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Phosphate HR
• Press ZERO and “SIP” will blink on the display.
• Wait for a few seconds and the display will
show "-0.0-". Now the meter is zeroed and
ready for measurement.
• Remove the cuvet.
• Add 10 drops of HI 93717A
Molybdate reagent.
• Add to the cuvet 0.5 mL of the
solution prepared in the HI
93717B bottle. Replace the cap
and mix the solution.
• Reinsert the cuvet 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
DIRECT. In both cases "SIP" will blink during measurement.
• The instrument directly displays concentration in mg/L of phos-
phate (PO
4
3–
) on the Liquid Crystal Display.
INTERFERENCES
Interference may be caused by:
Sulfide
Chloride above 150000 mg/L
Calcium above 10000 mg/L as CaCO
3
Magnesium above 40000 mg/L as CaCO
3
Ferrous iron above 100 mg/L
x 10
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