Reinsert the cuvette into the instrument.
Press Read to start the reading. The instrument will display the results in mg/L of dissolved oxygen.
INTERFERENCES
Interferences may be caused by reducing and oxidizing materials.
10 mL
10 mL