VEGA VEGABAR 61 4 … 20 mA_HART - Manual (Page 9)

3
2
1
Fig. 1: Example of a VEGABAR 61 with flange connection DN 50 PN 40 and
plastic housing
1
Housing cover with integrated indicating and adjustment module (optional)
2 Housing with electronics
3 Process fitting with measuring cell
3.2 Principle of operation
T he VEGABAR 61 is a pressure transmitter with isolating diaphragm
for pressure measurement of highly corrosive and hot liquids.
T he sensor element for measuring ranges up to 60 bar is the
CERTEC
® measuring cell with rugged ceramic diaphragm. The
hydrostatic pressure of the product or the process pressure causes a
capacitance change in the measuring cell via the metal process
diaphragm and the isolating system.
1)
T he sensor element for measuring ranges from 100 bar is a wire strain
gauge (DMS) on the rear of the process diaphragm. There, the
process pressure causes a resistance change, which is converted into
an appropriate output signal.
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".
1) T he isolating system protects the sensor against corrosive products and
high temperatures. By selecting suitable diaphragm materials and isolating
liquids, systems with a temperature resistance up to 400 °C (752 °F) can be
achieved.
Application area
Functional principle
Power supply
VEGABAR 61 • 4 … 20 mA/HART 9
3 P roduct description
27519
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EN
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