Yokogawa SPS24 Manual do Utilizador descarregar pdf (Página 20)

<3. Sensor Management>

3-3

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

3.3 [Start calibration]

Clicking on [Start calibration] in “Current measurement readings” will display the selection screen

that shows sensors to be calibrated.

Sensors of the same model and type can be calibrated simultaneously.

Whenasensorisselected,theupperpartofthesensorbuttonturnsblueforidentication.

Before pH measurement, calibrate the pH sensor with the standard solution.

Before ORP measurement, check the electrode as regular maintenance.

Calibration object are pH, ORP, rH, and temperature. pH calibration has manual and automatic

modes, each with three calibration types.

n pH Calibration (Manual)

The unit is adjusted to match the value of the buffer standards or a process solution with a known

pH value (buffer solution).

TheuserdeterminesthepHvalue,temperatureinuence,andstability.

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.

Atcalibration,weadviseleavingthesensorsforthreetoveminutesinthebuffersolutionbefore

proceedingtothenextstepevenwhenthereadinghasstabilized.Thiswillgivereliableand

accurate calibration results.

l Zero/slope

This calibration type is one-point or two-point calibration.

One-point calibration performs the zero adjustment only. Two-point calibration performs the zero

and slope adjustments.

l Zero/slope/ITP(3point)

This calibration type is ITP-type three-point calibration.

IfITPdoesnothavepH7,three-pointcalibrationisperformedtoobtainthezero(asymmetry),

slope (sensitivity), and ITP (isothermal point) for 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2ndbuffersolutionshouldbepH7±2.

• 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.

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