Vega VEGABAR 81 User manual

Quick setup guide
Pressure transmitter with metallic
measuring cell
VEGABAR 81
Slave sensor for electronic differential pres-
sure
With SIL qualication
Document ID: 48050

2
Contents
VEGABAR 81 • Slave sensor for electronic dierential pressure
48050-EN-160212
Contents
1 For your safety
1.1 Authorised personnel ....................................................................................................... 3
1.2 Appropriate use................................................................................................................ 3
1.3 Warning about incorrect use............................................................................................. 3
1.4 General safety instructions ............................................................................................... 3
1.5 CE conformity................................................................................................................... 3
1.6 SIL qualication according to IEC 61508.......................................................................... 4
1.7 Permissible process pressure .......................................................................................... 4
2 Product description
2.1 Conguration.................................................................................................................... 5
3 Mounting
3.1 General instructions for use of the instrument .................................................................. 6
3.2 Ventilation and pressure compensation............................................................................ 6
3.3 Combination Master - Slave ............................................................................................. 6
4 Connecting to power supply
4.1 Connecting....................................................................................................................... 9
4.2 Single chamber housing................................................................................................. 10
4.3 Connection example ...................................................................................................... 11
5 Set up with the display and adjustment module
5.1 Insert display and adjustment module............................................................................ 12
5.2 Parameter adjustment .................................................................................................... 13
6 Supplement
6.1 Technical data ................................................................................................................ 18
Information:
This quick setup guide enables quick setup and commissioning of
your instrument.
You can nd supplementary information in the corresponding, more
detailed Operating Instructions Manual as well as the Safety Manual
that comes with instruments with SIL qualication. These manuals are
available on the supplied DVD or in the download area of "www.vega.
com".
Operating instructions VEGABAR 81 - Slave sensor for elec-
tronic dierential pressure with SIL qualication: Document-ID
48045
Safety Manual VEGABAR series 80 - Two-wire 4 … 20 mA/HART
with SIL qualication: Document-ID 48369
Editing status of the quick setup guide: 2016-02-04

3
1 For your safety
VEGABAR 81 • Slave sensor for electronic dierential pressure
48050-EN-160212
1 For your safety
1.1 Authorised personnel
All operations described in this operating instructions manual must
be carried out only by trained specialist personnel authorised by the
plant operator.
During work on and with the device the required personal protective
equipment must always be worn.
1.2 Appropriate use
VEGABAR 81 is a slave sensor for electronic dierential pressure
measurement.
You can nd detailed information about the area of application in
chapter "Product description".
Operational reliability is ensured only if the instrument is properly
used according to the specications in the operating instructions
manual as well as possible supplementary instructions.
1.3 Warning about incorrect use
Inappropriate or incorrect use of the instrument can give rise to
application-specic hazards, e.g. vessel overll or damage to system
components through incorrect mounting or adjustment. Also the pro-
tective characteristics of the instrument can be inuenced.
1.4 General safety instructions
This is a high-tech instrument requiring the strict observance of stand-
ard regulations and guidelines. The user must take note of the safety
instructions in this operating instructions manual, the country-specic
installation standards as well as all prevailing safety regulations and
accident prevention rules.
The instrument must only be operated in a technically awless and
reliable condition. The operator is responsible for trouble-free opera-
tion of the instrument.
During the entire duration of use, the user is obliged to determine the
compliance of the necessary occupational safety measures with the
current valid rules and regulations and also take note of new regula-
tions.
1.5 CE conformity
The device fullls the legal requirements of the applicable EC guide-
lines. By axing the CE marking, we conrm successful testing of the
product.
You can nd the CE Certicate of Conformity in the download section
of our homepage.

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1 For your safety
VEGABAR 81 • Slave sensor for electronic dierential pressure
48050-EN-160212
1.6 SIL qualication according to IEC 61508
The Safety Integrity Level (SIL) of an electronic system is used to as-
sess the reliability of integrated safety functions.
For detailed specication of the safety requirements, multiple SIL
levels are specied according to safety standard IEC 61508. You can
nd detailed information in chapter "Functional safety (SIL)"
The instrument meets the specications of IEC 61508: 2010 (Edi-
tion 2). It is qualied for single-channel operation up to SIL2. The
instrument can be used homogeneously redundant up to SIL3 in
multi-channel architecture with HFT 1.
1.7 Permissible process pressure
The permissible process pressure is specied on the type label with
"Process pressure", see chapter "Conguration". For safety reasons,
this range may not be exceeded. This applies even if a measuring cell
with a measuring range (order-related) higher than the permissible
pressure range of the process tting is installed.

