User Manual

<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.