Hanna-instruments HI 4521 Manual de usuario descargar pdf (Pagina 29)

Clear Calibration

Accessing this option, the existent pH calibration can be cleared. If the calibration is cleared, another calibration

has to be performed.

To clear Calibration:

• Use or to select the Calibration option.

• Press and use or to highlight the

Clear Calibration

option.

• Press to clear calibration. A pop-up menu will be

displayed asking for confirmation.

• Press to confirm or press to escape without

saving and return to the Calibration options.

Sample ID

This option allows the user to give to the measured samples an identification number/name. Two Sample ID

options are available:

ID Increment Mode

and

Edit Sample ID

ID Increment Mode

Two increment modes for the sample ID can be selected:

None – the sample ID will be fixed and it can be set alphanumerically.

Automatic – the sample ID will be increased with 1 for each new log lot.

To set the ID Increment Mode:

• Use or to select the

Sample ID

option.

• Press and use or to highlight the

ID Increment Mode

option.

• Press and use or to highlight the

desired option.

• Press to confirm your selection or press

cancel operation.

DIRECT/USP MEASUREMENT

In this measure mode the user can check for ultra pure water using the United States Pharmacopeia standard

(USP <645>).

This USP standard consists of three stages (one in-line and two off-line tests) as following:

Stage 1 - this is an in-line test.

To perform this test:

• Measure the temperature of the water and the uncompensated conductivity readings. The measurement

may be performed in a suitable container or as in-line measurement.

• The temperature will be round down to the nearest 5 °C and look up the corresponding conductivity value

in the below table.

• If the measured conductivity is lower than the conductivity in the table, then the water meets the USP

requirements.

• Otherwise, proceed to Stage 2 testing.

Stage 2 - this is an off-line test.

To perform this test:

• Store the water sample in an enclosed clean container that has been rinsed previously with water of the

same quality.

• Adjust the sample’s temperature to 25 °C and agitate the sample to ensure that it has equilibrated with

ambient CO

• If the measured conductivity is less than 2.1 µS/cm, then the sample has met the USP requirements.

• Otherwise, proceed to Stage 3 testing.

erutarepmeT

)C°(

ytivitcudnoC

)mc/Sµ(

erutarepmeT

)C°(

ytivitcudnoC

)mc/Sµ(

0 6.0 55 1.2

5 8.0 06 2.2

01 9.0 56 4.2

51 0.1 07 5.2

02 1.1 57 7.2

52 3.1 08 7.2

03 4.1 58 7.2

53 5.1 09 7.2

04 7.1 59 9.2

54 8.1 001 1.3

05 9.1

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 57 58

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Hanna-instruments HI 4521 Manual de usuario Pagina 29

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