Page 1
Operating Instructions
VEGABAR 25
87654321
+ -
-
DISPLAY
4 ¼ 20 mA
+
VEGADIS 10
12 ¼ 36 V DC E12
Level and Pressure
0 - 20 bar
p
Page 2
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 25
Note Ex-area
Please note the approval documents attached
(yellow binder), and especially the safety data
sheet included.
Page 3
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 ............................................................................. 8
1.5 Dimensions ........................................................................... 9
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 25 3
Page 4
1 Product description
Product description
1.1 Function and configuration
The VEGABAR 25 process pressure transmitters are efficient instruments for process
pressure measurement. The dry CERTEC
metal-capacitive measuring cell 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 integral 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 the 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.
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 25
Page 5
Product description
1.3 Technical data
Mechanical data
Materials, wetted parts
Process connection stainless steel 1.4571
Diaphragm Duratherm 600 (highly corrosion-resistant stain
Materials, non-wetted parts
Housing high resistance plastic PBT (Polyester)
Earth terminal stainless steel 1.4305
Indicating module window glass
Weight
VEGABAR approx. 0,5 … 8 kg (dependent on process
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
less steel)
connection)
- bar graph (20 segments)
- digital value (4-digit)
- 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 25 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 25 5
2,5 mm
IP 65
2
Page 6
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 supply voltage
(see load diagram)
1000
750
in Ohm
500
total
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
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 25
Page 7
Product description
Measuring ranges
Nominal range Gauge pressure Low pressure
resistance
1)
resistance
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
-0,5 … +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
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
Deviation in characteristics limit point adjustment acc. to DIN 16 086
Characteristics linear
Deviation of characteristics
- accuracy class 0,25 < 0,25 %
- accuracy class 0,1 < 0,1 %
Hysteresis
Repeatability
2)
2)
2)
< 0,05 %
< 0,05 %
Influence of the ambient temperature
Average temperature coefficient
of the zero signal
2) 3)
- accuracy class 0,25 < 0,15 %/10 K
- accuracy class 0,1 < 0,05 %/10 K
1)
Note nominal pressure stage of the process connection!
2)
Relating to the nominal pressure.
3)
In compensated temperature range of 0°C … 80°C, reference temperature 20°C.
VEGABAR 25 7
Page 8
Product description
Long-term stability
Long-term drift of the zero signal
1) 2)
< 0,25 %
Other actuating variables
Calibration position standing, diaphragm pointing downwards
Influence of the installation position < 5 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 condition gas, steam, liquid up to high viscosity
also abrasive and aggressive with suitable
material selection of wetted parts
acc. to order code
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
1.4 Approvals
StEx Zone 10
Ship approval
CENELEC EEx ia IIC
A TEX II 1G EEx ia IIC and WHG
A TEX II 1G EEX ia IIC and ship approval
DVGW (applied)
If the use of approved instruments is required for certain applications, the appropriate legal
documents (test reports, test certificates and conformity certificates) must be observed.
These are supplied with the appropriate instrument.
1)
Relating to the nominal range.
2)
Acc. to IEC 770, item 6.1.2 relating to the nominal range.
8 VEGABAR 25
Page 9
Product description
1.5 Dimensions
Housing
Flat seal
without indicating module with indicating module
85
~76
18
60
SW 60
3
58
25
G 11/2 A
ø55
GG GN
Option:
Test adapter for connection to
a pressure calibrator
Earth connection
58
25
28
Pg 13,5
SW 60
52
11/2" NPT
Options:
21
M44 x 1,25
BA / BB
ø60
SW 46
Pressure screw
M44 x 1,25
O-ring seal
PTFE-flat seal
Welded socket
Welding dummy and
blind stopper
Option:
Test adapter for connection to a pressure
calibrator
Process connection:
Thread
Order Version Seal
code (PTFE in production program with exceptions)
GG G 11/2 A, stst 1.4571, PN 40 Flat seal 48 x 55 x 2, Klinger C-4400
GN Thread 11/2"-NPT, 1.4571, PN 40 ––
BA / BB M44 x 1,25 with pressure screw O-ring seal 40 x 2, Viton
Alu 3.1645, PN 25 / stst 1.4571, PN 40 Flat seal 36,5 x 40,7 x 0,8 PTFE
VEGABAR 25 9
(axial additional seal)
Page 10
Process connections
Compression
nut acc. to
DIN 11 851
Product description
58
d5
d10
RA / RB
d1
c
d12
Welded socket acc.
