Operating Instructions
TDR sensor for continuous level and
interface measurement of liquids
VEGAFLEX 81
4 … 20 mA/HART two-wire
Document ID: 41824
Quick start
Mounting
Electrical connection
Quick start
The quick start procedure enables a quick setup with many applica-
tions. You can nd further information in the respective chapters of the
operating instructions manual.
1. Distance from the metallic vessel wall > 300 mm. Distance from
non-metallic vessel wall > 500 mm. The probe must not touch any
installations or the vessel wall.
2. In non-metallic vessels, place a metal sheet beneath the process
tting.
1 2
Fig. 1: Installation in non-metallic vessel
1 Flange
2 Metal sheet
3. If necessary, fasten probe end.
For further information see chapter "Mounting".
1. Make sure that the power supply corresponds to the specica-
tions on the type label.
2. Connect the instrument according to the following illustration
2
Set parameters
2
4...20mA
+
( )
(-)
1
2
5
678
1
3
4
Fig. 2: Electronics and connection compartment, single chamber housing
1 Voltage supply, signal output
2 For display and adjustment module or interface adapter
3 For external display and adjustment unit
4 Ground terminal for connection of the cable screen
See also chapter "Connecting to power supply"
For standard applications we recommend selecting the "Quick setup"
in the display and adjustment module.
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
41824-EN-130612
Quick start
1. In this menu item you can select the application. You can choose
between level and interface measurement.
2. In the menu item "Medium - Dielectric constant" you can dene
the medium type (medium).
3. Carry out the adjustment in the menu items "Min. adjustment" and
"Max. adjustment".
4. A "Linearization" is recommended for all vessels in which the
vessel volume does not increase linearly with the level - e.g. in a
horizontal cylindrical or spherical tank. Activate the appropriate
curve.
5. A "False signal suppression" detects, marks and saves the false
signals so that they are no longer taken into account for level
measurement. We generally recommend a false signal suppres-
sion.
Parameterization example
The sensor measures the distance from the sensor (reference plane)
to the product surface. See also chapter "Parameter adjustment".
Fig. 3: Measuring ranges - VEGAFLEX 81
1 Reference plane
2 Probe length L
3 Measuring range (default setting refers to the measuring range in water)
4 Upper dead band (in this area no measurement is possible)
5 Lower dead band (in this area no measurement is possible)
For this adjustment, the distance is entered when the vessel is full
and nearly empty. If these values are not known, an adjustment with
other distances, for example, 10 % and 90 % is also possible. Starting
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
1
4
2
2
3
5
1
4
3
5
3
Quick start
Further steps
point for these distance specications is always the seal surface of
the thread or ange.
1. In the menu "Additional settings", menu item "Damping" you can
adjust the requested damping of the output signal.
2. Select the parameter of the current output and the output characteristics in the menu item "Current output".
41824-EN-130612
4
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
Contents
1 About this document
1.1 Function ........................................................................................................................... 7
1.2 Target group ..................................................................................................................... 7
1.3 Symbolism used ............................................................................................................... 7
2 For your safety
2.1 Authorised personnel ....................................................................................................... 8
2.2 Appropriate use ................................................................................................................ 8
2.3 Warning about incorrect use ............................................................................................. 8
2.4 General safety instructions ............................................................................................... 8
2.5 CE conformity ................................................................................................................... 8
2.6 NAMUR recommendations .............................................................................................. 9
2.7 Environmental instructions ............................................................................................... 9
3 Product description
3.1 Conguration .................................................................................................................. 10
3.2 Principle of operation...................................................................................................... 11
3.3 Packaging, transport and storage ................................................................................... 14
3.4 Accessories and replacement parts ............................................................................... 14
4 Mounting
4.1 General instructions ....................................................................................................... 17
4.2 Mounting instructions ..................................................................................................... 17
5 Connecting to power supply
5.1 Preparing the connection ............................................................................................... 24
5.2 Connecting ..................................................................................................................... 25
5.3 Wiring plan, single chamber housing.............................................................................. 27
5.4 Wiring plan, double chamber housing ............................................................................ 27
5.5 Wiring plan, Ex-d-ia double chamber housing ................................................................ 29
5.6 Wiring plan - version IP 66/IP 68, 1 bar ........................................................................... 30
5.7 Supplementary electronics ............................................................................................. 31
5.8 Switch-on phase............................................................................................................. 31
6 Set up with the display and adjustment module
6.1 Insert display and adjustment module ............................................................................ 33
6.2 Adjustment system ......................................................................................................... 34
6.3 Parameter adjustment - Quick setup .............................................................................. 35
