User Guide

16
ON
OFF
Fe
Mn
Manganese
HI 93748A-0 Ascorbic acid 2 packets
HI 93748B-0 Alkaline-cyanide solution 0.40 mL
HI 93748C-0 0.1% PAN indicator 2 mL
HI 93703-51 Dispersing Agent 4-6 drops (only
when necessary, see note)
REAGENT SETS
HI 93746-01 Reagents for 50 iron LR tests
HI 93746-03 Reagents for 150 iron LR tests
HI 93748-01 Reagents for 50 manganese LR tests
HI 93748-03 Reagents for 150 manganese LR tests
For other accessories see page 48.
MEASUREMENT PROCEDURE
• Turn the meter on by pressing ON/OFF.
• When the LCD displays "- - -", it is ready.
IRON MEASUREMENTS
• Select the iron parameter by pressing the Fe/
Mn key until "F" appears on the display.
• Follow the procedure on page 44.
MANGANESE MEASUREMENTS
• Select the manganese param-
eter by pressing the Fe/Mn
key until "n" appears on the
display.
• Fill one cuvet up to the mark with 10 mL of
deionized water.
• Fill a second cuvet up to the mark with 10 mL
of sample.
HI 93742
Iron LR/Manganese LR
Fe
Mn
10 mL
10 mL
37
Liquid reagent procedure
• Add 3 drops of HI 93701A-T DPD1 indicator, 3 drops of
HI 93701B-T DPD1 buffer and 1 drop of HI 93701-C to another
cuvet. Shake gently before adding 10 mL of unreacted sample.
Replace the cap and shake gently again.
• Reinsert the cuvet into the instrument.
• Wait for approximately 30 seconds and then press READ. The
display will show "SIP" during measurement.
• The instrument directly displays concentration in mg/L of free or
total chlorine on the Liquid Crystal Display.
Note: Free and total chlorine have to be measured separately with
fresh unreacted samples following the above procedure if both
values are requested.
INTERFERENCES
Interference may be caused by:
Bromine, Iodine, Fluorine, Ozone, Oxidized manganese and Chro-
mium.
In case of water with hardness greater than 500 mg/L CaCO
3
, shake
the sample for approximately 1 minute after adding the reagent.
Alkalinity above 250 mg/L or acidity above 150 mg/L will not
reliably develop the full amount of color or it may rapidly fade. To
resolve this, neutralize the sample with diluted HCl or NaOH.
Total Chlorine
x 3 x 3
x 1