Vega VEGACAP 27 User manual

Operating Instructions
VEGACAP 27
-double relay (DPDT)
Capacitive

Contents
1About this document
1.1Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2Target group . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3Symbolism used . . . . . . . . . . . . . . . . . . . . . . . 5
2For your safety
2.1Authorised personnel . . . . . . . . . . . . . . . . . . . . 6
2.2Appropriate use. . . . . . . . . . . . . . . . . . . . . . . . 6
2.3Warning about misuse . . . . . . . . . . . . . . . . . . . 6
2.4General safety instructions . . . . . . . . . . . . . . . . 6
2.5Safety approval markings and safety tips . . . . . 7
2.6CE conformity . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7Safety instructions for Ex areas . . . . . . . . . . . . 7
2.8Environmental instructions . . . . . . . . . . . . . . . . 7
3Product description
3.1Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2Principle of operation. . . . . . . . . . . . . . . . . . . . 9
3.3Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4Storage and transport . . . . . . . . . . . . . . . . . . . 11
4Mounting
4.1General instructions. . . . . . . . . . . . . . . . . . . . . 12
4.2Mounting instructions. . . . . . . . . . . . . . . . . . . . 13
5Connecting to power supply
5.1Preparing the connection . . . . . . . . . . . . . . . . . 15
5.2Wiring plan,single chamber housing. . . . . . . . . 15
6Set up
6.1General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2Adjustment elements . . . . . . . . . . . . . . . . . . . . 17
6.3Functional chart. . . . . . . . . . . . . . . . . . . . . . . . 20
7Maintenance and fault rectification
7.1Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.2Remove interferences . . . . . . . . . . . . . . . . . . . 22
7.3Exchange of the electronics module . . . . . . . . . 25
7.4Instrument repair . . . . . . . . . . . . . . . . . . . . . . . 26
8Dismounting
8.1Dismounting steps . . . . . . . . . . . . . . . . . . . . . . 27
8.2Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2VEGACAP 27 - - double relay (DPDT)
Contents
33758-EN-070809

9Supplement
9.1Technical data. . . . . . . . . . . . . . . . . . . . . . . . . 28
9.2Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9.3Industrial property rights. . . . . . . . . . . . . . . . . . 34
9.4Trademark . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Supplementary documentation
Information:
Supplementary documents appropriate to the ordered version
come with the delivery.You can find them listed in chapter
"Product description".
Instructions manuals for accessories and replacement
parts
Tip:
To ensure reliable setup and operation of your VEGACAP 27,
we offer accessories and replacement parts.The associated
documents are:
lOperating instructions manual "Oscillator CAP E31R"
VEGACAP 27 - - double relay (DPDT)3
Contents
33758-EN-070809

1About this document
1.1Function
This operating instructions manual provides all the information
you need for mounting,connection and setup as well as
important instructions for maintenance and fault rectification.
Please read this information before putting the instrument into
operation and keep this manual accessible in the immediate
vicinity of the device.
1.2Target group
This operating instructions manual is directed to trained
personnel.The contents of this manual should be made
available to these personnel and put into practice by them.
1.3Symbolism used
Information,tip,note
This symbol indicates helpful additional information.
Caution:If this warning is ignored,faults or malfunc-
tions 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.
lList
The dot set in front indicates a list with no implied sequence.
àAction
This arrow indicates a single action.
1Sequence
Numbers set in front indicate successive steps in a procedure.
4VEGACAP 27 - - double relay (DPDT)
About this document
33758-EN-070809

2For your safety
2.1Authorised personnel
All operations described in this operating instructions manual
must be carried out only by trained specialist personnel
authorised by the operator.
During work on and with the device the required personal
protection equipment must always be worn.
2.2Appropriate use
VEGACAP 27 is a sensor for level detection.
You can find detailed information on the application range in
chapter "Product description".
Operational reliability is ensured only if the instrument is
properly used according to the specifications in the operating
instructions manual as well as possible supplementary
instructions.
Due to 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 modifications are
explicitly forbidden.
2.3Warning about misuse
Inappropriate or incorrect use of the instrument can give rise to
application-specific hazards,e.g.vessel overfill or damage to
system components through incorrect mounting or adjustment.
2.4General safety instructions
This is a high-tech instrument requiring the strict observance of
standard regulations and guidelines.The user must take note
of the safety instructions in this operating instructions manual,
the country-specific installation standards as well as all
prevailing safety regulations and accident prevention rules.
The instrument must only be operated in a technically flawless
and reliable condition.The operator is responsible for trouble-
free operation of the instrument.
VEGACAP 27 - - double relay (DPDT)5
For your safety
33758-EN-070809

