Yokogawa SPS24 Manual de usuario descargar pdf (Pagina 21)

<3. Sensor Management>

3-4

IM 12A01S02-01E 1st Edition : May 10, 2013-00

l Zero/slope1,2(3point)

This calibration type is the line-segment type three-point calibration.

If the relation between electromotive force and pH is not in proportion for a wide range, divide the

relevant range into two sections and obtain the zero (asymmetry) and slope (sensitivity) in each

section to perform calibration.

Limitations

• ThreedifferentbuffersolutionswhosedifferenceinpHvaluebetweenbuffersolutionsis1

pH or more should be used.

(1st buffer < 2nd buffer < 3rd buffer or 1st buffer > 2nd buffer > 3rd buffer)

• Thetemperaturedifferencebetweenthe1stand2ndbuffersolutionsshouldbe20ºCor

less.

• Thetemperaturedifferencebetweenthe2ndand3rdbuffersolutionsshouldbe20ºCor

less.

n pH Calibration (Auto)

Calibration can easily be performed by following the calibration menus.

Pre-selectthebuffersolutiontobeusedfromamongNIST/DIN19266,DIN19267,US,and

Programmablein[Setup]–[pH/ORP]–[pH/ORPcommonsettings]–[pHcalibrationsettings]–

“Select buffer set”.

If you select Programmable, calibration is performed based on the conditions registered in buffer

tables 1 to 3. Use of the proper buffer table allows the system to perform reliable calibration.

In the same way as manual pH calibration, select the calibration type from among [Zero/slope],

[Zero/slope/ITP(3point)], and [Zero/slope1,2(3point)].

Calibration is performed stepwise; follow the prompts displayed on the screen.

Astabilitycheckisconductedateachmeasurementpoint.Proceedtothenextsteponlyafterthe

reading has stabilized.

l Zero/Slope

Select the solution that works with the “buffer solution” selected in calibration settings and

perform calibration by following the prompts on the screen.

l Zero/Slope/ITP (3 points)

Calibration is performed in the sequence of the sequence selection menu (Table 3.4) of the

solution that works with the “buffer solution” selected in calibration settings. Perform calibration

by following the prompts on the screen.

Limitations

• ThreedifferentbuffersolutionswhosedifferenceinpHvaluebetweenbuffersolutionsis1

pH or more should be used.

(1st buffer < 2nd buffer < 3rd buffer or 1st buffer > 2nd buffer > 3rd buffer)

• The2ndbuffersolutionintheuserdenedbuffertablesshouldbepH7±2(at25ºC).

• Thetemperaturedifferencebetweenthe1stand3rdbuffersolutionsshouldbe20ºCor

more.

• Thetemperaturedifferencebetweenthe2ndand3rdbuffersolutionsshouldbe20ºCor

more.

l Zero/Slope 1, 2 (3 points)

Calibration is performed in the sequence of the sequence selection menu (Table 3.4) of the

solution that works with the “buffer solution” selected in calibration settings. Perform calibration

by following the prompts on the screen.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 34 35

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