Deltabar FMD72
Product description
11
3.2
Function
3.2.1
Differential pressure generation
The measurement chain for the calculation of the differential pressure can be represented by the
following diagram:
P
HP
LP
Pressure
simulation
HP
Differential
pr
pressure inversion
Position
correction
(Calib.offset)
Diff.
pressure
simulation
Damping
Corrected
press.
Pressure
after
damping
Meas.
diff. pressure
Meas.
pressure HP
Meas.
pressure LP
Pressure
simulation
LP
Sensor
Trimm
HP
Sensor
calibration
HP
Sensor pressure HP
Sensor pressure LP
Sensor
Trimm
LP
Sensor
calibration
LP
A0017360-EN
All the process values represented on the diagram are updated in a measurement cycle. The sensor
module allocation is determined by the configuration when setting up the device. The connection
to the transmitter defines the corresponding sensor module as the master. After commissioning, the
second sensor module is detected as the slave. This configuration can be modified as desired.
However, a modification must take place with the unit disconnected from the power supply.
The sensor modules have a designation independent of the master/slave configuration. This indicates
where the sensor module is typically installed:
• Sensor module LP
LP = Low pressure; top
• Sensor module HP
HP = High pressure; bottom
For identical sensor module ranges, this assignment can likewise be changed, but this then has to
be configured in the menu.
If you change both sensor modules or the electronics, this allocation must likewise be carried
out. See "Connect transm. (286)" parameter .
3.3
Registered trademarks
3.3.1
HART
â
Registered trademark of the HART Communication Foundation, Austin, USA
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