to DIN 11 851
58
Flat seal
18
3
Seal ring acc. to
DIN 11 8 51
ø65,8
ø84
ø105
AA
ø125
Mounting boss
58
Rd 65 x 1/6
40
Welded socket
4xM10
ø78
LA
ø80
Clamp-seal
O-ring seal
58
21,5
Clampmounting boss
ø64
CA
ø47,8
ø50,8
58
O-ring
seal
40
ø72
ø90
LB
ø90
ø80
Mounting boss
Seal
20
58
ø64
ø84
O-ring
seal
6xM6
58
ø48
ø100
PA
ø82
ø165
TA
4xM8
Bolting acc. to DIN 11 851
Order Nominal size Welded socket Thread acc. to Compression Seal ring
code cd1d12DIN 405, part 1 d5nut d
RA DN 40 PN 25 3 3 38 43 Rd 65 x 1/
RB DN 50 PN 25 3 5 50 55 Rd 78 x 1/
6
6
78 DN 40 NBR
92 DN 50 NBR
DIN 11 851
10
Further connections
Order code Version Seal (in production program)
LA hygienic connection with compression nut F40, PN 25 O-ring seal 40 x 5 EPDM
LB hygienic connection with tension flange DN 32, PN 25 O-ring seal 40 x 5 EPDM
PA APV connection flange, PN 25
TA Tuchenhagen Varivent, PN 10 O-ring seal 60 x 3 EPDM
AA DRD, PN 40 Flat seal 50 x 66 x 1 PTFE
CA TRI-Clamp 2", PN 10 Clamp seal 2" EPDM
10 VEGABAR 25
Page 11
Mounting, electrical connection
2 Mounting
VEGABAR can be mounted in any position.
Cable entries must point downwards to avoid
humidity ingress. For this purpose the housing can be rotated by 330° in relation to the
mounting part.
A seal, appropriate for the connection, must
be used for mounting. This seal is either
supplied with VEGABAR or must be provided
by the customer.
Compensation of the atmospheric
pressure
The atmospheric pressure of instruments
used for overpressure measurements is
compensated via a breather facility integrated in the housing.
3 Electrical connection
3.1 Connection information
The electronics in VEGABAR 25 require a
power supply of 12 … 36 V DC. It is provided in two-wire technology, i.e. supply
voltage and current signal are led to the
terminals via the same two-wire connection
cable.
This external energy is provided via a separate power supply unit:
- power supply unit, e.g. VEGASTAB 690
- processing unit with integral DC-current
source (e.g. active PLC-input)
- VEGAMET or VEGADIS 371
Note that the external energy source is reliably separated from the mains circuits acc.
to DIN VDE 0106, part 101. The above-mentioned VEGA-instruments meet this requirement, and protection class III is therefore
ensured.
The external energy source must supply a
terminal voltage of at least 12 V to the transmitter. The actual terminal voltage on the
transmitter depends on the following factors:
- output voltage of the external energy
source under nominal load,
- electrical resistors of the connected instruments in the circuit (see connected instruments, load resistor).
Note the following instructions for electrical
connection:
- Connection must be made acc. to the specific installation standards (e.g. in Germany
according to the VDE-regulations).
- Terminal voltage must not exceed 36 V to
avoid damage to the electronics.
- Electrical connection is provided with reverse polarity protection.
- The wiring between VEGABAR and the
power supply can be carried out using
standard two-wire cable.
VEGABAR 25 11
Page 12
Electrical connection
- Screened cable is recommended if strong
electromagnetic interference is expected.
The screening must be earthed at the
sensor end.
- If overvoltages are expected, we recommend the installation of VEGA-overvoltage
arresters.
- In the PG a seal must be used which fits to
the cable.
3.2 Connection plan
Note:
A current meter for local control of the output current can be connected to terminals 1 and 3.
This measurement can be made during operation without interrupting the supply cable.
VEGABAR
VEGABAR (with or without indication)
Current meter for local
control
1)
Earth
1
8 76532
rd wt vio or
–+
Supply voltage
12 … 36 V DC
4 … 20 mA
1)
If screened cable is used, the screen must be connected to earth in the terminal box on one side and the
0 - 20 bar
earth terminal must be earthed outside on the housing according to regulations. The terminals are connected
each other in the housing.
12 VEGABAR 25
Page 13
Electrical connection
3.3 Connection examples
Supply via power supply unit
Processing is carried out using an indicating instrument.
