VEGA VEGABAR 65 Foundation Fieldbus - Manual (Page 8)

2
1
3
Fig. 1: Example of a VEGABAR 65 with process fitting G1½ A and plastic
housing
1 Housing cover with integrated PLICSCOM (optional)
2 Housing with electronics
3 Process fitting with measuring cell
3 .2 Principle of operation
VEGABAR 65 is a pressure transmitter for use in the chemical, food
processing and pharmaceutical industries. Depending on the version,
it is used for level, gauge, absolute pressure or vacuum measurement.
Measured products are gases, vapours and liquids, also those with
higher temperatures.
The METEC
®
measuring cell is the measuring unit. It consists of the
ceramic-capacitive CERTEC
®
measuring cell and a special, temper-
ature-compensating isolating system.
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 liquid. This change is converted
into a corresponding output signal.
Power is supplied via the H1 Fieldbus. A two-wire cable according to
Fieldbus specification serves as carrier of both power and digital data
for multiple sensors. This cable can be operated in two versions:
l via an H1 interface card in the control system and additional power
supply
l via a Linking device with HSE (High speed Ethernet) and
additional power supply according to IEC 61158-2
The DD (Device Descriptions) and CFF (capability files) necessary for
planning and configuration of your FF (Foundation Fieldbus) commu-
nication network are available in the download area of the VEGA
homepage www.vega.com under "S
ervices - Downloads - Software -
Application area
Functional principle
Power supply and bus
communication
DD/CFF
8 VEGABAR 65 • Foundation Fieldbus
3 Product description
28260
-EN
-090522