VEGA BAR20 User Manual
Operating instructions
VEGABAR 20
87654321
+ -
-
DISPLAY
4 ¼ 20 mA
+
VEGADIS 10
12 ¼ 36 V DC E12
Level and Pressure
0 - 20 bar
p
Safety information
Safety information
The described module must only be installed
and operated as described in these operating
instructions. Please note that other action can
cause damage for which VEGA does not take
responsibility.
2 VEGABAR 20
Note Ex-area
Please note the approval documents attached
(yellow binder), and especially the safety data
sheet included .
Contents
Contents
Safety information ........................................................................ 2
Note Ex-area ................................................................................ 2
1 Product description
1.1 Function and configuration .................................................. 4
1.2 Self-monitoring ..................................................................... 4
1.3 Technical data....................................................................... 5
1.4 Approvals ............................................................................. 9
1.5 Dimensions ......................................................................... 10
2 Mounting................................................................................... 11
3 Electrical connection
3.1 Connection information ...................................................... 11
3.2 Connection plan ................................................................. 12
3.3 Connection examples ........................................................ 13
4 Set-up
4.1 Adjustment of the basic functions .................................... 14
4.2 Menu-guided adjustment with additional functions ......... 15
4.3 Indicating module ............................................................... 20
5 Diagnosis
5.1 Maintenance ....................................................................... 21
5.2 Failure removal ................................................................... 21
6 Instrument modification
6.1 Interchanging adjustment modules .................................. 23
VEGABAR 20 3
1 Product description
Product description
1.1 Function and configuration
The VEGABAR 20 process pressure transmitters are efficient instruments for process
pressure measurement. The dry ceramiccapacitive measuring cell CERTEC® is used
as a pressure sensor element. The process
pressure causes a capacitance change
within the measuring cell via the diaphragm.
This capacitance change is detected by an
ASIC (application specific integrated circuit)
and converted into a pressure proportional
signal by an integrated oscillator with microcomputer. Precise digital processing of
measured data with highest resolution ensures excellent technical data.
The oscillator is powered by a separate
VEGA-signal conditioning instrument, a stabilised power supply unit or a PLC (active
input). After adjustment, a standardised
current signal of 4 … 20 mA is available
which can be displayed (e.g. in PLC-systems) or further processed.
Four versions are available for adjustment:
- adjustment module directly on VEGABAR
- adjustment module in external housing
(VEGADIS 10)
- via PC with adjustment software (see
manual "VEGA Visual Operating (VVO)“)
- in the control room on the signal conditioning instrument
1.2 Self-monitoring
Important electronic components are
checked for their function, while internal parameters, such as sensor value, temperature
and operating voltage, are monitored to increase reliability.
VEGABAR 20 with the ceramic CERTEC®measuring cell offers the advantage of continuous self-monitoring. The measuring and
reference capacitances of the measuring cell
are in a defined ratio over the complete
measuring range. Any deviation from these
data is a reliable indicator for a malfunction of
the measuring cell.
If failures or malfunctions are detected during
these routines, a fault signal is triggered via
the 4 … 20 mA-output (current jump to
3,6 mA or 22 mA).
4 VEGABAR 20
Product description
1.3 Technical data
Mechanical data
Materials, wetted parts
Process connection brass 2.040, stainless steel 1.4571
Diaphragm ceramic (99,5 % Oxydeceramic)
Measuring cell seal Viton, Kalrez
Materials, non-wetted parts
Housing high resistance plastic PBT (Polyester)
Earth terminal stainless steel 1.4305
Indicating module window glass
Weight
VEGABAR approx. 0,8 kg
Adjustment and indicating elements
Adjustment of the basic functions 2 keys, 1 rotating switch
Menu-guided adjustment with
additional function
- adjustment elements 4 keys
- indicating elements DOT-matrix display, 3 lines with 7 figures each
Indicating module LC-display with
- bargraph (20 segments)
- digital value (4-digits)
- tendency indicators for raising or lowering
values
Electrical data
Connection
Cable entry Pg 13,5 (for cable-ø 5 … 10 mm)
Screw terminals for conductor cross-sections of up to
Protective measures
Protection
1)
Protection class III
Overvoltage category III
CE-conformity
VEGABAR 20 corresponds to the requirements of EMC (89/336/EWG) and NSR
(73/23/EWG). The conformity has been judged acc. to the following standards:
EMC Emission EN 50 081 - 1: 1992
Susceptibility EN 50 082 - 2: 1995
NSR EN 61 010 - 1: 1993
1)
Use of a suitable seal for the cable in the PG is necessary for maintaining the housing protection. If the seal
used does not fit the cable, it should be replaced by a suitable one.
VEGABAR 20 5
2,5 mm
IP 65
2
NAMUR-regulations
The NAMUR-regulations NE 21, May 1993 are met.
