Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual de usuario descargar pdf (Pagina 58)

<4. COMMISSIONING OF pH/ORP>

4-4

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

4.2.2 Temperature settings

SelectthetemperatureelementusedforcompensationfromamongPt1000,Pt100,3kBalco,

8k55,PTC10k,6k8,and500Ω.Selectthesametypeasthetemperatureelementthatisactually

connected.

Celsius (°C) or Fahrenheit (°F) temperature units are available. If the unit is changed, the

following values are also recalculated automatically to the new unit:

• Manualtemp.

• Reference temp.

• Temp.coefcient

• Temp.rangesinthematrix

4.2.3 Temperature compensation

ORPmeasurementinvolvesnotemperatureinput.Nosettingisrequiredonthetemperature

compensation.Processtemperaturecompensationiseffectiveif“T.C.ORPmV/°C”in“Temp.

Coef.” is set.

n Temperature compensation

ThiscompensationofpHvalueisperformedontheNernstequation.

Two methods can be used: Automatic and Manual. Select Automatic when a temperature

element is used, or select Manual when a manually set temperature is used.

NOTE

When Manual is selected on the Temperature compensation, a process temperature should be

set in the “Manual temp.” A temperature shown on the Main display or the Home display is this

manually set temperature.

n Reference temperature

SetareferencetemperaturetowhichthemeasuredpHvaluemustbecompensated.Normally

25°C is used, so this temperature is chosen as the default value.

n Process temperature compensation

Selectatemperaturecompensationmethod.“None”doesnotperformthetemperature

compensation.

If “pH” is selected in “Sensor type,” choose process temperature compensation from among

None,TC,Matrix,andNEN6411.If“ORP”isselectedin“Sensortype,”chooseitfromamong

NoneandTC.

l TC

This method uses the linear compensation function.

Itispossibletoadjustthetemperaturecoefcient(TC)factordirectly.Ifthetemperature

coefcientfactorofthesampleliquidisknownfromlaboratoryexperimentsorhasbeen

previously determined, it can be entered here.

ThisTCisapHvariationto1°C(∆pH/∆T).Adjustthevaluebetween-0.1to0.1pH/ºC.

In combination with the reference temperature setting, a linear compensation function is

obtained, which is suitable for all kinds of chemical solutions.

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 245 246

Sin comentarios

Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual de usuario Pagina 58