Current meter for local
control
+ ––
1 2 3
VEGABAR
terminals
Supply via a signal conditioning instrument
Standard circuit for basic module with analogue output (not
standardised).
Current meter for local
control
+––
1 2 3
VEGABAR terminals
analogue / digital indicating instrument
Power supply unit
–
~
+
Signal conditioning
instrument
0/4…20 mA
DISBUS
!
Supply via a PLC with active input circuit
Processing is carried out via a PLC with active input circuit.
Current meter for local
control
+––
1 2 3
VEGABAR 25 13
VEGABAR terminals
PLC
–
PLC
+
Page 14
4 Set-up
Set-up
Electrical connection and set-up can be simplified by temporarily mounting the cover or
indicating module on VEGABAR or laterally
displaced downwards.
VEGABAR
+ 4¼ 20 mA
12¼ 36 V DC E12
0 - 20 bar
OK
87654321
-
DISPLAY
+
VEGADIS 10
Loosely tighten screws
Indicating module
4.1 Adjustment of the basic
functions
Adjustment elements
Rotating switch: Choose
required function
Key +: Change
OPERATE
t
i
ZERO
SPAN
Adjustment system
• Select the required function with the rotat-
ing switch.
• Change the value with keys “+“- and “–“.
• Reset rotating switch to OPERATE, the
adjusted values are transferred to the
EEPROM-memory. They remain there even
on voltage loss.
value (raising)
Key –: Change
value (falling)
Adjustment
For adjustment of zero and span, a current
meter must be connected to terminals 1 and
3. The measured value is identical with the
output current.
1 Adjustment of zero
(e.g. process pressure zero or empty
vessel)
• Set rotating switch to zero
• By pushing the “+“ and “–“-keys simultane-
ously, the current jumps directly to 4 mA or
set it to 4 mA by pushing the “+“ and “–“-
keys
Adjustment range of zero:
-20 % … +95 % of the nominal measuring
range (corresponds to turn up of up to
+95 %)
2 Adjustment of span
(e.g. process pressure or vessel level
maximum)
• Set rotating switch to span
• By pushing the “+“ and “–“-keys simultane-
ously, the current jumps directly to 20 mA
or set it to 20 mA by pushing the “+“ and “–
“-keys
Adjustment range of span:
3,3 % … 120 % of the nominal measuring
range (corresponds to turn down 1 : 30)
Note:
- A modification of zero does not influence
the span.
- It is also possible to adjust currents for
partial fillings or partial pressures, e.g.
8 mA for 25 % and 16 mA for 75 %. VEGABAR automatically calculates the current
values for 0 % or 100 % (only possible with
³ 3,3 %).
14 VEGABAR 25
Page 15
Set-up
Integration time
An integration time ti of 0 … 10 s can be adjusted for damping pressure shocks.
Procedure
• Set rotating switch to t
• By pushing the “-“-key 10-times, ensure
i
first of all that the integration time is set to
0 s
• Push the “+“-key once for every 1 s inte-
gration time required
The integration time is the time required by
the current output signal to reach 90 % of the
actual level after a step change of the process pressure.
4.2 Menu-guided adjustment with
additional functions
The adjustment with the multiple function
module is menu orientated and is made via
the four keys in conjunction with the text
display. The move from the measured value
indication to the main menu is made with the
“OK“-key. Use the “® “-key to change from
one menu point to an other within the menu.
Branches
A branching is shown by the ▼ symbol and
enables a jump to the menu below with the
“OK“-key. In this menu you can find param-
eters which are linked (possibly in other
submenus).
Parameters have no ▲ or ▼symbol. The
value of the parameters can be modified with
the “+“ and “–“-keys or chosen from the list.
When these buttons are pushed once, the
value flashes first. When pushed again, the
value is modified. The modified value can be
saved with the “OK“-key. Push the “®“-key to
interrupt input (without storing the modification).
Certain parameters can only be indicated
and their values cannot be modified.
Reset
A reset is shown by the ▲ symbol and ena-
bles a jump to the menu above with the “OK“-
key.
Automatic reset to measured value indication
is triggered 60 minutes after having last
pushed a key.
Adjustment elements
Indication of:
- measured value
- functions in menu
Jump to the menu below
with OK-key
D Reset to the menu above
with OK-key
VEGABAR 25 15
Dependent on the parameter, change value (raising)
or choose from list
+
OPERATE
3.00
mbar
Dependent on the parameter, change value (lowering) or choose from list
fi
–
Choose menu point or interrupt input
OK
Acc. to the menu point, save the
adjusted value or change the menu
level
Page 16
Menu plan
Set-up
Operate
0,2
mbar
Ad-
just-
ment
Adjust
with
press.