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2 Product description
VEGABAR 81 • Slave sensor for electronic dierential pressure
48050-EN-160212
2 Product description
2.1 Conguration
The type label contains the most important data for identication and
use of the instrument:
2
1
13
14
15
12
10
11
5
3
6
4
7
8
9
Fig. 1: Layout of the type label (example)
1 Instrument type
2 Product code
3 Field for approvals
4 Power supply and signal output, electronics
5 Protection rating
6 Measuring range
7 Permissible process pressure
8 Material, wetted parts
9 Order number
10 Serial number of the instrument
11 Data-Matrix-Code for smartphone app
12 Symbol of the device protection class
13 ID numbers, instrument documentation
14 Reminder to observe the instrument documentation
15 SILidentication
The type label contains the serial number of the instrument. With it
you can nd the following instrument data on our homepage:
• Product code (HTML)
• Delivery date (HTML)
• Order-specic instrument features (HTML)
• Operating instructions, quick setup guide and Safety Manual at the
time of shipment (PDF)
• Test certicate (PDF) - optional
Go to www.vega.com, "VEGA Tools" and "Instrument search". Enter
the serial number.
Alternatively, you can access the data via your smartphone:
• Download the smartphone app "VEGA Tools" from the "Apple App
Store" or the "Google Play Store"
• Scan the Data Matrix code on the type label of the instrument or
• Enter the serial number manually in the app
Type label
Serial number - Instru-
ment search

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3 Mounting
VEGABAR 81 • Slave sensor for electronic dierential pressure
48050-EN-160212
3 Mounting
3.1 General instructions for use of the instrument
Protect your instrument against moisture ingress through the following
measures:
• Use the recommended cable (see chapter "Connecting to power
supply")
• Tighten the cable gland
• When mounting horizontally, turn the housing so that the cable
gland points downward
• Loop the connection cable downward in front of the cable gland
This applies mainly to outdoor installations, in areas where humidity is
expected (e.g. through cleaning processes) and on cooled or heated
vessels.
3.2 Ventilation and pressure compensation
The lter element is mounted into the electronics housing. It has the
following functions:
• Ventilation of the electronics housing
• Atmospheric pressure compensation (with relative pressure meas-
uring ranges)
→ Turn the housing so that the lter element points downward after
the instrument is installed. This provides better protection against
buildup.
1 2 3
4 4 4
Fig.2:Positionofthelterelement-non-Ex,Ex-iaversion
1 Housing plastic, stainless steel precision casting
2 Housing aluminium
3 Housing stainless steel, electropolished
4 Filter element
With the following instruments a blind plug is installed instead of the
lter element:
• Instruments in protection IP 66/IP 68 (1 bar) - ventilation via capil-
laries in non-detachable cable
• Instruments with absolute pressure
3.3 Combination Master - Slave
In principle, any sensor combination within the VEGABAR 80 series is
allowed. The following requirements must be fullled:
Protection against mois-
ture
Instruments in non-Ex
and Ex-ia version

