Hanna-instruments HI 4321 Manuale Utente Scaricare il pdf (Pagina 44)

Stage 3 - this is an off-line test.

Test steps:

• Take the water sample from the previous stage and increase its ionic strength for a pH measurement at

25 °C;

• Record the pH and round it to the nearest 0.1 pH;

• Look up the corresponding conductivity value measured in Stage 2 above;

• If the conductivity is lower than the conductivity from the below table, then the sample has met the USP

requirements. Otherwise, the water didn’t meet the USP requirements.

To access the USP menu:

• Select the

Direct/USP

reading mode (see

Conductivity

Setup

);

• Return to measure mode;

• Press (USP) and then select the desired USP stage.

ytivitcudnoC

)mc/Sµ(

ytivitcudnoC

)mc/Sµ(

0.57.41.64.2

1.51.42.65.2

2.56.33.64.2

3.53.34.63.2

4.50.35.62.2

5.58.26.61.2

6.56.27.66.2

7.55.28.61.3

8.54.29.68.3

9.54.20.76.4

0.64.2

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Hanna-instruments HI 4321 Manuale Utente Pagina 44