6.4 Parameter adjustment - Extended adjustment................................................................ 38
6.5 Saving the parameter adjustment data ........................................................................... 57
7 Setup with PACTware
7.1 Connect the PC .............................................................................................................. 58
7.2 Parameter adjustment with PACTware ............................................................................ 59
7.3 Set up with the quick setup ............................................................................................. 60
7.4 Saving the parameter adjustment data ........................................................................... 64
8 Set up with other systems
8.1 DD adjustment programs ............................................................................................... 65
8.2 Field Communicator 375, 475 ........................................................................................ 65
9 Diagnostics and service
9.1 Maintenance .................................................................................................................. 66
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VEGAFLEX 81 • 4 … 20 mA/HART two-wire
Contents
5
Contents
9.2 Diagnosis memory ......................................................................................................... 66
9.3 Status messages ............................................................................................................ 67
9.4 Rectify faults ................................................................................................................... 71
9.5 Exchanging the electronics module ................................................................................ 74
9.6 Exchanging the cable/rod ............................................................................................... 75
9.7 Software update ............................................................................................................. 76
9.8 How to proceed in case of repair .................................................................................... 77
10 Dismounting
10.1 Dismounting steps.......................................................................................................... 78
10.2 Disposal ......................................................................................................................... 78
11 Supplement
11.1 Technical data ................................................................................................................ 79
11.2 Dimensions .................................................................................................................... 90
41824-EN-130612
Safety instructions for Ex areas
Please note the Ex-specic safety information for installation and operation in Ex areas. These safety instructions are part of the operating
instructions manual and come with the Ex-approved instruments.
Editing status: 2013-06-11
6
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
1 About this document
1 About this document
1.1 Function
This operating instructions manual provides all the information you
need for mounting, connection and setup as well as important instructions for maintenance and fault rectication. Please read this information before putting the instrument into operation and keep this manual
accessible in the immediate vicinity of the device.
1.2 Target group
This operating instructions manual is directed to trained specialist
personnel. The contents of this manual should be made available to
these personnel and put into practice by them.
1.3 Symbolism used
Information, tip, note
This symbol indicates helpful additional information.
Caution: If this warning is ignored, faults or malfunctions can result.
Warning: If this warning is ignored, injury to persons and/or serious
damage to the instrument can result.
Danger: If this warning is ignored, serious injury to persons and/or
destruction of the instrument can result.
Ex applications
This symbol indicates special instructions for Ex applications.
List
•
The dot set in front indicates a list with no implied sequence.
Action
→
This arrow indicates a single action.
1 Sequence of actions
Numbers set in front indicate successive steps in a procedure.
Battery disposal
This symbol indicates special information about the disposal of batteries and accumulators.
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
7
2 For your safety
2 For your safety
2.1 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.
2.2 Appropriate use
VEGAFLEX 81 is a sensor for continuous level measurement.
You can nd detailed information on the application range in chapter
"Product description".
Operational reliability is ensured only if the instrument is properly
used according to the specications in the operating instructions
manual as well as possible supplementary instructions.
2.3 Warning about incorrect use
Inappropriate or incorrect use of the instrument can give rise to
application-specic hazards, e.g. vessel overll or damage to system
components through incorrect mounting or adjustment.
2.4 General safety instructions
This is a state-of-the-art instrument complying with all prevailing
regulations and guidelines. The instrument must only be operated in a
technically awless and reliable condition. The operator is responsible
for the trouble-free operation 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.
The safety instructions in this operating instructions manual, the national installation standards as well as the valid safety regulations and
accident prevention rules must be observed by the user.
For safety and warranty reasons, any invasive work on the device
beyond that described in the operating instructions manual may be
carried out only by personnel authorised by the manufacturer. Arbitrary conversions or modications are explicitly forbidden.
The safety approval markings and safety tips on the device must also
be observed.
2.5 CE conformity
The device fullls the legal requirements of the applicable EC guidelines. By axing the CE marking, we conrm successful testing of the
product.
You can nd the CE Certicate of Conformity in the download section
of our homepage.
8
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
41824-EN-130612
2 For your safety
Electromagnetic compatibility
Instruments with plastic housing as well as in four-wire or Ex-d-ia
version are designed for use in an industrial environment. Nevertheless, electromagnetic interference from electrical conductors and
radiated emissions must be taken into account, as is usual with a
class A instrument according to EN 61326-1. If the instrument is used
in a dierent environment, the electromagnetic compatibility to other
instruments must be ensured by suitable measures.
