Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manuel d'utilisateur télécharger pdf (Page 57)

<4. COMMISSIONING OF pH/ORP>

4-3

IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00

4.1 Sensor setup

“Sensor type” setup is determined by the sensor to be connected to the instrument. Select one of

the following three sensor types:

pH: Only pH is measured. The glass electrode (input 1) is connected to terminal 15

and the reference electrode (input 2) is connected to terminal 13.

ORP: OnlyRedoxismeasured.Themetalelectrode(input1)isconnectedtoterminal15

and the reference electrode (or glass) (input 2) is connected to terminal 13.

pH+ORP: BothpHandORParemeasuredsimultaneously.Theglasselectrodeisconnected

to terminal 15, the reference electrode to terminal 13, and the metal electrode to

terminal 14. This setup also allows rH to be measured.

Forbestresults,connectaliquidearthtoterminal14.Fordetailsofthewiringconnections,

seeSection2.5.1.Ifthereisnoliquidearth,thesensordiagnosticfunctionisdisabled;setallof

“Impedance1toohigh/low”and“Impedance2toohigh/low”in“Errorconguration”toOffsothat

no related error is caused.

NOTE

The selection of “Sensor type” determines the menu structure throughout the instrument.

WhenpH+ORPisspeciedasthesensortype,theobjectundermeasurementwillbedisplayed

at the top of “Measurement setup.”

IfthesensortypeischangedfrompHtoORP,partoftherelevantsetupisreset,requiring

reconguration.

WhenORPisspecied,andwhenanORPsensordoesn’thaveanytemperatureelement,

setbothof“Temperaturetoohigh/low”in“Errorconguration”toOffsothatnorelatederroris

caused. (Refer to the section 4.4.) Without temperature input, a temperature shown on the Main

displayortheHomedisplayisthemaximumortheminimumtemperatureofthetemperature

element’srangesetontheTemperaturesettings.Settingin“Displaysetup”canmake

temperature value on the display not to be displayed. (Refer to the section 4.7.)

4.2 Measurement setup

This section describes how to set up various parameters relating to measurements.

Measurements are performed based on the measurement parameter setup.

For measurement setup, part of the menu structure of settable items changes depending on the

“Sensor type” selected in “4.1 Sensor setup.”

4.2.1 Measurement

If “pH” or “ORP” is selected in “Sensor type,” a measurement type does not need to be selected

and it is not displayed.

If“pH+ORP”isselectedin“Sensortype,”vemeasurementtypescanbeselectedforthe

“Measurement” item at the top of the Measurement setup screen. Select a suitable measurement

type for the application.

Moreover,associateditemsareaddedtoparametersin“Errorconguration,”“Displaysetup,”

etc.;checkthesettingconditionofeachitem.

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Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manuel d'utilisateur Page 57