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6.1.2 Configure Lower Range Value (LRV) and Upper Range
Value (URV)
Display OFF-LINE MAINT > OFF-LINE CONFG > IO > AO 1/2 > 4 mA
OFF-LINE MAINT > OFF-LINE CONFG > IO > AO 1/2 > 20 mA
ProLink II ProLink > Configuration > Analog Output > Primary/Secondary Output > Lower Range Value
ProLink > Configuration > Analog Output > Primary/Secondary Output > Upper Range Value
Field Communicator Configure > Manual Setup > Inputs/Outputs > mA Output X > mA Output Settings > PV/SV LRV
Configure > Manual Setup > Inputs/Outputs > mA Output X > mA Output Settings > PV/SV URV
Overview
The Lower Range Value (LRV) and Upper Range Value (URV) are used to scale the mA output,
that is, to define the relationship between mA Output Process Variable and the mA output
level.
Note
If you change LRV and URV from the factory default values, and you later change mA Output Process
Variable, LRV and URV will not be reset to the default values. For example, if you set mA Output Process
Variable to Mass Flow Rate and change the LRV and URV, then you set mA Output Process Variable to
Density, and finally you change mA Output Process Variable back to Mass Flow Rate, LRV and URV for Mass
Flow Rate are reset to the values that you configured.
Procedure
Set LRV and URV as desired.
• LRV is the value of mA Output Process Variable represented by an output of 0 or 4 mA. The
default value for LRV depends on the setting of mA Output Process Variable. Enter LRV in
the measurement units that are configured for mA Output Process Variable.
• URV is the value of mA Output Process Variable represented by an output of 20 mA. The
default value for URV depends on the setting of mA Output Process Variable. Enter URV in
the measurement units that are configured for mA Output Process Variable.
Tips
For best performance:
• Set LRV ≥ LSL (lower sensor limit).
• Set URV ≤ USL (upper sensor limit).
• Set these values so that the difference between URV and LRV is ≥ Min Span (minimum span).
Defining URV and LRV within the recommended values for Min Span, LSL, and USL ensures that the
resolution of the mA output signal is within range of the bit precision of the D/A converter.
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