User Manual

120 121
10 mL
Add the content of one packet of HI 93751-0
Indicator reagent.
Replace the cap and invert gently to mix for
1 minute (about 30 inversions).
Reinsert the cuvette into the instrument.
Press Timer and the display will show the countdown prior to the measurement or, alternatively, wait
for 5 minutes and press Read. When the timer ends the meter will perform the reading.
The instrument displays concentration in mg/L of Sulfate (SO
4
2
¯).
INTERFERENCES
Interferences may be caused by:
Calcium (as CaCO
3
) above 20000 mg/L
Chloride (as Cl
-
) above 40000 mg/L
Magnesium (as MgCO
3
) above 10000 mg/L
Silica (as SiO
2
) above 500 mg/L
Color or suspended matter in large amounts will interfere: suspended matter should be removed by previous
filtration.
Organic matter in large amounts may impede the precipitation of barium sulfate.
Sulfate
12
3
6
9
1’
SPECIFICATIONS
Range 0 to 100 mg/L
Resolution 5 mg/L
Accuracy ±5 mg/L ±3% of reading at 25 °C
Light Source Tungsten lamp with narrow band interference filter @ 466 nm
Method Sulfate is precipitated with barium chloride crystals. Light absorbance of the suspension
is measured.
REQUIRED REAGENTS
Code Description Quantity
HI 93751-0 Indicator reagent 1 packet
REAGENT SETS
HI 93751-01 Reagents for 100 tests
HI 93751-03 Reagents for 300 tests
For other accessories see page 128.
MEASUREMENT PROCEDURE
Note: for sample preparation follow the COLORED OR TURBID SAMPLES procedure on page 17.
Select the
Sulfate
method using the procedure described
in the
Method Selection
section (see page 12).
Fill a 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.
Press the Zero key. The display will show “-0.0-” when the meter is zeroed and ready for
measurement.
Remove the cuvette.
Sulfate
SULFATE