VEGA VEGAWELL 72 4 … 20 mA_HART PT 100 - Manual (Page 10)

3 .2 Principle of operation
VEGAWELL 72 is used for level and gauge measurement in
wells, basins and atmospherically open vessels particularly in
the water/waste water industry as well as in the shipbuilding
industry.
1)
T
he actual sensor element is the CERTEC ® measuring cell
with rugged ceramic diaphragm. The hydrostatic pressure
causes a capacitance change in the measuring cell via the
ceramic diaphragm. This change is converted into an
appropriate output signal.
T
he CERTEC ® measuring cell is also equipped with a
temperature sensor Pt 100 in four-wire technology. The
resistance value is accessed via the wires of the suspension
cable. The power supply or the processing is carried out via a
temperature transducer, e.g. in the VEGABOX 02.
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.
D ata for power supply are specified in chapter "Technical
data".
3 .3 Operation
VEGAWELL 72 - 4 … 20 mA/HART can be adjusted with
different adjustment media:
l
an adjustment software according to FDT/DTM standard,
e.g. PACTware and PC
l
W ith a HART handheld
T he type of adjustment and the adjustment options depend on
the selected adjustment component. The entered parameters
are generally saved in the respective sensor, when adjusting
with PACTware™ and PC optionally also in the PC.
3 .4 Packaging, transport and storage
Y our instrument was protected by packaging during transport.
I
ts capacity to handle normal loads during transport is assured
by a test according to DIN EN 24180.
1) F or use in closed vessels under vacuum, VEGAWELL 72 is available with
absolute pressure measuring ranges.
Application range
Functional principle
Voltage supply
Packaging
10 VEGAWELL 72 • 4 … 20 mA/HART PT
3 P roduct description
34360
-EN
-080806