Yokogawa SPS24 Manual do Utilizador descarregar pdf (Página 22)

<3. Sensor Management>

3-5

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

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.

Table 3.4 Buffer selection for 3-point calibration

Buffer for 3-point Calibration Buffer Sequence

NIST/DIN19266 pH1.7→pH6.9→pH9.2

pH4.0→pH6.9→pH9.2

pH9.2→pH6.9→pH1.7

pH9.2→pH6.9→pH4.0

DIN19267 pH4.7→pH6.8→pH9.2

pH9.2→pH6.8→pH4.7

US pH4.0→pH7.0→pH10.0

pH10.0→pH7.0→pH4.0

User setting BufferTable1→BufferTable2→BufferTable3

BufferTable3→BufferTable2→BufferTable1

* In 2-point calibration, set the sequence for each buffer.

n Temperature Calibration (Temperature Setting)

For the most accurate measurements, it is important to have a precise temperature

measurement. Measure the temperature with a high-precision thermometer and adjust the

sensor reading accordingly. For best accuracy, this should be done as near to the normal

operating temperature as possible.

n ORP Calibration (rH Calibration)

No automatic calibration feature is available in an ORP or rH calibration.

Calibration is performed stepwise. Follow the prompts displayed on the screen.

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

reading has stabilized.

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