<8. CALIBRATION OF SC (Conductivity)>
8-3
IM 12A01A02-01E 8th Edition : Oct. 01, 2015-00
Press [Take Sample] to record a collected sample value in memory. Re-enter the Sample Cal.
screen and press [Start calibration] to perform a sample calibration. This updates the recorded
data.
8.5 Temperature coefcient
Simply input the solution conductivity at the reference temperature (TR) after allowing the sensor
to stabilize at elevated temperatures. The FLXA202/FLXA21 will calculate the temperature
coefcient for you. The ideal temperature for this calibration is the normal process value (TP).
This calibration is enabled if the Temperature Compensation is set to “TC.” (Section 7.1.4)
8.6 Temperature calibration
In order to make the most accurate measurements, it is important to have a precise temperature
measurement. This affects the display of temperature, and the output signal (when used). More
important, however, is the temperature compensation, and calibration accuracy.
The temperature of the sensor system should be measured independently with a high precision
thermometer. The value of “Measured temperature” should then be adjusted to agree with the
reading (zero offset calibration only).
For best accuracy, this should be done as near to the normal operating temperature as possible.
8.7 HOLD
The FLXA202/FLXA21 has a function to hold the mA output at a preset value (default: “Last”).
Use this menu to hold the output.
For the settings, see “n Congure Hold” on page 7-8.
During commissioning or quick setup, the output is automatically held.
Setting “Hold during Calibration” to “Disabled” deactivates the hold function during calibration.
Press
to select Execute: HOLD and then choose Manual Hold ON or Manual Hold OFF.
This allows you to set up manual hold.
10.00
Tag:SC
25.0
4mA 20mAConduct1-TC1
°C
mS/cm
HOLD
Figure 8.8 Example of the display with the manual hold enabled
To cancel manual hold, press the lit
section on the Main display.
SC
8
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