Instruction Manual
D102748X012
DLC3010 Digital Level Controller
Configuration
May 2018
43
Ranging
Field Communicator Configure > Manual Setup > Ranging (2-2-3)
Follow the prompts on the Field Communicator to view or edit ranging information.
D Upper Sensor Limit indicates the maximum usable value for a Range Value.
D Lower Sensor Limit indicates the minimum usable value for a Range Value.
D Minimum Span is the difference between the Upper Range Value and the Lower Range Value below which
amplification of instrument errors may become a concern. This effect should be considered when sizing displacer /
torque tube.
D Upper Range Value defines the operational end point from which the Analog Value and the 100% point of the
percent range are derived. The device will output 20 mA when the PV is equal to the Upper Range Value.
D Lower Range Value defines the operational end point from which the Analog Value and the 0% point of the percent
range are derived. The device will output 4 mA when the PV is equal to the Lower Range Value.
D Change Action allows you to change the analog output action: Direct/Reverse. For Reverse action, the Upper Range
Value and Lower Range Value will be swapped.
D Level Offset is the Primary Variable value you want the instrument to report when physical level is at the bottom of
displacer.
Note
Level Offset and Set Level Offset are
only available in Liquid Level or Interface Level measurement mode.
D Set Level Offset adding a level offset permits the process variable value in engineering units to be reported with
respect to a reference point other than the bottom of the displacer (see figure 4‐3). Examples include: bottom of
the process vessel, the process set point, or sea level.
Follow the prompts on the Field Communicator to enter the offset value. The procedure will offer to shift the range
values and alert thresholds by the amount of the level offset for you. This will keep the 4-20 mA output aligned with
the top and bottom of the displacer. If you have already shifted the range values and alert thresholds to account for
the effect of the offset you are adding select No when asked if you want to 'Proceed changing range values and alert
thresholds'.
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