User's Manual

Page 84 SITRANS LR250 (HART) – INSTRUCTION MANUAL 7ML19985JE03
mmmmm
Parameters
2.6. Analog Output Scaling
2.6.1. Current Output Function
Can be set to either Level, Space, Distance, or Volume. (The device can carry
out a volume calculation only after a vessel shape has been specified.)
To view the mA reading in the secondary region of the LCD, press on the
handheld programmer.
To modify Current Output Function via SIMATIC PDM:
• Open the menu Device – Select Analog Output. (See
Select Analog Output
on page 55 for more detail.)
Notes:
• Level, space, and distance, have different reference points.
• Use caution when changing Current Output Function while the device is
connected to a HART network. Current Output Function controls the
primary value and the loop current for the device.
• Current Output Function also affects the secondary, tertiary and
quaternary variables in a HART network.
Options Reference point Description
* Level Low Calibration Point measured as a percentage of the
difference between High Calibration Point
and Low Calibration Point
Space High Calibration Point
Distance sensor reference point
measured as a percentage of Low
Calibration Point
Volume converts a level measurement to a volume output
Manual
a)
(LUI only)
a)
Current Output Function must be set to Manual before modifying mA Output Value
(2.6.6.). Remember to restore the previous Current Output Function setting after
modifying mA Output Value.
allows mA Output Value (2.6.6.) to be set to a user-defined value
Level Space Distance
Distance
Space
Level
20 mA
100%
4 mA
0%
High
Cal.
Point
4 mA
0%
20 mA
100%
4 mA
0%
20 mA
100%
Sensor
ref.
pt.
Low
Cal.
Pt.