VEGA VEGAPULS 66 (≥ 2.0.0 - ≤ 3.8) enamel 4 … 20 mA_HART two-wire - Manual (Page 10)

3.2 Principle of operation
VEGAPULS 66 is a radar sensor in C-band technology for continuous
level measurement.
T he version with enamelled antenna is particularly suitable for
measurement of highly corrosive liquids, preferably in enamelled
vessels under difficult process conditions such as buildup, conden-
sation and foam generation as well as strong product movement.
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.
T he data for power supply are specified in chapter "Technical data".
T
he backlight of the indicating and adjustment module is powered by
the sensor. The prerequisite for this is a supply voltage at a certain
level. The exact voltage specifications are stated in chapter "Technical
data".
T he 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.
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 enamel • 4 … 20 mA/HART two-wire
3 P roduct description
31953
-EN
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