VEGA VEGAPULS 66 (≥ 2.0.0 - ≤ 3.8) standpipe ver. 4 … 20 mA_HART four-wire - Manual (Page 10)

3.2 Principle of operation
VEGAPULS 66 is a radar sensor in C-band (emitting frequency
approx. 6 GHz) for continuous level measurement.
A special version of VEGAPULS 66 is available for each area of
application. The version with flange and standpipe is particularly
suitable for the measurement of solvents and liquid gases.
T he standpipe antenna is also suitable for vessels with foam
generation or for measurement of products with low dielectric figures
(DK > 1.6).
M easurement in a standpipe is not recommended for very adhesive
products.
F or pressures up to 160 bar (2320 psi) and temperatures up to 400 °C
(752 °F) there are graphite seals and ceramic antenna cones
available.
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.
F our-wire electronics with separate power supply.
T he supply voltage range can differ depending on the instrument
version.
T
he data for power supply are specified in chapter "Technical data".
M easured value transmission is carried out via the 4 … 20 mA/HART
output separate from power supply.
T he background lighting of the indicating and adjustment module is
powered by the sensor. A certain level of operating voltage is required
for this. You can find the exact voltage specifications in chapter
"
Technical data".
3.3 Operation
VEGAPULS 66 can be adjusted with different adjustment media:
l
with indicating and adjustment module
l
with the suitable VEGA DTM in conjunction with an adjustment
software according to the FDT/DTM standard, e.g. PACTware and
PC
l
with manufacturer-specific adjustment programs AMS™ or PDM
l W ith a HART handheld
T he entered parameters are generally saved in VEGAPULS 66,
optionally also in the indicating and adjustment module or in
PACT
ware.
Application area
Functional principle
Power supply
10 VEGAPULS 66 standpipe version • 4 … 20 mA/HART four-wire
3 P roduct description
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