Rosemount 2088 - 5.6 Trim the Analog Output; 5.6.1 Performing Digital-to-Analog Trim (4-20 mA; 1-5 V Output Trim); 5.6.2 Performing Digital-to-Analog Trim (4-20 mA; 1-5 V Output Trim) Using Other Scale

20
Reference Manual
00809-0100-4108, Rev CA
Configuration
March 2017
Configuration
Scaled Variable. The first use case is to allow custom units to be displayed on the
transmitter's LCD/LOI Display. The second use case is to allow custom units to drive the
transmitter's 4–20 mA (1–5 Vdc) output.
If the user desires custom units to drive the 4–20 mA (1–5 Vdc) output, Scaled Variable
must be re-mapped as the primary variable. Refer to “Re-mapping device variables” on
page 21.
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
 Pressure value position 1 - Lower known value point with consideration of linear offset.
 Scaled Variable value position 1 - Custom unit equivalent to the lower known value point.
 Pressure value position 2 - Upper known value point
 Scaled Variable value position 2 - Custom unit equivalent to the upper known value point
 Linear offset - The value required to zero out pressures effecting the desired pressure
reading.