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Reference Manual
00809-0100-4027, Rev AA
December 2005
3-15
Rosemount 4500
Scaled Variable
Configuration
The scaled variable configuration allows the user to create a
relationship/conversion between the pressure reading and custom units.
The scaled variable configuration defines the following items:
• Scaled variable units - Custom units to be displayed.
• Scaled data options - Defines the transfer function for the application
a. Linear
b. Square root
• Pressure value position 1 - Lower known value point (possible 4 mA
point) with consideration of linear offset.
• Scaled variable value position 1 - Custom unit equivalent to the lower
known value point (The lower known value point may or may not be the
4 mA point.)
• Pressure value position 2 - Upper known value point
(possible 20 mA point)
• Scaled variable value position 2 - This is the custom unit equivalent to
the upper known value point (possible 20 mA point)
• Linear offset - The value required to zero out pressures effecting the
desired pressure reading.
NOTE
If Scaled Variable is mapped as the primary variable and square root mode is
desired, select Square Root during Scaled Variable Configuration or as part of
the set output configuration. Avoid duplication of Square Root configuration.
Fast Keys
1, 4, 3, 4, 7