2.6 NAMUR recommendations
NAMUR is the automation technology user association in the process
industry in Germany. The published NAMUR recommendations are
accepted as the standard in eld instrumentation.
The device fullls the requirements of the following NAMUR recom-
mendations:
NE 21 – Electromagnetic compatibility of equipment
•
NE 43 – Signal level for malfunction information from measuring
•
transducers
NE 53 – Compatibility of eld devices and display/adjustment
•
components
NE 107 – Self-monitoring and diagnosis of eld devices
•
For further information see www.namur.de.
2.7 Environmental instructions
Protection of the environment is one of our most important duties.
That is why we have introduced an environment management system
with the goal of continuously improving company environmental protection. The environment management system is certied according
to DIN EN ISO 14001.
Please help us fulll this obligation by observing the environmental
instructions in this manual:
Chapter "Packaging, transport and storage"
•
Chapter "Disposal"
•
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VEGAFLEX 81 • 4 … 20 mA/HART two-wire
9
3 Product description
Type plate
3 Product description
3.1 Conguration
The nameplate contains the most important data for identication and
use of the instrument:
1
2
3
4
5
6
7
8
9
10
Fig. 4: Layout of the type label (example)
1 Instrument type
2 Product code
3 Approvals
4 Power supply and signal output, electronics
5 Protection rating
6 Probe length
7 Process and ambient temperature, process pressure
8 Material, wetted parts
9 Hardware and software version
10 Order number
11 Serial number of the instrument
12 Symbol of the device protection class
13 ID numbers, instrument documentation
14 Reminder to observe the instrument documentation
15 NotiedauthorityforCEmarking
16 Approval directives
16
15
14
13
12
11
Serial number
10
With the serial number of the instrument on the type label you can nd
the following data on our homepage:
Article number of the instrument (HTML)
•
Delivery date (HTML)
•
Order-specic instrument features (HTML)
•
Operating instructions at the time of shipment (PDF)
•
Order-specic sensor data for an electronics exchange (XML)
•
Test certicate pressure transmitters (PDF)
•
Go to www.vega.com, "VEGA Tools" and "Serial number search".
As an alternative, you can nd 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 into the App
•
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
41824-EN-130612
3 Product description
Scope of this operating
instructions manual
Versions
Scope of deliv
Application area
ery
This operating instructions manual applies to the following instrument
versions:
Hardware from 1.0.0
•
Software from 1.0.0
•
Only for instrument versions without SIL qualication
•
The instrument and the electronics version can be determined via the
product code on the type label as well as on the electronics.
Standard electronics: Type FX80H.-
•
The scope of delivery encompasses:
Sensor
•
Documentation
•
– this operating instructions manual
– Test certicate measuring accuracy (optional)
– Operating instructions manual "Display and adjustment mod-
ule" (optional)
– Supplementary instructions "GSM/GPRS radio module"
(optional)
– Supplementary instructions manual "Heating for display and
adjustment module" (optional)
– Supplementary instructions manual "Plug connector for con-
tinuously measuring sensors" (optional)
– Ex-specic "Safety instructions" (with Ex versions)
– if necessary, further certicates
3.2 Principle of operation
The VEGAFLEX 81 is a level sensor with cable or rod probe for
continuous level or interface measurement, suitable for applications
in liquids.
Functional principle level measurement
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
High frequency microwave pulses are guided along a steel cable or
a rod. Upon reaching the product surface, the microwave pulses are
reected. The running time is evaluated by the instrument and outputted as level.
11
3 Product description
1
d
h
Fig. 5: Level measurement
1 Sensorreferenceplane(sealsurfaceoftheprocesstting)
d Distance to the interface (HART value 1)
h Height - Level
Probe end tracking
To increase sensitivity, the probe is equipped with probe end tracking.
In products with a low dielectric constant, this function is very helpful.
This is the case, for example, in plastic granules, packing chips or in
vessels with uidized products.
Between a dielectric constant of 1.5 and 3, the function switches on, if
required. As soon as the level echo can no longer be detected, probe
end tracking is automatically activated. The measurement is contin-
ued with the last calculated dielectric constant.
The accuracy thus depends on the stability of the dielectric constant.
If you measure a medium with a dielectric constant below 1.5, probe
end tracking is always active. In this case, you have to enter the
dielectric constant of the medium. A stable dielectric constant is very
important here.
Functional principle - inter
f
ace measurement
12
High frequency microwave impulses are guided along a steel cable or
rod. Upon reaching the product surface, a part of the microwave impulses is reected. The other part passes through the upper product
and is reected by the interface. The running times to the two product
layers are processed by the instrument.
