VEGA VEGAPULS SR 68 Modbus and Levelmaster protocol - Manual (Page 11)

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3 Product description
VEGAPULS SR 68 • Modbus and Levelmaster protocol
41371-EN-130624
The instrument contains two different electronics in its housing cham-
bers:
•
The Modbus electronics for power supply and communication with
the Modbus-RTU
•
The sensor electronics for the actual measuring tasks
2
1
Fig. 5: Position of Modbus and sensor electronics
1 Modbus electronics
2 Sensor electronics
This operating instructions manual applies to the following instrument
versions:
•
Hardware from 2.1.0
•
Software from 4.5.1
The scope of delivery encompasses:
•
Radar sensor
•
Documentation
– this operating instructions manual
– Test certificate Measurement accuracy, depending on the
instrument VEGAPULS SR 68 (optional)
– Operating instructions manual "DIsplay and adjustment module
PLICSCOM" (optional)
– Supplementary instructions manual "Heating for display and
adjustment module" (optional)
– Supplementary instructions manual "Plug connector for con-
tinuously measuring sensors" (optional)
– Ex-specific "Safety instructions" (with Ex versions)
– if necessary, further certificates
3.2 Principle of operation
The VEGAPULS SR 68 is a radar sensor for continuous measurement
of bulk solids also under difficult process conditions. It is particularly
suitable for level measurement in high silos and large bunkers.
The instrument is also suitable for applications in liquids.
The antenna of the radar sensor emits short radar pulses with a
duration of approx. 1 ns. These pulses are reflected by the product
and received by the antenna as echoes. The transit time of the radar
pulses from emission to reception is proportional to the distance and
hence to the level. The determined level is converted into an appropri-
ate output signal and outputted as measured value.
Electronics design
Scope of this operating
instructions manual
Scope of delivery
Application area
Functional principle