VEGA VEGAPULS 68 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART two-wire - Manual (Page 9)

l H orn or parabolic antenna
l
process fitting (depending on the version flange or thread)
l
optionally available with swivelling holder, purging air connection,
reflux valve
l H ousing with electronics, optionally available with plug connector,
optionally available with connection cable
l H ousing cover, optionally available with indicating and adjustment
module PLICSCOM
T he components are available in different versions.
T he type label contains the most important data for identification and
use of the instrument:
l S ensor type
l A rticle and serial number device
l A rticle numbers documentation
l T echnical data: Approvals, antenna type, process fitting, process
seal/temperature, signal output, voltage supply, protection, pro-
tection class
l SIL
identification (with SIL rating ex works)
W ith the serial number, you can access the delivery data of the
instrument via www.vega.com, "VEGA Tools" and "serial number
search". In addition to the type label outside, you can also find the
serial number on the inside of the instrument.
3.2 Principle of operation
VEGAPULS 68 is a radar sensor in K-band technology for continuous
level measurement of solids.
A version of VEGAPULS 68 is available for each area of application:
l T he version with horn antenna is particularly suitable for
measurement of virtually all bulk solids in small silos and vessels.
l T he version with parabolic antenna is particularly suitable for large
silos and vessels with up to 70 m (76 yd) measuring distance and
for measurement of solids with low dielectric constant.
VEGAPULS 68 is also suitable for applications in liquids.
T he 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.
T
wo-wire electronics 4 … 20 mA/HART for power supply and
measured value transmission over the same cable.
T he supply voltage range can differ depending on the instrument
version.
Type label
Application area
Functional principle
Power supply
VEGAPULS 68 • 4 … 20 mA/HART two-wire 9
3 P roduct description
29261
-EN
-090305