During the entire duration of use,the user is obliged to
determine the compliance of the required occupational safety
measures with the current valid rules and regulations and also
take note of new regulations.
2.5Safety approval markings and safety tips
The safety approval markings and safety tips on the device
must be observed.
2.6CE conformity
VEGACAP 27 is in CE conformity with EMC (89/336/EWG)
and LVD (73/23/EWG).
Conformity has been judged according to the following
standards:
lEMC:
-Emission EN 50081-1:1992
-Suceptibility EN 50082-2:1995
lLVD:EN 61010-1:1993
2.7Safety instructions for Ex areas
Please note the Ex-specific 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.
2.8Environmental 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 man-
agement system is certified according to DIN EN ISO 14001.
Please help us fulfil this obligation by observing the environ-
mental instructions in this manual:
lChapter "Packaging,transport and storage"
lChapter "Disposal"
6VEGACAP 27 - - double relay (DPDT)
For your safety
33758-EN-070809

3Product description
3.1Configuration
The scope of delivery encompasses:
lVEGACAP 27 level sensor
lDocumentation
-this operating instructions manual
-if necessary,further documents
VEGACAP 27 consists of the following components:
lHousing cover
lHousing with electronics
lProcess fitting with electrode
1
2
3
4
5
Fig.1:VEGACAP 27 -with plastic housing
1Housing cover
2Housing with electronics
3Process fitting
4active screen segment
5active probe
The type label contains the most important data for identi-
fication and use of the instrument:
lArticle number
lSerial number
lTechnical data
lArticle numbers,documentation
Scope of delivery
Components
Type label
VEGACAP 27 - - double relay (DPDT)7
Product description
33758-EN-070809

With the serial number,it is possible to show the delivery data
of the instrument via "www.vega.com","VEGA Tools"and
"serial number search".In addition to the type label outside on
the instrument,the serial number is also available inside the
instrument.
3.2Principle of operation
VEGACAP 27 is a level switch with fully insulated,capacitive
electrode with screen segment and active tip for level
detection.
VEGACAP 27 is very rugged and maintenance-free and can
be used in all areas of industrial process technology.
Typical applications are overfill and dry run protection.
Setup of the instrument is very easy because an adjustment is
not necessary.This means that changing products with
different dielectric values,such as e.g.water and oil or
conductive and non-conductive products,do not influence the
settings on the instrument and their switching accuracy.
Fully insulated probes with screen segment like VEGACAP 27
are preferably used in conductive,very adhesive liquids.
Due to the mechanical construction with screen segment and
the active tip,buildup on the probe is compensated.
The capacitive measuring principle places no special require-
ments on installation.Hence,many different applications can
be equipped with VEGACAP 27.
The instrument can also be used problem-free in corrosive
products.
Probe,measured product and vessel wall form an electrical
capacitor.The capacitance is influenced by three main factors.
Area of application
Functional principle
8VEGACAP 27 - - double relay (DPDT)
Product description
33758-EN-070809

1
2
3
Fig.2:Functional principle -Plate capacitor
1Distance between the electrode surfaces
2Size of the electrode surfaces
3Type of dielectric between the electrodes
The probe and the vessel wall are the capacitor plates.The
measured product is the dielectric.Due to the higher dielectric
constant (DK value)of the product compared to air,the
capacitance increases as the probe is gradually covered.
The capacitance change is converted by the oscillator into a
switching command.
VEGACAP 27 is a compact instrument,i.e.it can be operated
without external evaluation system.The integrated electronics
evaluates the level signal and outputs a switching signal.With
this switching signal,a connected device can be operated
directly (e.g.a warning system,aPLC,a pump etc.).
You can find data on voltage supply in chapter "Technical
data"in the "Supplement".
3.3Operation
The probe can be adapted to the dielectric value of the product
directly on the electronics module.
Aswitching command can be triggered when the probe is
covered or laid bare.
On the electronics module you will find the following indicating
and adjustment elements:
lControl lamp for indication of the switching condition
lPotentiometer for switching point adaptation (covered)
lDIL switch for mode adjustment
Supply
VEGACAP 27 - - double relay (DPDT)9
Product description
33758-EN-070809

