User Guide

125 Phosphate LR
• Wait for a few seconds and the display will
show “-0.0-”. Now the meter is zeroed
and ready for measurement.
• Remove the cuvet and add the content
of one packet of HI 93713 reagent.
Replace the cap and shake gently (for
about 2 minutes) until the powder is
completely dissolved.
• Reinsert the cuvet 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
DIRECT. In both cases "SIP" will blink during measurement.
• The instrument directly displays concentration in mg/L of phosphate
on the Liquid Crystal Display.
• To convert the reading to mg/L of P
2
O
5
, multiply by a factor of
0.747.
• To convert the reading to mg/L of phosphorus (P) concentration,
multiply by a factor of 0.326.
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.