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
L3
L2
3 Product description
1
d2
d1
TS
Prerequisites for interface measurement
h2
h1
Fig. 6: Interface measurement
1 Sensorreferenceplane(sealsurfaceoftheprocesstting)
d1 Distance to the interface (HART value 1)
d2 Distance to the level (HART value 3)
TS Thickness of the upper medium (d1 - d2)
h1 Height - Interface
h2 Height - Level
L1 Lower medium
L2 Upper medium
L3 Gas phase
Upper medium (L2)
The upper medium must not be conductive
•
The dielectric constant of the upper medium or the actual distance
•
to the interface must be known (input required). Min. dielectric constant: 1.6. You can nd a list of dielectric constants on our home
page: www.vega.com.
The composition of the upper medium must be stable, no varying
•
products or mixtures
The upper medium must be homogeneous, no stratications
•
within the medium
Min. thickness of the upper medium 50 mm (1.97 in)
•
Clear separation from the lower medium, emulsion phase or detri-
•
tus layer max. 50 mm (1.97 in)
If possible, no foam on the surface
•
L1
Lower medium (L1)
The dielectric constant must be 10 higher than the dielectric
•
constant of the upper medium, preferably electrically conductive.
Example: upper medium dielectric constant 2, lower medium at
least dielectric constant 12.
Gas phase (L3)
Air or gas mixture
•
Gas phase - dependent on the application, gas pahse does not
•
always exist (d2 = 0)
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13
3 Product description
Output signal
Pack
aging
Transport
Transport inspection
Storage
Storage and transport
temperature
The instrument is always preset to the application "Level measurement".
For the interface measurement, you can select the requested output
signal with the setup.
3.3 Packaging, transport and storage
Your instrument was protected by packaging during transport. Its
capacity to handle normal loads during transport is assured by a test
based on ISO 4180.
The packaging of standard instruments consists of environmentfriendly, recyclable cardboard. For special versions, PE foam or PE
foil is also used. Dispose of the packaging material via specialised
recycling companies.
Transport must be carried out under consideration of the notes on the
transport packaging. Nonobservance of these instructions can cause
damage to the device.
The delivery must be checked for completeness and possible transit
damage immediately at receipt. Ascertained transit damage or con-
cealed defects must be appropriately dealt with.
Up to the time of installation, the packages must be left closed and
stored according to the orientation and storage markings on the
outside.
Unless otherwise indicated, the packages must be stored only under
the following conditions:
Not in the open
•
Dry and dust free
•
Not exposed to corrosive media
•
Protected against solar radiation
•
Avoiding mechanical shock and vibration
•
Storage and transport temperature see chapter "Supplement -
•
Technical data - Ambient conditions"
Relative humidity 20 … 85 %
•
PLICSCOM
VEGACONNECT
14
3.4 Accessories and replacement parts
The display and adjustment module PLICSCOM is used for measured
value indication, adjustment and diagnosis. It can be inserted into the
sensor or the external display and adjustment unit and removed at
any time.
You can nd further information in the operating instructions "Display
and adjustment module PLICSCOM" (Document-ID 27835).
The interface adapter VEGACONNECT enables the connection of
communication-capable instruments to the USB interface of a PC. For
parameter adjustment of these instruments, the adjustment software
PACTware with VEGA-DTM is required.
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
41824-EN-130612
3 Product description
You can nd further information in the operating instructions "Interface
adapter VEGACONNECT" (Document-ID 32628).
VEGADIS 81
VEGADIS 62
PLICSMOBILE
Protective cap
Flanges
T61
The VEGADIS 81 is an external display and adjustment unit for VEGA
®
plics
sensors.
For sensors with double chamber housing the interface adapter
"DISADAPT" is also required for VEGADIS 81.
You can nd further information in the operating instructions "VE-
GADIS 81" (Document-ID 43814).
VEGADIS 62 is suitable for measured value indication and adjustment
of sensors with HART protocol. It is looped into the 4 … 20 mA/HART
signal cable.
You can nd further information in the operating instructions "VEGADIS 62" (Document-ID 36469).
The PLICSMOBILE T61 is an external GSM/GPRS radio unit for
transmission of measured values and for remote parameter adjustment of plics
®
sensors. The adjustment is carried out via PACTware/
DTM by using the integrated USB connection.
You can nd further information in the supplementary instructions
"PLICSMOBILE T61" (Document-ID 36849).
The protective cover protects the sensor housing against soiling and
intense heat from solar radiation.
You will nd additional information in the supplementary instructions
manual "Protective cover" (Document-ID 34296).
