Vega VEGABAR 81 Profibus PA - Operating Instructions Bedienungsanleitung PDF herunterladen (Seite 9)

3 Product description

VEGABAR 81 • Probus PA

45020-EN-131107

•

Gauge pressure

•

Absolute pressure

•

Vacuum

Measured products are gases, vapours and liquids.

The chemical seal systems of VEGABAR 81, which are optimally

adapted to the process, also allow measurement of highly corrosive

and hot products.

The process pressure acts on the sensor element via the stainless

steel diaphragm and an internal transmission liquid. The process

pressure causes a resistance change which is converted into a cor-

responding output signal and outputted as measured value.

Measuring ranges up to 16 bar: piezoresistive sensor element, meas-

uring ranges up to 25 bar: strain gauge (DMS) sensor element.

3 4

Fig. 3: Conguration of the piezoresistive measuring cell

1 Sensor element

2 Base element

3 Diaphragm

4 Silicone oil lling

The measuring cell design depends on the selected pressure type.

Relative pressure: the measuring cell is open to atmosphere. The

ambient pressure is detected in the measuring cell and compensated.

It thus has no inuence on the measured value.

Absolute pressure: the measuring cell is evacuated and encapsu-

lated. The ambient pressure is not compensated and does hence

inuence the measured value.

Relative pressure, climate-compensated: the measuring cell is

evacuated and encapsulated. The ambient pressure is detected

through a reference sensor in the electronics and compensated. It

thus has no inuence on the measured value.

The measuring system is completely welded and hence sealed

against the process. The sealing of the process tting against the

process is carried out by a seal provided on site.

Measured products

Measuring system

Pressure types

Seal concept

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 83 84

Kommentare zu diesen Handbüchern

Keine Kommentare

Vega VEGABAR 81 Profibus PA - Operating Instructions Bedienungsanleitung Seite 9

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Ausrüstung Vega VEGABAR 81 Profibus PA - Operating Instructions