User Guide

10
The instructions listed below should be carefully followed during testing
to ensure best accuracy.
• Color or suspended matter in large amounts may cause interference,
therefore, these should be removed by treatment with active carbon
and by prior filtration.
• For a correct filling of the cuvet: the liquid
in the cuvet forms a convexity on the top;
the bottom of this convexity must be at
the same level of the 10 mL mark.
• Proper use of the dropper: to get good re-
producible results, tap the dropper on the
table for several times and wipe the outside
of the dropper tip with a cloth. Always keep
the dropper bottle in a vertical position while
dosing the reagent.
• Proper use of the powder reagent packet:
(a) use scissors to open the powder packet;
(b) push the edges of the packet to form a spout;
(c) pour out the content of the packet.
10 mL
TIPS FOR AN ACCURATE MEASUREMENT
• It is important that the sample does not contain any debris. This
would corrupt the readings.
• Do not let the reacted sample stand too long after reagent is
added, or accuracy will be lost.
• In order to avoid reagent leaking and to obtain more
accurate measurements, it is recommended to close
the cuvet first with the supplied HDPE
plastic stopper and then with the black cap.
• Each time the cuvet is used, the cap must be tightened
to the same degree.
(a)
(b)
(c)
SPECIFICATIONS
Range 0 to 150 mg/L
Resolution 5 mg/L
Accuracy ±5 mg/L ±3% of reading
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 56.
MEASUREMENT PROCEDURE
Note: for sample preparation follow the IRRIGATION WATER (LR)
procedure at page 19.
• Select the program number 15 “Sulfate” on the secondary LCD by
pressing PROGRAM M and L.
• Fill a cuvet with 10 mL of unreacted
sample (up to the mark) and replace
the cap.
• Place the cuvet into the holder and
ensure that the notch on the cap is
positioned securely into the groove.
• Press ZERO and "SIP" will appear on
the display.
SULFATE
Sulfate
51
10 mL