Download Operating Instructions - VEGABAR 51

3 Product description
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Instrument type
Article number instrument
Technical data: Measuring range, process pressure, process
temperature, signal output, voltage supply, protection, protection
class
Order number
Article numbers, documentation
Serial number
The serial number allows you to access the delivery data of the
instrument via www.vega.com, "VEGA Tools" and "serial number
search". In addition to the type label outside, you can also find the
serial number on the inside of the instrument.
Supplementary label
"Oil and grease-free for
oxygen applications"
Instruments in the version "Oil and grease-free for oxygen applications" are equipped with a supplementary label. The supplementary
label contains instructions on oil and grease-free parts of the
instrument.
3.2 Principle of operation
Application area
The VEGABAR 51 is a pressure transmitter with isolating diaphragm
for pressure measurement of highly corrosive and hot liquids.
Functional principle
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. This change is converted into a
corresponding output signal.1)
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.
Power supply and bus
communication
Power supply via the Profibus DP/PA segment coupler or VEGALOG
571 EP cards. A two-wire cable according to Profibus specification
serves as carrier of both power and digital data transmission for
multiple sensors. The instrument profile of VEGABAR 51 corresponds
to profile specification version 3.0.
The backlight of the indicating and adjustment module is powered by
the sensor. Prerequisite is a certain level of operating voltage.
36714-EN-091008
The data for power supply are specified in chapter "Technical data".
1)
VEGABAR 51 • Profibus PA
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.
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