Hanna-instruments HI 21 Series Manuale Utente Scaricare il pdf (Pagina 29)

5756

ELECTRODE CONDITIONING AND MAINTENANCE

* Only available with refillable electrodes. For industrial applications, gel-filled electrodes are preferable

due to lesser maintenance requirements.

PREPARATION

Remove the protective cap.

DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE

PRESENT.

This is normal with electrodes and they will disappear when

rinsed with water.

During transport tiny bubbles of air may have formed inside

the glass bulb. The electrode cannot function properly under

these conditions. These bubbles can be removed by "shaking

down" the electrode as you would do with a glass thermom-

eter.

pH VALUES AT VARIOUS TEMPERATURES

Temperature has a significant effect on pH. The calibration

buffer solutions are effected by temperature changes to a lesser

degree than normal solutions.

For manual temperature calibration please refer to the fol-

lowing chart:

TEMP pH VALUES

°C °F 4.01 7.01 10.01

0 32 4.01 7.13 10.32

5 41 4.00 7.10 10.24

10 50 4.00 7.07 10.18

15 59 4.00 7.04 10.12

20 68 4.00 7.03 10.06

25 77 4.01 7.01 10.01

30 86 4.02 7.00 9.96

35 95 4.03 6.99 9.92

40 104 4.04 6.98 9.88

45 113 4.05 6.98 9.85

50 122 4.06 6.98 9.82

55 131 4.07 6.98 9.79

60 140 4.09 6.98 9.77

65 149 4.11 6.99 9.76

70 158 4.12 6.99 9.75

For instance, if the buffer temperature is 25°C, the display

should show pH 4.01, 7.01 or 10.01 at pH 4, 7 or 10

buffers, respectively.

At 20°C, the display should show pH 4.00, 7.03 or 10.06.

The meter reading at 50°C will then be 4.06, 6.98 or 9.82.

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Hanna-instruments HI 21 Series Manuale Utente Pagina 29

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