Hanna Instruments HI 83200C User Manual

Page 55

108

109

1’

• 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 ▲ or ▼ to access the second level functions.
• Press the

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

O).

• Press ▲ or ▼ to return 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 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 93750

A-0

Potassium Reagent

6 drops

HI 93750

B-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