4 Function description
4.1 Functional principle
4.1.13
Electronic evaluation
The electronic unit receives signals from the sensors and calculates the measured values which are in-
dicated in the display unit and which can be called up at the analog output or at the Modbus interface.
Possibilities of the electronic unit:
o
Language selection
o
Display of the measured values in different units (volumes, masses and temperatures)
o
Averaged display values
o
Up to 2 density tables with 10 value pairs each that correspond to the liquid specifications
o
Adaptation of the density tables if the analysis of the liquid requires other settings
o
density calculation
o
Linearization table with up to 7 preset K-factors per flowmeter
o
Information message at faults or invalid inputs
o
2 scalable and assignable analog outputs 0 – 10 V or 4 – 20 mA
o
2 scalable and assignable pulse outputs 24 V
o
2 adjustable relay outputs
4.1.14
Modbus connection
The electronic unit can be connected to the system by means of a Modbus interface and can thus be
integrated into existing systems. This ensures simple, reliable and rapid data exchange.
4.1.15
Applications
Different extension stages of the electronic unit are presented on the basis of the following examples.
This allows the required functional scope to be selected in accordance with the requirements.
Single-line measurement
Extension stage
Components
Functions
000135
Basic
o
1 flowmeter
o
1 pick up
o
1 BEM 300 electronic unit
o
Electronic evaluation
o
Volume measurement
o
1 analog output
o
1 pulse output
000136
Basic + temperature com-
pensation
o
1 flowmeter
o
1 pick up
o
1 temperature sensor Pt100
o
1 BEM 500 electronic unit
o
Electronic evaluation
o
Volume measurement
o
Mass flow measurement
o
Temperature compensation
o
2 relay outputs
o
2 analog outputs
o
2 pulse outputs
o
Filling
000137
Basic + flow direction detec-
tion
o
1 flowmeter
o
2 pick ups
o
1 BEM 300 electronic unit
o
Electronic evaluation
o
Volume measurement
o
Flow direction detection
o
1 analog output
o
1 pulse output
000138
Basic + flow direction detec-
tion + temperature compens-
ation
o
1 flowmeter
o
2 pick ups
o
1 temperature sensor Pt100
o
1 BEM 500 electronic unit
o
Electronic evaluation
o
Volume measurement
o
Flow direction detection
o
Mass flow measurement
o
Temperature compensation
o
2 relay outputs
o
2 analog outputs
o
2 pulse outputs
o
Filling
Tab. 6: Extension stages single-line measurement
12
OIE 12en-GB Edition 2020-03
Operating instructions