VEGA VEGAFLEX 67 (-200…+400°C) 4 … 20 mA_HART four-wire - Manual (Page 10)

TS
d1
h1
h2
d2
1
L2
L1
Fig. 2: Interface measurement
1 Reference plane
d1 Distance to the interface (HART value 1)
d2 Distance to the level (HART value 3)
TS
Thickness of the upper medium (d1 - d2)
h1 Height - Interface
h2 Height - Level
L1
Lower medium
L2 Upper medium
T he interface is processed directly by the sensor.
T he analogue output (4 … 20 mA) transmits the height of the interface
( h1) in percent. This is also the value that is adjusted.
T he display of PLICSCOM and PACTware outputs the distance to the
interface (d1) in m(d).
T he HART protocol can transmit the distance to the interface - HART
value 1 (d1) and the distance to the level (d2) - HART value 3.
T he values can be processed e.g. with a HART interface module (HIM)
or with a VEGAMET 625. VEGAMET 625 can also generate the
difference out of the two values.
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.
Output signal
Voltage supply
10 VEGAFLEX 67 • 4 … 20 mA/HART - four-wire
3 P roduct description
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