Screwed anges are available in dierent versions according to the
following standards: DIN 2501, EN 1092-1, ANSI B 16.5, JIS B 22101984, GOST 12821-80.
You can nd additional information in the supplementary instructions
manual "Flanges according to DIN-EN-ASME-JIS" (Document-ID
31088).
Electronics module
The electronics module VEGAFLEX series 80 is a replacement part
for TDR sensors of VEGAFLEX series 80. There is a dierent version
available for each type of signal output.
You can nd further information in the operating instructions manual
"Electronics module VEGAFLEX series 80".
Display and adjustment
module with heating
The display and adjustment module can be optionally replaced by a
display and adjustment module with heating function.
You can use this display and adjustment module in an ambient tem-
perature range of -40 … +70 °C.
You can nd further information in the operating instructions "Display
and adjustment module with heating" (Document-ID 31708).
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
15
3 Product description
Rod extension
B
ypass tube
Spacer
If you are using an instrument with rod version, you can extend the
rod probe individually with curved segments and rod extensions of
dierent lengths.
All extensions used must not exceed a total length of 6 m (19.7 ft).
The extensions are available in the following lengths:
Rod: ø 12 mm (0.472 in)
Basic segments: 20 … 5900 mm (0.79 … 232 in)
•
Rod segments: 20 … 5900 mm (0.79 … 232 in)
•
Curved segments: 100 x 100 mm (3.94 … 3.94 in)
•
You can nd further information in the operating instructions manual
"Rod extension VEGAFLEX series 80".
The combination of a bypass tube and a VEGAFLEX 81 enables con-
tinuous level measurement outside the vessel. The bypass consists
of a standpipe which is mounted as a communicating container on
the side of the vessel via two process ttings. This kind of mounting
ensures that the level in the standpipe and the level in the vessel are
the same.
The length and the process ttings can be congured individually. No
dierent connection versions available.
You can nd further information in the operating instructions manual
"Bypass tube VEGAPASS 81".
If you mount the VEGAFLEX 81 in a bypass tube or standpipe, you
have to avoid contact to the bypass tube by using a spacer at the
probe end.
You can nd additional information in the operating instructions
manual "Centering".
16
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
Screwing in
4 Mounting
4 Mounting
4.1 General instructions
On instruments with process tting thread, the hexagon must be tightened with a suitable screwdriver. Wrench size see chapter "Dimen-
sions".
Warning:
The housing must not be used to screw the instrument in! Applying
tightening force can damage internal parts of the housing.
Protection against moisture
Protective caps
Suitability for the process
conditions
Protect your instrument further through the following measures
against moisture penetration:
Use the recommended cable (see chapter "Connecting to power
•
supply")
Tighten the cable gland
•
Loop the connection cable downward in front of the cable gland
•
This applies particularly to:
Outdoor mounting
•
Installations in areas where high humidity is expected (e.g. through
•
cleaning processes)
Installations on cooled or heated vessels
•
In the case of instrument housings with self-sealing NPT threads, it is
not possible to have the cable entries screwed in at the factory. The
openings for the cable glands are therefore covered with red protective caps as transport protection.
Prior to setup you have to replace these protective caps with approved cable glands or close the openings with suitable blind plugs.
The suitable cable glands and blind plugs come with the instrument.
Make sure that all parts of the instrument exposed to the process are
suitable for the existing process conditions.
These are mainly:
Active measuring component
•
Process tting
•
Process seal
•
Process conditions are particularly:
Process pressure
•
Process temperature
•
Chemical properties of the medium
•
Abrasion and mechanical inuences
•
You can nd the specications of the process conditions in chapter
"Technical data" as well as on the nameplate.
4.2 Mounting instructions
Installation position
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
Mount VEGAFLEX 81 in such a way that the distance to vessel installations or to the vessel wall is at least 300 mm (12 in). In non-metallic
17
4 Mounting
vessels, the distance to the vessel wall should be at least 500 mm
(19.7 in).
During operation, the probe must not touch any installations or the
vessel wall. If necessary, fasten the probe end.
In vessels with conical bottom it can be advantageous to mount the
sensor in the center of the vessel, as measurement is then possible
nearly down to the lowest point of the bottom. Keep in mind that
measurement all the way down to the tip of the probe may not be possible. The exact value of the min. distance (lower dead band) is stated
in chapter "Technical data".
Fig. 7: Vessel with conical bottom
Type of vessel
18
Plastic vessel/Glass vessel
The guided microwave principle requires a metal surface on the process tting. Therefore use in plastic vessels etc. an instrument version
with ange (from DN 50) or place a metal sheet (ø > 200 mm/8 in)
beneath the process tting when screwing it in.
