Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 - Manual (Page 96)

<7. COMMISSIONING OF SC (Conductivity)>
7-4
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
7.1.4 Temperature compensation
l Temperature compensation
Two methods can be used: Automatic and Manual. Select Automatic when a temperature
element is used or 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.
l Reference temperature
Set a reference temperature to which the measured value must be compensated. Normally 25°C
is used, so this temperature is chosen as the default value.
l Process temperature compensation
Select a temperature compensation method from among None, TC, NaCl, and Matrix. “None”
does not perform the temperature compensation.
l TC
This method uses the linear compensation function.
For how to calculate a temperature coefficient of the compensation function, see “l Configure
calculated temperature coefficient (TC).” on page App.2-1.
l NaCl
This method uses the standard temperature compensation function with NaCl solution.
For details, see “l NaCl or standard temperature compensation” on page App.2-1.
l Matrix
This method uses the temperature compensation matrix, which is a table of the conductivity
values at different temperatures and concentrations for a specific solution. The measured
conductivity is compensated based on this matrix to the conductivity at the reference
temperature.
Prepared matrixes and user-defined matrixes can be used. Two different user-defined
matrixes are available.
For details, see “l Matrix compensation” on page App.2-3.
When the measured temperature or the precompensated conductivity is out of the range, the
temperature compensation error (warning) will be issued. This is not a device error.
For more details, see “■ Temperature compensation error” on App. 2-8.
Any two of these three methods can be set for conductivity measurement as “Temp.comp.1” and
“Temp.comp.2”. The result of either method can be output or displayed (see “7.2 Output setup” or
“7.6 Display setup”).
When “Measurement” is set to “Conduct. + Concentr.” for the Measurement, only one method
can be set.