115
• Remove the cuvette and add the content of one packet of
HI 93750B-0 reagent. Replace the cap and gently mix for
one minute by slowly turning the cuvette upside down.
• Reinsert the cuvette into the instrument.
• Press
Timer
and the display will show the countdown prior to
the measurement or, alternatively, wait for 2 minutes and press
Read
. When the timer ends the meter will perform the reading.
The instrument displays the results in
mg/L (ppm) of
potassium (K)
.
• Press
or
to access the second level functions.
• Press the
Chem Frm
key to convert the result in mg/L of potassium oxide (K
2
O)
• Press
or
to return to the measurement screen.
• For ULTRA HIGH RANGE samples: follow the procedure described at page 115.
INTERFERENCES
Interferences may be caused by:
Chloride above 12000 ppm
Ammonium above 10 ppm
Magnesium above 8000 ppm as CaCO
3
Calcium above 10000 ppm as CaCO
3
Sodium above 8000 ppm
Potassium HR
POTASSIUM ULTRA HIGH RANGE
For samples containing more than 200 ppm of Potassium: follow the sample preparation procedure
described at page 18 for CONCENTRATED SAMPLES. Then add to the graduated cylinder 20 mL of the
prepared sample (for HR) and fill the cylinder with demineralized water from the Demineralizer Bottle up
to the 100 mL mark.
Follow the MEASUREMENT PROCEDURE at page 114. Read the result in
mg/L of potassium
on the display
and multiply the reading by 5 to obtain the actual concentration of Potassium.