Commissioning Deltabar M 4...20 mA HART
28 Endress+Hauser
5.6 Commissioning of Level measurement
5.6.1 Information on level measurement
!
Note!
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.
• 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.
• 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 message output, if the values are too close together.
5.6.2 Overview of level measurement
5.6.3 Level selection "in pressure"
Calibration with reference pressure (wet calibration)
Example:
In this example, the level in a tank should be measured in "m". The maximum level is 3 m (9.8
ft). The pressure range is set to 0 to 300 mbar (4.5 psi).
Prerequisite:
• The measured variable is in direct proportion to the pressure.
• The tank can be filled and emptied.
!
Note!
The values entered for "Empty calib./Full calib." and" Set LRV/Set URV" must be at least 1%
apart. The value will be rejected, and a message output, if the values are too close together.
Other 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.
Measuring task Level
selection
Measured
variable options
Description Measured value display
Calibration takes place
by entering two
pressure/level value
pairs.
"In pressure" Via the "Output unit"
parameter: %, level,
volume or mass units.
• Calibration with reference
pressure (wet calibration),
→ ä 28
• Calibration without
reference pressure
(dry calibration) → ä 30
The measured value display
and the
"Level before lin" parameter
display the measured value.
Calibration takes place
by entering the density
and two height/level
value pairs.
"In height" • Calibration with reference
pressure (wet calibration),
→ ä 34
• Calibration without
reference pressure
(dry calibration) → ä 31
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