Measured value
indication
Calcu-
lation
ti
1
s
Adust
without
press
Unit
0,0
mbar
psi
kPa
Unit
0,0
mbar
psi
kPa
%
Scal.
mA
Escape
Offset
correc-
tion
Offset
corr.
OK?
Sensor
unpres-
surized?
Output
Current
output
4-20mA
20-4mA
Scaling
indica-
tion
0%=
0
Zero
0,0
mbar
Fault
signal
22mA
3,6mA
Escape
100%=
1000
Span
100,0
mbar
Escape
Decimal
point
888,8
Escape
Escape
Simula-
tion
Sim.
xx,x
mbar
Zero
4,000
mA
16 VEGABAR 25
Span
4,000
mA
Escape
Page 17
Set-up
Addi-
tional
functiion
Sensor
data
Escape
Lan-
guage
Lan-
guage
English
Reset
Reset
OK ?
Escape
Deutsch
Franc.
Ital.
Español
Herst.
Date
49.98
1)
By pushing the “+“ and “–“-keys together, the min.
1)
P min
-0,3
mbar
Reset
Now!
OK ?
P max
150
mbar
1) 1) 1)
Temp.
30,7
°C
and max. values can be reset to the actual value.
Use the arrow key, to move
to the right in the menu plan.
T min
23,5
°C
T max
36,2
°C
Diagno-
stic no.
- - -
Escape
Adjust
with
press.
Escape
Scaling
indica-
tion
In menu points with these
symbols you can move to the
bottom or top with the “OK“-key.
Light grey menu points are only
displayed if necessary (dependent
on the instrument version).
Span
100,0
mbar
Lan-
guage
English
Deutsch
Franc.
Ital.
Español
In white letters you see the parameters
which can be modified with the “+“ or
“–“-key and saved with the “OK“-key.
Sensor and measured value information which cannot be modified in these
positions are in itallics.
List
These options can be chosen with the
“+“ or “–“-key and saved with the
“OK“-key.
VEGABAR 25 17
Page 18
Set-up
Adjustment taking the current pressure into account (live adjustment)
Live adjustment comprises two steps:
1 Adjustment of zero
2 Adjustment of span
The appropriate output current is displayed
via the DOT-matrix.
1 Adjustment of zero
(e.g. process pressure zero or vessel
empty)
Set the current value to 4,000 mA
Zero
4,000
with the “+“ or “–“-key. Then push
mA
the “OK“-key.
2 Adjustment of span
(e.g. process pressure or vessel level max.)
Set the current value to 20,000 mA
Span
20,000
with the “+“ or “–“-key. Then push
mA
the “OK“-key.
Note:
- A modification of zero does not influence
the adjusted span.
- “+“ and “–“ are pushed simultaneously for
standard adjustment of zero/span. The
value jumps directly to 4 mA/20 mA.
- In the case of a high turn down the “+“ and
“-“-key should generally be pressed simul-
taneously due to the resolution.
- When pushing the “+“ or “–“-keys individu-
ally, the output current remains at the last
value, it takes on the adjusted value only
after storing with the “OK“-key.
- It is also possible to adjust currents for
partial fillings or partial pressures, e.g.
8 mA for 25 % and 16 mA for 75 %. Then
VEGABAR automatically calculates the
current values for 0 % or 100 % (only possible with >3,3 %).
Adjustment without taking the current
pressure into account (dry adjustment)
Adjustment without pressure comprises four
steps:
1 Selection of the unit in which the adjustment
is to be carried out
2 Offset correction
3 Adjustment of zero
4 Adjustment of span
The offset correction (only with overpressure)
defines the reference basis for the measurement. It can be carried out:
- before or after the adjustment of zero and
span
- before or after installation of VEGABAR.
VEGABAR must be unpressurised when the
offset correction is carried out!
Adjustment without pressure can be carried
out assembled or unassembled (e.g. workroom). A currently existing pressure has no
significance for the adjustment.
1 Enquiry of the unit
Choose the unit with the “+“ or “–“.
Adjust
without
2 Adjustment of zero
mbar
4 Adjustment of span
Span
100,0
mbar
Save the selected unit with the
press.
“OK“-key.
