Endress+Hauser Deltabar FMD72 - Page 49

Deltabar FMD71, FMD72 Commissioning
Endress+Hauser 49
9.10.2 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
→  86: %, level,
volume or mass
units.
• Calibration with
reference pressure
(wet calibration)
→  49
• Calibration without
reference pressure
(dry calibration),
→  51
The measured value
display and the "Level
before lin (019)"
parameter →  84show
the measured value.
Calibration is
performed by
entering the
density and two
height-level value
pairs.
"In height" • Calibration with
reference pressure
(wet calibration)
→  53
• Calibration without
reference pressure
(dry calibration),
→  54
9.10.3 "In pressure" level selection 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 derived from the level and the density of the medium. In this
situation, the device sets the pressure range 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.
The values entered for "Empty calib./Full calib.", "Set LRV/Set URV", and the applied
pressures must be at least 1% apart. The value will be rejected, and a warning
message displayed, if the values are too close together. Further limit values are not
checked, i.e. the values entered must be appropriate for the sensor module and the
measuring task for the device to be able to measure correctly.
Description
1 Perform a "position adjustment" →  81.
A
B
A0017661
A See table, step 7.
B See table, step 8.
2 Select the "Level" measuring mode via the
"Measuring mode (005)" parameter.
Menu path: Setup → Measuring mode
3 Select a pressure engineering unit via the
"Press eng. unit (125)" parameter, here "mbar"
for example.
Menu path: Setup → Press. eng. unit
4 Select the "In pressure" level mode via the
"Level selection (024)" parameter.
Menu path: Setup → Extended setup → Level →
Level selection
5 Select a level unit via the "Unit before lin.
(025)" parameter, here "m" for example.
Menu path: Setup → Extended setup → Level →
Unit before lin.