VEGA VEGAPULS 61 (≥ 2.0.0 - ≤ 3.8) Foundation Fieldbus - Manual (Page 10)

3 .2 Principle of operation
VEGAPULS 61 is a radar sensor in K-band (emitting frequency
approx. 26 GHz) for continuous level measurement.
The version with encapsulated antenna system is particularly
suitable for level measurement of aggressive liquids in small vessels.
The version with plastic horn antenna is particularly suitable for flow
measurement in open flumes or gauge measurement in bodies of
water.
The electronics with increased sensitivity enables the use of
VEGAPULS
61 also in applications with very poor reflective properties
or products with low ε
r
value.
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 running 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
appropriate output signal and outputted as measured value.
Power is supplied via the H1 Fieldbus. A two-wire cable according to
Fieldbus specification serves as carrier of both power and digital data
for multiple sensors. This cable can be operated in two versions:
l via an H1 interface card in the control system and additional power
supply
l via a Linking device with HSE (High speed Ethernet) and
additional power supply according to IEC 61158-2
The DD (Device Descriptions) and CFF (capability files) necessary for
planning and configuration of your FF (Foundation Fieldbus) commu-
nication network are available in the download area of the VEGA
homepage www.vega.com under "Services - Downloads - Software -
Foundation Fieldbus". The appropriate certificates are also available
there. A CD with the appropriate files and certificates can be ordered
via e-mail under [email protected] or by phone from one of the VEGA
agencies under the order number "DRIVER.S".
The backlight of the indicating and adjustment module is powered by
the sensor. Prerequisite is a certain level of operating voltage.
The data for power supply are specified in chapter "Technical data".
The optional heating requires its own operating voltage. You can find
detailed information in the supplementary instructions manual "Heating
for indicating and adjustment module". This function is generally not
available for approved instruments.
Application area
Functional principle
Power supply and bus
communication
DD/CFF
10 VEGAPULS 61 • Foundation Fieldbus
3 Product description
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