Unit
0,0
mbar
psi
kPa
Adjust zero with the “+“ or “–“-key
Zero
0,0
and save with the “OK“-key.
Adjust span with the “+“ or “–“-key
and save with the “OK“-key.
18 VEGABAR 25
Page 19
Set-up
Note:
- A modification of zero does not influence
the adjusted span.
- By pushing the “+“ and “–“-keys the output
current remains on the last value, after
saving with the “OK“-key, the output cur-
rent takes on the adjusted value.
Evaluation
Adjustment of the integration time
ti
An integration time ti of 0 s … 10 s
1
can be adjusted with the “+“ or “–“-
s
adjusted value can be saved with the “OK“-
key.
Selection of the unit
Scaling
key to damp pressure shocks. The
The actual measured pressure is
Unit
0,0
displayed on the DOT-matrix in the
mbar
measured value indication. The
psi
appropriate unit can be chosen
kPa
from a list with the “+“ or “–“-key
%
and the “OK“-key. When choosing
scal.
the unit “Scal.“ the following menu
mA
points are available.
Bar graph and digital value relate to the adjusted measuring range and change proportionally to the current output. Digital values
< –10 % or > 110 % are displayed as flashing figures.
As a result of scaling, the 4 mA or 20 mA
user-specific current output values are assigned to the indicating module as 4-figure
digital values.
Outputs
Current output/Selection of the characteristics
The current output provides the actual measured pressure as an analogue current signal
4 … 20 mA depending on the adjustment.
The characteristics can also be
Current
output
inverted, i.e. adjusted to 20 ... 4 mA
4-20mA
with the “+“ or “–“-key and the
20-4mA
“OK“-key.
Fault signal
The fault signal is triggered via the current
output if during continuous self-monitoring,
failures, damage or interference in the measuring cell or the electronics are detected, .
In operating condition the actual measured
pressure is displayed on the indicating module:
- as a bar graph with 20 segments
3,6mA
You choose whether the failure
Fautl
signal
current should be 22 mA or 3,6 mA
22mA
with the “+“ or “–“-key and the
“OK“-key .
- as a 4-digit digital value.
Scaling
indica-
tion
0%=
0
100%=
1000
Decimal
point
888,8
Escape
Simulation
You can adjust with the “+“ or “–“-
Simula-
tion
key an individual pressure or %value to check the outputs of VEGABAR and connected components.
Sim.
The adjusted value flashes with
xx,x
activated simulation. The simulation
mbar
can be finished with the “OK“-key.
VEGABAR 25 19
Page 20
Set-up
Additional functions
Sensor data
Important sensor data can be indicated via
the DOT-matrix for information and diagnosis
purposes:
- manufacturing date
- pointer function (p
- pointer function (p
- actual temperature value (Temp)
- pointer function (T
- pointer function (T
- diagnosis number
Addi-
tional
function
Sensor
data
Prod.
P min
Date
49.98
1)
The min. and max.-values can be set to the actual
value by pushing the “+“ and “–“-keys simultane-
ously.
P max
-0,3
mbar
1)
1) 1) 1)
150
mbar
min
max
min
max
Temp.
)
)
)
)
30,7
°C
T min
23,5
°C
T max
36,2
°C
Diagno-
stic no.
- - -
Reset
The reset function deletes the ad-
Reset
justed values and resets the parameters to the default values. The
adjustment data again correspond
Reset
to the nominal measuring range.
OK ?
Reset
Now!
OK ?
4.3 Indicating module
Digital value
- 4 digits and decimal point
- with single range and basic function module fixed indication range in bar
- the multiple function module can be individually scaled.
Connection is made acc. to the scheme in the
“Electrical connection“ section.
Tendency
indication
Language
Lan-
guage
VEGABAR is adjusted to the order
language as default. The languages German, English, Italian or
Bargraph
Digital value
Spanish can be chosen with the
“+“ or “–“-key and the “OK“-key.
Lan-
guage
English
Deutsch
Franc.
Ital.
Español
20 VEGABAR 25
Page 21
Diagnosis
5 Diagnosis
5.1 Maintenance
VEGABAR process pressure transmitters are
maintenance free.
5.2 Failure removal
Fault signals
VEGABAR provides high reliability with its
self-test and continuous self-monitoring. If
however malfunctions occur, VEGABAR diagnosis distinguishes between atypical process conditions and faults in the VEGABAR.