Supply and signal circuit
Supply voltage 12 … 36 V DC
Permissible residual ripple USS - 1 V
Output signal
- range 3,8 … 20,5 mA
- resolution 6 µA
Current limitation approx. 22 mA
Fault signal 22 mA (3,6 mA)
Integration time 0 … 10 s adjustable
Average delay time 150 ms
Connection cable 2-wire
Max. permissible load dependent on the supply voltage
(see load diagram)
1000
750
in Ohm
total
500
250
Load RL
0
12
18 24 30 36
Voltage of the external energy UH in Volts
Product description
Indicating and adjustment circuit
For connection to VEGADIS 10 and/or the indicating module
Data transmission digital
Connection cable 4-wire (standard cable)
Cable length max. 25 m
Transmission reaction
Measuring ranges
Min. pressure 10 mbar
Zero -20 % … +95 % adjustable of nominal range
Span 3,3 % … 120 % adjustable of nominal range
Turn up up to +95 %
Turn down up to 1 : 30
Recommended turn down:
Accuracy class 0,25 up to 1 : 5
Accuracy class 0,1 up to 1 : 10
6 VEGABAR 20
abs
Product description
Measuring range
Nominal measuring Gauge pressure Low pressure
range resistance
1)
resistance
Gauge pressure
0 … 0,1 bar 10 bar -0,1 bar
0 … 0,2 bar 15 bar -0,2 bar
0 … 0,4 bar 20 bar -0,4 bar
0 … 1,0 bar 25 bar -1,0 bar
0 … 2,5 bar 35 bar -1,0 bar
0 … 5,0 bar 45 bar -1,0 bar
0 … 10,0 bar 60 bar -1,0 bar
0 … 20,0 bar 90 bar -1,0 bar
0 … 40,0 bar 140 bar -1,0 bar
0 … 60,0 bar 200 bar -1,0 bar
-0,05 … 0,05 bar 10 bar -0,1 bar
-0,1 … +0,1 bar 15 bar -0,2 bar
-0,2 … +0,2 bar 20 bar -0,4 bar
-0,5 … +0,5 bar 25 bar -1,0 bar
-1,0 … +0,0 bar 25 bar -1,0 bar
-1,0 … +1,5 bar 35 bar -1,0 bar
-1,0 … +4,0 bar 45 bar -1,0 bar
-1,0 … +10,0 bar 60 bar -1,0 bar
-1,0 … +20,0 bar 90 bar -1,0 bar
-1,0 … +40,0 bar 140 bar -1,0 bar
-1,0 … +60,0 bar 200 bar -1,0 bar
Absolute pressure
0 … 1,0 bar 25 bar
0 … 2,5 bar 35 bar
0 … 5,0 bar 45 bar
0 … 10,0 bar 60 bar
0 … 20,0 bar 90 bar
0 … 40,0 bar 140 bar
0 … 60,0 bar 200 bar
1)
Note nominal pressure stage of the process connection!
VEGABAR 20 7
Product description
Measuring accuracy (similar to DIN 16 086, DIN V 19 259 - 1 and IEC 770)
Deviation
Reference conditions (acc. to IEC 770)
- temperature 18°C … 30°C rel. humidity
- air pressure 860 kPa … 1060 kPa
Determination of characteristics limit point adjustment acc. to DIN 16 086
Characteristics linear
Deviation in characteristics
- accuracy class 0,25 < 0,25 %
- accuracy class 0,1 < 0,1 %
Hysteresis
Repeatability
1)
1)
Influence of the ambient temperature
Average temperature coefficient
of the zero signal
1) 2)
- accuracy class 0,25 < 0,15 %/10 K
- accuracy class 0,1 < 0,05 %/10 K
1)
< 0,02 %
< 0,02 %
Long-term stability
Long-term drift of the zero signal
1) 3)
< 0,1 %
Other actuating variables
Calibration position standing, diaphragm points downwards
Influence of the installation position < 0,2 mbar
Vibration resistance mechanical vibrations with 4 g and
5 … 100 Hz, tested acc. to the regulations of
German Lloyd GL-characteristics 2
Operating conditions
Product
Aggregate conditions gas, steam, liquid up to high viscosity
Ambient conditions
Ambient temperature -40°C … +85°C
- indicating module -20°C … +70°C
Storage and transport temperature -40°C … +85°C
Product temperature -40°C … +100°C
also abrasive and aggressive with suitable
material selection of wetted parts
acc. to order code
1)
Relating to the nominal measuring range.
2)
In the compensated temperature range of 0°C … +80°C, reference temperature 20°C.
3)
Acc. to IEC 770, point 6.1.2 relating to the nominal measuring range.
8 VEGABAR 20
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