Process variable Label
Display ProLink III Field communicator
Wobbe Index WOBBE Wobbe Index Wobbe Index
Energy Flow ENRGY Energy Flow Energy Flow
10.2.2 Configure Lower Range Value (LRV) and Upper Range Value
(URV)
ProLink III Device Tools → Configuration → I/O → Outputs → mA Output → mA Output 1 → Lower Range Value
Device Tools → Configuration → I/O → Outputs → mA Output → mA Output 1 → Upper Range Value
Device Tools → Configuration → I/O → Outputs → mA Output → mA Output 2 → Lower Range Value
Device Tools → Configuration → I/O → Outputs → mA Output → mA Output 2 → Upper Range Value
Field communicator Configure → Manual Setup → Inputs/Outputs → mA Output 1 → mA Output Settings → PV LRV
Configure → Manual Setup → Inputs/Outputs → mA Output 1 → mA Output Settings → PV URV
Configure → Manual Setup → Inputs/Outputs → mA Output 2 → mA Output Settings → SV LRV
Configure → Manual Setup → Inputs/Outputs → mA Output 2 → mA Output Settings → SV URV
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.
Prerequisites
Ensure that mA Output Process Variable is set to the desired process variable. Each process variable has its
own set of LRV and URV values. When you change the values of LRV and URV, you are configuring values for
the currently assigned mA Output process variable.
Ensure that the measurement unit for the configured process variable has been set as desired.
Procedure
Set LRV and URV as desired.
• LRV is the value of mA Output Process Variable represented by an output of 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.
Tip
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 the range of the bit precision of the D/A converter.
Integrate the meter with the control system Configuration and Use Manual
March 2021 MMI-20020954
88 Micro Motion Gas Specific Gravity Meters (SGM)
To Next Page