Atypical process conditions
Exceeding or not reaching the measuring
range limits (fault signal extinguishes when
the value is again in the measuring range).
Failure in VEGABAR
Failure in the electronics, interferences or
damages in the measuring cell.
The following table assists in analysing the
fault signals.
Reason Fault signal via
Clearly “OPERATE Bargraph 0 %
outside ???? or 100 % Current
measuring bar“, Digital value value
range no adjust- flashes, tendency 3,6 mA
Overload Bargraph 0 %
range or 100 %,
of the for digital value
measuring four segments
cell flash
Failure in “Defect “, all segments
VEGABAR no adjust- flash
DOT-matrix Bar graph Current
indication or
possible active >21,6 mA
ment
possible, no
measuring
function
Digital indication output
On instruments with menu-guided adjustment
with additional functions, possible reasons
are displayed under the menu point “Diagnosis no.“ in case of failure.
Diagnosis no. Meaning
1 No frequency from C/f-converter
2 Frequency signal of the capacitor
outside the limit values
3 Frequency signal of the reference
capacitor outside the limit values
4 Frequency signal temperature outside
the limit values
7 Communication erro to EEPROM
9 Error in EEPROM CRC-checksum
Troubleshooting
If the indicated value does not correspond to
the level in the vessel or to the process pressure, the following measures must be carried
out:
- check the pressure compensation (only
with overpressure measuring ranges)
- check the electrical connection.
Checking pressure compensation
Open the housing of VEGABAR. The measured value should not change. However if the
indicated value changes, compensation of
the atmospheric pressure is not ensured and
the measured value will be affected. Check
the breather facility on the VEGABAR-housing.
VEGABAR 25 21
Page 22
Checking the electrical components
Diagnosis
–+
1 2 3
mA
–
Voltage
V
Current meter for
local control
Current
mA
External
energy source
–
~
+
Voltage
- the terminal voltage on VEGABAR must be
at least 12 V DC
Current
Current value Condition
3,8 … 20,6 mA standard range for output current
0 mA signal line open circuit
< 3,6 mA oscillator or pressure sensor ele-
> 21,6 mA short-circuit in the signal line,
ment defect
oscillator or pressure sensor element defective
22 VEGABAR 25
Page 23
Instrument modification
6 Instrument modification
6.1 Interchanging adjustment
modules
Indication
with LCdisplay
Module for
basic
functions
Module for
menu-guided
adjustment
VEGABAR
The modular construction of VEGABAR allows
retrofitting, interchange or removal of adjustment modules and the indicating module.
Retrofitting may be necessary e.g. when a
VEGABAR with factory settings should be
adapted to modified measurement conditions. Data already saved (e.g. adjustment
values) are not saved in the adjustment module but in an EEPROM of the oscillator and readjustment is therefore not necessary.
Module
without
adjustment
Exchange of the adjustment module
Removal of the adjustment module
1 Separate VEGABAR from the power
supply
2 Loosen the screws on the cover of
VEGABAR or VEGADIS 10
3 Loosen connection cable from the termi-
nals
4 Loosen screws of the adjustment cover
5 Remove adjustment cover and plug con-
nection
Insertion of an adjustment module
6 Plug the connection of the new adjust-
ment cover to the plug-in socket of the
oscillator
7 Fasten new adjustment cover
8 Fasten connection cables to terminals
9 Close cover of VEGABAR or VEGADIS 10
10 Connect VEGABAR to power supply
Retrofitting of an indicating module
1 Separate VEGABAR from power supply
2 Loosen screws on cover of VEGABAR or
VEGADIS 10
3 Remove cover
4 Connect indicating module to the screw
terminals via the four lines (note “3.3
Connection plan“)
Note:
Step 4 is facilitated when the indicating module is temporarily (carefully) mounted with two
screws.
5 Place indicating module in the correct
position on VEGABAR or VEGADIS 10
6 Tighten screws of the cover
7 Connect VEGABAR to power supply
The connection of the modules is made:
- on the adjustment module via a 4-pole plug
connection
- on the indicating module via screw terminals.
VEGABAR 25 23
Page 24
VEGA Grieshaber KG
Am Hohenstein 113
D-77761 Schiltach
Phone (0 78 36) 50 - 0
Fax (0 78 36) 50 - 201
e-mail info@vega-g.de
ISO 9001
The statements on types, application, use and operating conditions
of the sensors and processing systems correspond to the actual
knowledge at the date of printing.
Technical data subject to alteration.
2.23 431 / July ’99
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