Make sure that the plate has direct contact with the process tting.
When installing rod or cable probes in vessels without metal walls,
e.g. in plastic vessels, the measured value can be inuenced by
strong electromagnetic elds (emitted interference according to
EN 61326: class A). In this case, use a probe with coaxial version.
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
1 2
dh
Fig. 8: Installation in non-metallic vessel
1 Flange
2 Metal sheet
4 Mounting
Socket
If possible, avoid sockets. Mount the sensor ush with the vessel top.
If this is not possible, use short sockets with small diameter.
Higher sockets or sockets with a bigger diameter can generally be
used. They can, however, increase the upper blocking distance (dead
band). Check if this is relevant for your measurement.
In such cases, always carry out a false signal suppression after installation. You can nd further information under "Setup procedure".
_
<
150
_
<
100
Fig. 9: Mounting socket
DN40 ... DN150
> DN150 ... DN200
d
h
When welding the socket, make sure that the socket is ush with the
vessel top.
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
19
4 Mounting
1 2
Fig.10:Socketmustbeinstalledush
1 Unfavourable installation
2 Socketush-optimuminstallation
Welding work
Inowingmedium
Measuring range
Before beginning the welding work, remove the electronics module
from the sensor. By doing this, you avoid damage to the electronics
through inductive coupling.
Do not mount the instruments in or above the lling stream. Make sure
that you detect the product surface, not the inowing product.
Fig.11:Mountingofthesensorwithinowingmedium
The reference plane for the measuring range of the sensors is the
sealing surface of the thread or ange.
Keep in mind that a min. distance must be maintained below the refer-
ence plane and possibly also at the end of the probe - measurement
in these areas is not possible (dead band). The length of the cable
can be used all the way to the end only when measuring conductive
41824-EN-130612
20
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
4 Mounting
products. These blocking distances for dierent mediums are listed
in chapter "Technical data". Keep in mind for the adjustment that the
default setting for the measuring range refers to water.
Pressure
Standpipes or b
tubes
ypass
The process tting must be sealed if there is gauge or low pressure in
the vessel. Before use, check if the seal material is resistant against
the measured product and the process temperature.
The max. permissible pressure is specied in chapter "Technical
data" or on the type label of the sensor.
Standpipes or bypass tubes are normally metal tubes with a diameter
of 30 … 200 mm (1.18 … 7.87 in). In measurement technology, such
a tube corresponds to a coax probe. It does not matter if the standpipe is perforated or slotted for better mixing. Lateral inlets in bypass
tubes also do not inuence the measurement.
For bypass tubes, select the probe length such that the blocking
distance (dead band) of the probe is above or below the lateral lling
openings. You can thus measure the complete range of the medium in
the bypass tube. When designing the bypass tube, keep the blocking
distance of the probe in mind and select the length above the upper
lateral lling opening accordingly.
Microwaves can penetrate many plastics. For process technical reasons, plastic standpipes are problematic. If durability is no problem,
then we recommend the use of metal standpipes.
When the VEGAFLEX 81 is used in standpipes or bypass tubes,
contact with the tube wall must be avoided. We recommend for this
purpose a cable probe with centering weight.
With rod probes, a spacer is generally not required. However, if there
is a risk of the rod probe being pressed against the tube wall by inowing medium, you should mount a spacer at the probe end to avoid
contact with the tube wall. In the case of cable probes, the cable can
be strained.
Keep in mind that buildup can form on the spacers. Strong buildup
can inuence the measurement.
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VEGAFLEX 81 • 4 … 20 mA/HART two-wire
21
4 Mounting
Fasten
1
Fig. 12: Position of the spacer or centering weight
1 Rod probe with spacer (PEEK)
2 Cable probe with centering weight
3 Spacer (PEEK) on the gravity weight of a cable probe
Note:
Measurement in a standpipe is not recommended for extremely
adhesive products.
Instructions for the measurement:
The 100 % point should not be above the upper tube connection
•
to the vessel
The 0 % point should not be below the lower tube connection to
•
the vessel
A false signal suppression with installed sensor is generally rec-
•
ommended to achieve maximum possible accuracy.
If there is a risk of the cable probe touching the vessel wall during
operation due to product movements or agitators, etc., the measuring
probe should be securely xed.
In the gravity weight there is an internal thread (M8), e.g. for an eyebolt (optional) - (article no. 2.1512).
Make sure that the probe cable is not completely taut. Avoid tensile
loads on the cable.
Avoid undened vessel connections, i.e. the connection must be
either grounded reliably or isolated reliably. Any undened change of
this requirement can lead to measurement errors.
