Hanna-instruments HI 83200-01 Manual de usuario descargar pdf (Pagina 55)

108 109

• 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 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 potas-

sium (K).

• Press the  or  to access the second level of functions.

• Press the Chem Frm functional key to convert the result in mg/L of potassium oxide (K

• Press the  or  to go back to the measurement screen.

• For ULTRA HIGH RANGE samples: follow the procedure described at page 110.

Potassium HR

POTASSIUM HIGH RANGE

SPECIFICATIONS

Range 20 to 200 mg/L

Resolution 5 mg/L

Accuracy ±30 mg/L ±7% of reading

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 NUTRIENT SOLUTIONS (HR) procedure at page 19.

• 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

x 6

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