Emerson 4500 manual Scaled Variable Configuration

Reference Manual

00809-0100-4027, Rev AA December 2005

Rosemount 4500

Scaled Variable

Configuration

Fast Keys 1, 4, 3, 4, 7

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.

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