64
65
Phosphate LR
• Reinsert the cuvette into the instrument.
• Press TIMER and the display will show the countdown prior to the
measurement or, alternatively, wait for 3 minutes and press READ.
When the timer ends the meter will perform the reading. The
instrument displays concentration in mg/L of phosphate (PO
4
3-
).
• Press the
or
to access the second level of functions.
• Press the
Chem Frm
functional key to convert the result in mg/L of phosphorus (P) and phosphorus
pentoxide (P
2
O
5
).
• Press the
or
to go back to the measurement screen.
INTERFERENCES
Interference may be caused by:
Iron above 50 mg/L
Silica above 50 mg/L
Silicate above 10 mg/L
Copper above 10 mg/L
Hydrogen sulfide, arsenate, turbid sample and highly buffered samples also interfere.
Phosphate LR
PHOSPHATE LOW RANGE
SPECIFICATIONS
Range
0.00 to 2.50 mg/L
Resolution
0.01 mg/L
Accuracy
±0.04 mg/L ±4% of reading
Typical EMC Dev.
±0.01 mg/L
Light Source
Tungsten lamp with narrow band interference filter @ 610 nm
Method
Adaptation of the Ascorbic Acid method. The reaction between phosphate and the
reagent causes a blue tint in the sample.
REQUIRED REAGENTS
Code
Description
Quantity
HI 93713-0
Powder reagent
1 packet
REAGENT SETS
HI 93713-01
Reagents for 100 tests
HI 93713-03
Reagents for 300 tests
For other accessories see page 73.
MEASUREMENT PROCEDURE
• Select the
Phosphate LR
method using the procedure
described in the
Method Selection
section (see page 12).
• Rinse, cap and shake the cuvette several times with unreacted
sample. Fill the cuvette with 10 mL of sample up to the
mark and replace the cap.
• Place the cuvette into the holder and close the lid.
• Press ZERO key. The display will show “-0.0-” when the meter is
zeroed and ready for measurement.
• Remove the cuvette and add the content of one packet of
HI 93713-0 reagent. Replace the cap and shake gently
(for about 2 minutes) until the powder is completely
dissolved.
10 mL
