Vega VEGABAR 54 Product Information - page 3
1
Application, function, configuration
Area of application
VEGABAR series 50 sensors are pressure transmitters with a
deviation in characteristics of 0.2 % or 0.1 % for process pressure
and level measurement. In their construction and level of accu-
racy they are suitable for all standard applications in gases, va-
pours and liquids. The instruments are provided with comprehen-
sive indicating and adjustment options, either on site on the
measurement loop or remote. The electronics modules are avail-
able with analogue and digital signal outputs 4 … 20 mA,
4 … 20 mA/HART, Profibus PA and Foundation Fieldbus. This
enables configuration of economical single measurements as
well as connection to DCS and PLC systems.
Special features of
VEGABAR 51
are the isolating diaphragm sys-
tem, front-flush process fittings as well as high resistance materi-
als. It is available with flange as well as hygienic fittings. This
instrument covers mainly applications with highly corrosive and
hot products as well as high pressures.
VEGABAR 52
is equipped with the dry ceramic CERTEC
®
meas-
uring cell. It is provided with small ½" process fittings and is op-
tionally available with <0.1 % deviation characteristics. Typical
applications are pressure measurements in small pipelines with
clean products.
VEGABAR 53
has a metal measuring cell with different sensor
elements. It offers a large selection of front-flush process fittings
with thread or in hygienic versions. It is particularly suitable for
viscous but also corrosive liquids, mainly in the food processing
industry.
VEGABAR 54
with the small CERTEC
®
and the standard CER-
TEC
®
measuring cell is available with front-flush process fittings
from ½" as well as various threaded and flange fittings. It is thus
suitable for applications in small pipelines to large vessels. A
suitable fitting is also available for the ball valve fitting PASVE.
An IP 68 version of VEGABAR 54 is available for extremely humid
areas.
1)
VEGABAR 52 und 54
4 … 20 mA/HART - climate compensated are
pressure transmitters for use in the paper and food processing
industries as well as in water/waste water applications under dif-
ficult conditions (cold medium and warm humid environment).
User advantages
l
Deviation in characteristics < 0.2 % or < 0.1 %
l
Up to 150-fold overload resistance
l
Product temperature up to 400 °C
l
Measuring ranges up to 600 bar
l
Fulfils DGRL (pressure device directive)
l
Functional safety according to IEC 61508-4/61511 up to SIL3
l
Exchangeable indicating and adjustment module
l
Quick setup via easy menu guidance
l
Comprehensive monitoring and diagnostics functions
Measuring principle
The process pressure or hydrostatic pressure causes via the
diaphragm a change in an electrical parameter of the measuring
cell. This change is converted into an appropriate output signal.
Since the instruments are all designed for special application
areas, different sensor elements are used for detecting the pres-
sure.
VEGABAR 51
The sensor element in VEGABAR 51 is the CERTEC
®
measuring
cell with isolating system and metallic process diaphragm. A
strain gauge element is implemented for measuring ranges over
100 bar.
VEGABAR 52, 54
The sensor element of VEGABAR 52 is the dry ceramic-capaci-
tive CERTEC
®
measuring cell. Base element and diaphragm
consist of high purity sapphire-ceramic
®
.
The CERTEC
®
measuring cell is also equipped with a temper-
ature sensor. The temperature value can be displayed via the
optional indicating and adjustment module or processed via the
signal output.
16 µm
1
2
3
Fig. 1: Configuration of the CERTEC
®
measuring cell in VEGABAR 52
1
Diaphragm
2
Soldered glass bond
3
Base element
The features of the CERTEC
®
measuring cell are:
l
Very high overload resistance
l
Good corrosion resistance
l
Very high abrasion resistance
l
No hysteresis
VEGABAR 52, 54 - climate compensated
The sensor element is an encapsulated CERTEC
®
absolute
pressure measuring cell with front-flush, abrasion-resistant ce-
ramic diaphragm. The hydrostatic pressure of the medium or
the process pressure causes a capacitance change in the meas-
uring cell via the ceramic diaphragm. This capacitance change is
converted into an electrical signal, checked against an integrated
reference pressure measurement and outputted as measured
value via the output signal.
VEGABAR 53
In VEGABAR 53, a measuring cell with piezoresistive sensor
element and internal transmission liquid is used for measuring
ranges up to 16 bar. The process diaphragm is made of stainless
steel.
For measuring ranges above 25 bar, a dry strain gauge (DMS) on
the back side of the process diaphragm is implemented.
Application, function, configuration
Process pressure/Hydrostatic – Pressure measurement
3
1)
PASVE: Trade name of Satron Instruments Oy.
29234
-EN
-081013