Vega VEGAPULS 66 Operating Instructions Manual page 13

Functional principle
Power supply and bus com-
munication
GSD/EDD
VEGAPULS 66 standpipe version - Profibus PA
For pressures up to 160 bar (2320 psi) and temperatures up to
400 °C (752 °F), the graphite seal and the ceramic antenna
cone are available.
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 supply via the Profibus DP/PA segment coupler or
VEGALOG 571 EP cards. A two-wire cable according to
Profibus specification serves as carrier of both power and
digital data signals for multiple sensors. The instrument profile
of VEGAPULS 66 corresponds to profile specification version
3.0.
The GSD (instrument master files) and bitmap files necessary
for planning your Profibus-DP-(PA) communication network
are available from the download section on the VEGA
homepage www.vega.com under "Services - Downloads -
Software - Profibus". There you can also find the appropriate
certificates. In a PDM environment, an EDD (Electronic Device
Description) is also required to enable the full range of sensor
functions (also available as a download).A CD with the
appropriate files can be ordered via e-mail under info@de.
vega.com 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. Requirement is a certain height of the
supply voltage.
The data for power supply are stated in chapter "Technical
data" in the "Supplement".
For instruments with national approvals such as e.g. according
to FM and CSA, this function only available at a later date.
The optional heating requires its own power supply. You can
find further details in the supplementary instructions manual
"Heating for indicating and adjustment module".
This function is generally not available for approved instru-
ments.
Product description
13