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pNa

HI 98202

Soft Water Tester

GENERAL INFORMATION

The pNa tester utilizes a sodium ion-selective

electrode to determine the activity of free sodium

in solution (pNa = -log a

In dilute solutions, the activity coefficient is nearly

1 and in such solutions pNa is a good indicator

of the sodium ion concentration. The relationship

between the pNa scale and the g/L Na

scale is

explained in the chart below.

A double junction reference is used to ensure a

highly stable reading. If you suspect that the

calibration has drifted, you can recalibrate the

meter by using a solution of known concentration.

Adjust the reading with the calibration trimmer.

HOW TO USE THE CHART

• Locate the pNa reading on the horizontal axis

of the chart.

• Move vertically upwards to intersect with the

45º line.

• Move horizontally and read the g/L Na value.

E.g. pNa = 1.4

g/L = 0.9

www.hannainst.com

1 2

IST98202 R5 05/05 2

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Seite 1

pNaHI 98202Soft Water TesterGENERAL INFORMATIONThe pNa tester utilizes a sodium ion-selectiveelectrode to determine the activity of free sodiumin sol

Seite 2 - IST98202 R5 05/05

MAINTENANCEIn case of erroneous reading even after anaccurate calibration, the reference junction canbe contaminated or clogged.Pull out 2 mm (1/8&apo

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Hanna-instruments HI 98202 Bedienungsanleitung

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