VEGA BAR24 User Manual

Operating Instructions

VEGABAR 24

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 24

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 ........................................................................... 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

6.2 Exchange of the hygienic form seal on VEGABAR 24 .... 24

VEGABAR 24 3

1 Product description

Product description

1.1 Function and configuration

The VEGABAR 24 process pressure trans­mitters are efficient instruments for process
pressure measurement. The dry CERTEC
ceramic-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 adjustment, a standardised
current signal of 4 … 20 mA is available
which can be displayed (e.g. in PLC-sys­tems) or further processed.

For 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 24

Product description

1.3 Technical data

Mechanical data

Materials, wetted parts

Process connection stainless steel 1.4571, PVDF

1)

Diaphragm ceramic (99,5 % Oxydeceramic)
Seal measuring cell Viton, Kalrez, EPDM

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 … 8 kg (dependent on process

connection)

Adjustment and indicating elements

Adjustment of the basic functions 2 keys, 1 rotating switch
Menu-guided adjustment with
additional function

- adjustment elements 4 key

- indicating elements DOT-matrix display, 3 lines with 7 figures each
Indicating module LC-display with

- 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

2,5 mm

2

Protective measures

Protection

1)

IP 65
Protection class III
Overvoltage category III

CE-conformity

VEGABAR 24 meets 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 24 5

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

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

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 24

abs

Product description

Measuring ranges

Nominal range Gauge pressure Low pressure

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

-0,05 … 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
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 24 7

Product description

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 24

Product description

1.4 Approvals

Ex Zone 2
StEx Zone 10
Ship approval
CENELEC EEx ia IIC
ATEX II 1G EEx ia IIC and WHG
ATEX 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.

1.5 Dimensions

Housing

without indicating module with indicating module

85

~76

72

Pg 13,5

Earth connection

82

Breather facility

VEGABAR 24 9

Process connections

ø 49,6

ø 49,6

ø 49,6

Product description

ø 49,6

SW 60

49

24,5

G 1½ A

ø 55

GG

ø 49,6

SW 46

39

82

ø 78

LA

ø 49,6

SW 46

64

ø 78

RA

ø 64

ø 49,6

SW 60

49,5

25

G 1½ A

ø 60

GW

ø 49,6

SW 46

34,5

82

ø 90

LB

ø 49,6

SW 46

64

ø 92

RB

49

SW 60

64

64

25

SW 46

SW 46

1½ " NPT

GN

ø 49,6

ø 64

CA

ø 49,6

ø 65,8
ø 105

AA

51,5

SW 46

21

M44 x 1,25

BA/BB

ø 49,6

SW 46

64

ø 84

TA

ø 49,6

SW 46

64

ø 100

PA

20,5

51,5

ø 100
ø 165

FW

10 VEGABAR 24

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 24 require a
power supply of 12 … 36 V DC. It is pro-
vided 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 24 11

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 24

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

TVEGABAR 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 24 13

TVEGABAR terminals

PLC

–

PLC

+

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 func-

tions

Adjustment elements

Rotating switch: Choose
required function

Key +: Change

OPERATE
t

i

ZERO
SPAN

Adjustment system

• Select the required function with the rotat­ing 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 24

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 inte­gration 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 param­eters 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 ena­bles 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 24 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

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 24

Span

4,000

mA

Escape

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 simultaneously,

P min

1)

-0,3

mbar

Reset

Now!

OK ?

P max

150

mbar

1) 1) 1)

Temp.

30,7

°C

the min. 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 24 17

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 simul­taneously due to the resolution.

- When pushing the “+“ or “–“-keys individu­ally, 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

Adjust

without

2 Adjustment of zero

mbar

4 Adjustment of span

Span

100,0

mbar

Choose the unit with the “+“ or “–“.
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 24

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 cur­rent 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

Unit

The actual measured pressure is

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

%
scal.

and the “OK“-key. When choosing

mA

the unit “Scal.“ the following menu
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

You choose whether the failure

Fautl

signal

current should be 22 mA or 3,6 mA

22mA

with the “+“ or “–“-key and the

3,6mA

“OK“-key .

- as a 4-digit digital value.

Scaling

indica-

tion

0%=

0

100%=

1000

Decimal

point

888,8

Escape

Simulation

Simula-

You can adjust with the “+“ or “–“-

tion

key an individual pressure or %­value to check the outputs of VEGA­BAR and connected components.

Sim.

The adjusted value flashes with

xx,x

mbar

activated simulation. The simulation
can be finished with the “OK“-key.

VEGABAR 24 19

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 simultane­ously.

P max

-0,3

mbar

1)

1) 1) 1)

Language

VEGABAR is adjusted to the order

Lan-

guage

language as default. The lan­guages German, English, Italian or
Spanish can be chosen with the

Lan-

“+“ or “–“-key and the “OK“-key.

guage

English

Deutsch
Franc.
Ital.
Español

150

mbar

min

max

min

max

Temp.

30,7

)

)

)

)

T max

T min

23,5

°C

°C

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

Bargraph

Digital value

20 VEGABAR 24

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 24 21

Checking the electrical components

Diagnosis

–

–+

1 2 3

mA

Current meter for
local control

Voltage

V

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 24

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 24 23

Instrument modification

6.2 Exchange of the hygienic form seal on VEGABAR 24

The ceramic measuring cell is sealed radially
gapfree by a form seal on VEGABAR 24
process pressure transmitter with hygienic
fitting LA or LB. This form seal (material
EPDM-FDA 1) approved) can be exchanged
by the user without re-adjustment being
necessary. The criteria and time periods for
such an exchange are defined by process
conditions and hygienic requirements.

Important:

Only use the original VEGA replacement part,
article no. 2.17 775 as seal ring!

Note the below procedure when exchanging
the seal.

Exchange procedure:

1 Pressure transmitter should be unpres-

surized (switch off process pressure or
empty vessel).

2 Loosen the hexagonal screw (1) with

SW 46 by turning anticlockwise

Note!

The process connection (2) (i.e. compression
nut) must not be loosened!

Installation procedure:

6 Pull a new form seal (5) over the measur-

ing cell (the conical end should point
towards the process connection!).

7 Insert the pressure transmitter carefully

into the process connection by turning
clockwise.

8 Tighten hexagonal screw (1) with SW 46

to its fixed position (45 Nm).

9 Return the housing (4) of the pressure

transmitter to its original position

Exchange of the form seal is now finished,
ensure appropriate disposal of the removed
seal.

3 Completely loosen pressure screw and

remove the pressure transmitter from the
process connection

Note:

Should the pressure transmitter turn by loos­ening the pressure screw, it can be held by
the adapter (3) with a screw driver (SW 36).

4 Slightly lift the form seal (5) (with a knife

or something similar) and loosen it from
the ceramic measuring cell

5 If the form seal (5) does not cover the

1 Hexagon pressure screw
2 Process connection
3 Adapter
4 Housing
5 Form seal

measuring cell, it should be carefully
removed from the process connection.

1)

Food and Drugs Administration

24 VEGABAR 24

Notes

VEGABAR 24 25

Notes

26 VEGABAR 24

Notes

VEGABAR 24 27

VEGA Grieshaber KG
Am Hohenstein 113
D-77761 Schiltach
Phone [phone] - 0
Fax [phone] - 201
e-mail [e-mail]

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.

2.23 426 / July ’99