2 3
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22
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
4 Mounting
Lateral installation
1
1
2
2
Fig. 13: Fasten the probe
1 Probe
2 Retaining sleeve
In case of dicult installation conditions, the probe can be also
mounted laterally. For this purpose, adapt the rod with rod extensions
or bow-shaped segments.
Let the probe length determine automatically by the instrument to
compensate the resulting running time changes.
The determine probe length can deviate from the actual probe length
when using bow-shaped segments.
If installations such as struts, ladders, etc. exist on the vessel wall,
then the probe should have a distance to the vessel wall of at least
300 mm (11.81 in).
You can nd further information in the supplementary instructions of
the rod extension.
R
xtension
od e
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VEGAFLEX 81 • 4 … 20 mA/HART two-wire
In case of dicult installation conditions, for example in a socket, the
probe can be adapted respectively with a rod extension.
Let the probe length determine automatically by the instrument to
compensate the resulting running time changes.
You can nd further information in the supplementary instructions of
the rod extension.
23
5 Connecting to power supply
Safety instructions
5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
Connect only in the complete absence of line voltage
•
If overvoltage surges are expected, overvoltage arresters should
•
be installed
V
oltage supply
Connection to signal con
ditioning instruments
Connection cable
Cable gland ½ NPT
Power supply and current signal are carried on the same two-wire
cable. The operating voltage can dier depending on the instrument
version.
The data for power supply are specied in chapter "Technical data".
Provide a reliable separation between the supply circuit and the
mains circuits according to DIN EN 61140 VDE 0140-1.
Keep in mind the following additional factors that inuence the operating voltage:
Lower output voltage of the power supply unit under nominal load
•
(e.g. with a sensor current of 20.5 mA or 22 mA in case of fault
message)
Inuence of additional instruments in the circuit (see load values in
•
chapter "Technical data")
The signal conditioning instruments VEGAMET and VEGASCAN
-
have digital sensor recognition. When connecting VEGAFLEX 81, an
up-to-date version of the signal conditioning instrument software is
required. For a software update go to "www.vega.com/downloads"
and "Software".
The instrument is connected with standard two-wire cable without
screen. If electromagnetic interference is expected which is above the
test values of EN 61326-1 for industrial areas, screened cable should
be used.
Use cable with round cross section for instruments with housing and
cable gland. To ensure the seal eect of the cable gland (IP protection
rating), nd out which cable outer diameter the cable gland is suitable
for.
5 … 9 mm (0.20 … 0.35 in)
•
6 … 12 mm (0.24 … 0.47 in)
•
10 … 14 mm (0.40 … 0.55 in)
•
Use a cable gland tting the cable diameter.
We generally recommend the use of screened cable for HART multi-
drop mode.
With plastic housing, the NPT cable gland or the Conduit steel tube
must be screwed without grease into the threaded insert.
Max. torque for all housings see chapter "Technical data".
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VEGAFLEX 81 • 4 … 20 mA/HART two-wire
5 Connecting to power supply
Cable screening and
grounding
If screened cable is necessary, connect the cable screen on both
ends to ground potential. In the sensor, the screen must be connected
directly to the internal ground terminal. The ground terminal on the
outside of the housing must be connected to the potential equalisation (low impedance).
If potential equalisation currents are expected, the connection on the
processing side must be made via a ceramic capacitor (e. g. 1 nF,
1500 V). The low-frequency potential equalisation currents are thus
suppressed, but the protective eect against high frequency interfer-
ence signals remains.
Warning:
Signicant potential dierences exist inside galvanization plants as
well as on vessels with cathodic corrosion protection. Considerable
equalisation currents can ow over the cable screen if the screen is
grounded on both ends.
To avoid this in such applications, the cable screen must be connect-
ed to ground potential only at one end (in the switching cabinet). The
cable screen must not be connected to the internal ground terminal in
the sensor and the outer ground terminal on the housing must not be
connected to the potential equalisation!
Information:
The metallic parts of the instrument (process tting, transmitter, concentric tube, etc.) are conductively connected with the inner and outer
ground terminal on the housing. This connection exists either directly
via connecting metallic parts or, in case of instruments with external
electronics, via the screen of the special connection cable.
You can nd specications on the potential connections inside the
instrument in chapter "Technical data".
5.2 Connecting
Connection technology
Connection procedure
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VEGAFLEX 81 • 4 … 20 mA/HART two-wire
The voltage supply and signal output are connected via the spring-
loaded terminals in the housing.
The connection to the display and adjustment module or to the inter-
face adapter is carried out via contact pins in the housing.
