VEGA VEGABAR 83 4 … 20 mA_HART - Operating Instructions - Manual (Page 9)

9
3 Product description
VEGABAR 83 • 4 … 20 mA/HART
45034-EN-131010
•
Absolute pressure
•
Vacuum
Measured products are gases, vapours and liquids.
VEGABAR 83 is especially suitable for applications with higher tem-
peratures and high pressures.
The process pressure acts on the sensor element via the process
diaphragm and an internal transmission liquid. The process pressure
causes a resistance change which is converted into a corresponding
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.
1
3 4
2
Fig. 3: Configuration of the measuring system with piezoresistive sensor ele-
ment
1 Sensor element
2 Base element
3 Transmission liquid
4 Process diaphragm
With small measuring ranges or higher temperatures, the METEC ®
measuring cell is the measuring unit. It consists of the ceramic-capac-
itive CERTEC ® measuring cell and a special, temperature-compen-
sated chemical seal system.
4 3 2 1
Fig. 4: Configuration of the METEC ® measuring cell
1 Process diaphragm
2 Isolating liquid
3 FeNi adapter
4 CERTEC ® measuring cell
Measured products
Measuring system