Commissioning Deltapilot M 4...20 mA HART
38 Endress+Hauser
8.5 Level measurement
8.5.1 Information on level measurement
• The limit values are not checked, i.e. the values entered must be appropriate for the sensor
and the measuring task for the device to be able to measure correctly.
• Customer-specific units are not possible.
• There is no unit conversion.
• The values entered for "Empty calib./Full calib.", "Empty pressure/Full pressure", "Empty
height/Full height" and "Set LRV/Set URV" must be at least 1% apart. The value will be
rejected, and a warning message displayed, if the values are too close together.
You have a choice of two methods for calculating the level: "In pressure" and "In height". The table
in the "Overview of level measurement" section that follows provides you with an overview of
these two measuring tasks.
Pos. zero adjust (007)
(Gauge pressure sensor)
Selection
Menu path:
Setup Pos. zero adjust
Position zero adjustment – the pressure difference between zero (set point) and the
measured pressure need not be known.
Example:
– Measured value = 2.2 mbar (0.033 psi)
– You correct the measured value via the "Pos. zero adjust" parameter with the
"Confirm" option. This means that you assign the value 0.0 to the pressure present.
– Measured value (after pos. zero adjust) = 0.0 mbar
– The current value is also corrected.
Options
•Confirm
•Abort
Factory setting:
Abort
Calib. offset (192) / (008)
(absolute pressure sensor)
Entry
Position adjustment – the pressure difference between set point and the measured
pressure must be known.
Example:
– Measured value = 982.2 mbar (14.73 psi)
– You correct the measured value with the value entered (e.g. 2.2 mbar (0.033 psi))
via the "Calib. offset" parameter. This means that you are assigning the value 980.0
(14.7 psi) to the pressure present.
– Measured value (after calib. offset) = 980.0 mbar (14.7 psi)
– The current value is also corrected.
Factory setting:
0.0
Parameter name Description
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