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.
Proceed as follows:
1. Unscrew the housing cover
2. If a display and adjustment module is installed, remove it by turning it slightly to the left.
3. Loosen compression nut of the cable entry
4. Remove approx. 10 cm (4 in) of the cable mantle, strip approx.
1 cm (0.4 in) of insulation from the ends of the individual wires
5. Insert the cable into the sensor through the cable entry
25
5 Connecting to power supply
Fig. 14: Connection steps 5 and 6 - Single chamber housing
26
Fig. 15: Connection steps 5 and 6 - Double chamber housing
6. Insert the wire ends into the terminals according to the wiring plan
Information:
Solid cores as well as exible cores with wire 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 freed. When the screwdriver is released, the
terminal closes again.
You can nd further information on the max. wire cross-section under
"Technical data/Electromechanical data"
7. Check the hold of the wires in the terminals by lightly pulling on
them
8. Connect the screen to the internal ground terminal, connect the
outer ground terminal to potential equalisation
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
41824-EN-130612
2
2
Electronics and connection compartment
5 Connecting to power supply
9. Tighten the compression nut of the cable entry. The seal ring must
completely encircle the cable
10. Reinsert the display and adjustment module, if one was installed
11. Screw the housing cover back on
The electrical connection is hence nished.
5.3 Wiring plan, single chamber housing
The following illustration applies to the non-Ex, Ex-ia and Ex-d ver-
sion.
Electronics compartment
+
( )
4...20mA
1
(-)
2
5
678
3
4
1
Fig. 16: Electronics and connection compartment, single chamber housing
1 Voltage supply, signal output
2 For display and adjustment module or interface adapter
3 For external display and adjustment unit
4 Ground terminal for connection of the cable screen
5.4 Wiring plan, double chamber housing
The following illustrations apply to the non-Ex as well as to the Ex-ia
version.
4...20mA
( )
+
(-)
1
2
Fig. 17: Electronics compartment, double chamber housing
1 Internal connection to the connection compartment
2 For display and adjustment module or interface adapter
567
11
8
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
27
5 Connecting to power supply
2
Connection compartment
Connection compartment
- Radio module PLICSMOBILE
4...20mA
+
( )
(-)
1
2
5
678
3
4
1
Fig. 18: Connection compartment, double chamber housing
1 Voltage supply, signal output
2 For display and adjustment module or interface adapter
3 For external display and adjustment unit
4 Ground terminal for connection of the cable screen
Information:
The use of an external display and adjustment unit and a display and
adjustment module in parallel in the connection compartment is not
supported.
Status
SIM-Card
Test
Bus
( )
+
(-)
1
2
USB
1
Fig. 19: Connection compartment radio module PLICSMOBILE
1 Voltage supply
You can nd detailed information on connection in the supplementary
instructions "PLICSMOBILE GSM/GPRS radio module".
28
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VEGAFLEX 81 • 4 … 20 mA/HART two-wire
2
Electronics compartment
Connection compartment
5 Connecting to power supply
5.5 Wiring plan, Ex-d-ia double chamber housing
4...20mA
+
( )
(-)
1
2
Fig. 20: Electronics compartment, double chamber housing
1 Internal connection to the connection compartment
2 For display and adjustment module or interface adapter
3 Internal connection to the plug connector for external display and adjust-
ment unit (optional)
Note:
If an instrument with Ex-d-ia approval is used, HART multidrop operation is not possible.
567
31
8
Fig. 21: Connection compartment, Ex-d double chamber housing
1 Voltage supply, signal output
2 Ground terminal for connection of the cable screen
41824-EN-130612
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
4...20mA
+
( )
(-)
1
2
2
1
29
5 Connecting to power supply
DIS-ADAPT with plug
connector M12 x 1 for
external display and
adjustment unit
1
2
3
Fig. 22: View to the electronics compartment
1 DIS-ADAPT
2 Internal plug connection
3 Plug connector M12 x 1
34
Wire assignment, connection cable
1
Fig. 23: Top view of the plug connector
1 Pin 1
2 Pin 2
3 Pin 3
4 Pin 4
Contact pin Colour connection ca-
ble in the sensor
Pin 1 Brown 5
Pin 2 White 6
Pin 3 Blue 7
Pin 4 Black 8
2
Terminal, electronics
module
5.6 Wiring plan - version IP 66/IP 68, 1 bar
1
2
Fig.24:Wireassignmentx-connectedconnectioncable
1 brown (+) and blue (-) to power supply or to the processing system
2 Shielding
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VEGAFLEX 81 • 4 … 20 mA/HART two-wire
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