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Section 6 • Instrument Calibration
Temperature Calibration Screen
The temperature calibration group of screens allows the
user to change the temperature units displayed on the
screen as well as calibrate temperature instruments.
Four Temperature units are available for display:
• Fahrenheit
• Celsius or Centigrade
• Kelvin (Absolute Celsius temperature scale)
• Rankine (Absolute Fahrenheit temperature scale)
Temperature units can be changed by touching on the
list selector in any temperature calibration screen and
using the up, down, and enter buttons. Changing the
temperature display units also converts all temperature
setpoints to the new selected units.
6 – 4
Figure 6-4. Temperature Calibration Screen
Blower Package PLC Operation Manual •Vilter/Emerson • 35391BLP
CALIBRATE TEMPERATURE INSTRUMENTS
There two types of temperature instruments that can be
calibrated, RTDs and temperature transmitters.
To calibrate an RTD, proceed with the following steps.
Typically, RTDs are very accurate and do not require
calibration.
1.
Expose the RTD to a known temperature (such as a
slurry of crushed ice and water).
2.
Enter an offset so the displayed temperature is
equal to the known temperature.
To calibrate a temperature transmitter, proceed with
the following steps.
1.
Enter the raw mA range (typically 4-20mA).
2.
Enter the span of the transmitter in degrees
Fahrenheit. For a 32-392 Fahrenheit transmitter,
Enter "32" for XDCR Min and "392" for XDCR Max.
NOTE
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