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3 Mounting
VEGABAR 81 • Slave sensor for electronic dierential pressure
48050-EN-160212
• Conguration, Master sensor suitable for electronic dierential
pressure
• Pressure type is identical for both sensors, i.e. relative pressure/
relative pressure or absolute pressure/absolute pressure
• Master sensor measures the higher pressure
• Measurement setup as shown in the following chapters
The measuring range of each sensor is selected such that it ts the
measuring loop. For this, the max. recommended turn down must be
noted. See chapter "Technical data". It is absolutely necessary the the
measuring ranges of Master and Slave correspond.
Measurement result = Measured value of Master (total pres-
sure) - measured value of Slave (static pressure)
Depending on the application, individual combinations can result, see
following examples:
Data
Application: Level measurement
Medium: Water
Vessel height: 12 m, hydrostatic pressure = 12 m x 1000 kg/m3x
9.81 m/s2 = 117.7 kPa = 1.18 bar
Superimposed pressure: 1 bar
Total pressure: 1.18 bar + 1 bar = 2.18 bar
Instrument selection
Nominal measuring range Master: 2.5 bar
Nominal measuring range Slave: 1 bar
Turn Down: 2.5 bar/1.18 bar = 2.1 : 1
Data
Application: Level measurement
Medium: Water
Vessel height: 500 mm, hydrostatic pressure = 0.50 m x 1000 kg/m3x
9.81 m/s2 = 4.9 kPa = 0.049 bar
Superimposed pressure: 350 mbar = 0.35 bar
Total pressure: 0.049 bar + 0.35 bar = 0.399 bar
Instrument selection
Nominal measuring range Master: 0.4 bar
Nominal measuring range Slave: 0.4 bar
Turn Down: 0.4 bar /0.049 bar = 8.2 : 1
Data
Application: Dierential pressure measurement
Medium: Gas
Static pressure: 0.8 bar
Dierential pressure on orice: 50 mbar bar = 0.050 bar
Total pressure: 0.8 bar bar + 0.05 bar = 0.85 bar
Example - large vessel
Example - small vessel
Example - orice in
pipeline

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3 Mounting
VEGABAR 81 • Slave sensor for electronic dierential pressure
48050-EN-160212
Instrument selection
Nominal measuring range Master: 1 bar
Nominal measuring range Slave: 1 bar
Turn Down: 1 bar/0.050 bar = 20 : 1
The measuring result (level, pressure dierence) as well as measured
value Slave (static or superimposed pressure) are outputted by the
sensor. Depending on the instrument version, output as 4 … 20 mA
signal or digitally via HART, Probus PA or Foundation Fieldbus.
Output measured values

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4 Connecting to power supply
VEGABAR 81 • Slave sensor for electronic dierential pressure
48050-EN-160212
4 Connecting to power supply
4.1 Connecting
The connection to the Master sensor is carried out through spring-
loaded terminals in the respective housing. For this, use the supplied,
confectioned cable. Solid cores as well as exible cores with cable
end sleeves are inserted directly into the terminal openings.
In case of exible cores without end sleeves, press the terminal from
above with a small screwdriver, the terminal opening is then free.
When the screwdriver is released, the terminal closes again.
Information:
The terminal block is pluggable and can be removed from the
electronics. To do this, lift the terminal block with a small screwdriver
and pull it out. When reinserting the terminal block, you should hear it
snap in.
You can nd further information on the max. wire cross-section under
"Technical data/Electromechanical data"
Proceed as follows:
1. Unscrew the housing lid
2. Loosen compression nut of the cable gland and remove blind
plug
3. Remove approx. 10 cm (4 in) of the cable mantle, strip approx.
1 cm (0.4 in) insulation from the individual wires or use supplied
connection cable
4. Insert the cable into the sensor through the cable entry
Fig. 3: Connection steps 5 and 6
5. Insert the wire ends into the terminals according to the wiring plan
6. Check the hold of the wires in the terminals by lightly pulling on
them
Connection technology
Connection procedure

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4 Connecting to power supply
VEGABAR 81 • Slave sensor for electronic dierential pressure
48050-EN-160212
7. Connect the screen to the internal ground terminal, connect the
external ground terminal to potential equalisation
8. Tighten the compression nut of the cable entry gland. The seal
ring must completely encircle the cable
9. Unscrew the blind plug on the Master, screw in the supplied cable
gland
10. Connection cable to Master, see steps 3 to 8
11. Screw the housing lid back on
The electrical connection is nished.
4.2 Single chamber housing
The following illustration applies to the non-Ex, Ex-ia and Ex-d-ia
version.
5678 4
2
1
connect to Master
Fig. 4: Wiring plan VEGABAR 81 Slave sensor
1 To the Master sensor
2 Ground terminal for connection of the cable screen1)
Electronics and terminal
compartment
1) Connect screen here. Connect ground terminal on the outside of the housing
to ground as prescribed. The two terminals are galvanically connected.