Vega VEGABAR 61 4 … 20 mA_HART Bedienungsanleitung PDF herunterladen (Seite 9)

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

The VEGABAR 61 is a pressure transmitter with isolating diaphragm

for pressure measurement of highly corrosive and hot liquids.

The 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.

The 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.

Two-wire electronics 4 … 20 mA/HART for power supply and

measured value transmission over the same cable.

The supply voltage range can diﬀer depending on the instrument

version.

The data for power supply are speciﬁed in chapter "Technical data".

The 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 Product description

27519-EN-081209

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Vega VEGABAR 61 4 … 20 mA_HART Bedienungsanleitung Seite 9