Endress+Hauser Deltabar FMD72 - Page 34

Commissioning Deltabar FMD72
34 Endress+Hauser
10.7.2 Overview of level measurement
Measuring task Level
Selection
Measured variable
options
Description Measured value
display
Calibration is
performed by entering
two pressure-level
value pairs.
"In pressure" Via the "Unit before lin.
(025)" parameter : %,
level, volume or mass
units.
• Calibration with
reference pressure (wet
calibration)(® ä 34)
• Calibration without
reference pressure (dry
calibration)(® ä 34)
The measured value
display and the "Level
before lin (019)"
parameter show the
measured value.
Calibration is
performed by entering
the density and two
height-level value
pairs.
"In height" • Calibration with
reference pressure (wet
calibration)(® ä 37)
• Calibration without
reference pressure (dry
calibration)(® ä 37)
10.7.3 "In pressure" level selection Calibration with reference pressure (wet
calibration)
See the Operating Instructions BA01044P on the CD-ROM provided.
10.7.4 "In pressure" level selection Calibration without reference pressure (dry
calibration)
Example:
In this example, the volume in a tank should be measured in liters. The maximum volume of
1000 liters (264 gal) corresponds to a pressure of 450 mbar (6.53 psi). The minimum volume
of 0 liters corresponds to a pressure of 50 mbar (0.73 psi) since the device is mounted below the
start of the level measuring range.
Prerequisite:
• The measured variable is in direct proportion to the pressure.
• This is a theoretical calibration i.e. the pressure and volume values for the lower and upper
calibration point must be known.