Deltabar FMD71, FMD72
Integrating transmitter via HART
®
protocol
Endress+Hauser 41
Process variable Pressure Level
Linear Table active
Third process variable
(Tertiary Variable (TV))
5
(Measured
pressure LP)
2
(Measured
pressure HP)
2
(Measured
pressure HP)
Fourth process variable
(Quaternary Variable (QV))
4
(Sensor
temperature HP)
5
(Measured
pressure LP)
5
(Measured
pressure LP)
The assignment of the device variables to the process variable is displayed in the
Expert → Communication → HART output menu.
The assignment of the device variables to the process variable can be changed using
HART command 51.
All four process variables must be assigned (PV, SV, TV, QV).
Sample data entry "Data (hex): 00010407"
• 00 = PV = Differential pressure measured (cannot be changed)
• 01 = SV = Corrected pressure
• 04 = TV = Sensor temperature HP
• 07 = QV = Sensor temperature LP
An overview of the possible device variables can be found in the following section.
8.2 Device variables and measured values
The following measured values are assigned to the individual device variables:
Device variable code Measured value
0 Measured differential pressure
1 Corrected pressure
2 Measured pressure HP
3 Sensor pressure HP
4 Sensor temperature HP
5 Measured pressure LP
6 Sensor pressure LP
7 Sensor temperature LP
8 Level before linearization
9 Tank content
10 Process density
11 Electronic temperature
12 HART input value
The device variables can be queried by a HART
®
master using HART
®
command 9 or
33.
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