User Manual

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Press the 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 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 s or t 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 s or t to return to the measurement screen.
For ULTRA HIGH RANGE samples: follow the procedure described at page 110.
Potassium HR
Potassium HR
POTASSIUM HIGH RANGE
SPECIFICATIONS
Range 20 to 200 mg/L
Resolution 5 mg/L
Accuracy ±30 mg/L ±7% of reading at 25 °C
Typical EMC ±5 mg/L
Deviation
Light Source Tungsten lamp with narrow band interference filter @ 610 nm
Method Adaptation of the Turbidimetric Tetraphenylborate method. The reaction between
Potassium and reagents causes turbidity in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93750A-0 Potassium Reagent 6 drops
HI 93750B-0 Powder Reagent 1 packet
REAGENT SETS
HI 93750-01 Reagents for 100 tests
HI 93750-03 Reagents for 300 tests
For other accessories see page 128.
MEASUREMENT PROCEDURE
Note: for sample preparation follow the CONCENTRATED SAMPLES procedure at page 18.
Select the
Potassium HR
method using the procedure
described in the
Method Selection
section (see page 12).
Fill the cuvette with 10 mL of sample, up to the mark.
Add six drops of HI 93750A-0, replace the cap and swirl
the solution.
Place the cuvette into the holder and close the lid.
10 mL