3.4Storage and transport
Your instrument was protected by packaging during transport.
Its capacity to handle normal loads during transport is assured
by a test according to DIN EN 24180.
The packaging of standard instruments consists of environ-
ment-friendly,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 instruc-
tions can cause damage to the device.
The delivery must be checked for completeness and possible
transit damage immediately at receipt.Ascertained transit
damage or concealed 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:
lNot in the open
lDry and dust free
lNot exposed to corrosive media
lProtected against solar radiation
lAvoiding mechanical shock and vibration
lStorage and transport temperature see "Supplement -
Technical data -Ambient conditions"
lRelative humidity 20 …85 %
Packaging
Transport
Transport inspection
Storage
Storage and transport tem-
perature
10 VEGACAP 27 - - double relay (DPDT)
Product description
33758-EN-070809

4Mounting
4.1General instructions
In general the level switch can be mounted in any position.The
instrument must be mounted in such a way that the probe is at
the height of the requested switching point.
Before beginning with the welding work,remove the oscillator
out of the sensor.By doing this,you avoid damages ont he
electrode due to inductive couplings.
With threaded versions,the housing must not be used to screw
the instrument in!Applying tightening force on the housing can
damage its rotational mechanical parts.
Use the hexagon for screwing in.
Use the recommended cables (see chapter "Connecting to
power supply")and tighten the cable gland.
You can give your VEGACAP 27 additional protection against
moisture penetration by leading the connection cable down-
ward in front of the cable entry.Rain and condensation water
can thus drain off.This applies mainly to outdoor mounting,
areas where high humidity is expected (e.g.from cleaning
processes)or cooled or heated vessels.
Fig.3:Measures against moisture penetration
Do not hold VEGACAP 27 on the probe.Especially with heavy
flange versions or long rod versions,the sensor can be
damaged simply by the weight of the instrument.
Switching point
Welding work
Handling
Moisture
Transport
VEGACAP 27 - - double relay (DPDT)11
Mounting
33758-EN-070809

The process fitting 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 stated in chapter "Technical
data"in the "Supplement"or on the type label of the sensor.
4.2Mounting instructions
Agitators,equipment vibration,etc., can cause the level switch
to be subjected to strong lateral forces.For this reason,do not
use an overly long probe for VEGACAP 27,but check if you
can mount a short level switch on the side of the vessel in
horizontal position.
Extreme vibration caused by the system,e.g.due to agitators
or turbulence in the vessel from fluidisation,can cause the
probe of VEGACAP 27 to vibrate in resonance.If a longer rod
version is necessary,you can secure the probe by fastening a
suitable brace or guy directly above the end of the rod.
IfVEGACAP 27 is mounted in the filling stream,unwanted
erroneous measurements may result.Mount VEGACAP 27 at
a location in the vessel where no disturbing influence from e.g.
filling openings,agitators,etc.can occur.
This applies particularly to instrument versions with a longer
probe.
Pressure/Vacuum
Agitators and fluidization
Inflowing medium
12 VEGACAP 27 - - double relay (DPDT)
Mounting
33758-EN-070809

Fig.4:Inflowing medium
VEGACAP 27 - - double relay (DPDT)13
Mounting
33758-EN-070809

5Connecting to power supply
5.1Preparing the connection
Always keep in mind the following safety instructions:
lConnect only in the complete absence of line voltage
Connect the power supply according to the following diagrams.
Oscillator CAP E31Ris designed in protection class 1.To
maintain this protection class,it is absolutely necessary that
the ground conductor be connected to the internal ground
terminal.Take note of the general installation regulations.As a
rule,connect VEGACAP 27 to vessel ground (PA), or in case
of plastic vessels,to the next ground potential.On the side of
the housing there is a ground terminal between the cable
entries.This connection serves to drain offelectrostatic
charges.
You can find data on voltage supply in chapter "Technical
data"in the "Supplement".
VEGACAP 27 is connected with standard cable with round
cross section.An outer cable diameter of 5…9mm
(0.2…0.35 in)ensures the seal effect of the cable gland.
If cable with a different diameter or wire cross section is used,
exchange the seal or use an appropriate cable connection.
Note:
When placing the housing cover,make sure that the inspection
glass is above the signal lamp of the oscillator.
5.2Wiring plan,single chamber housing
We recommend connecting VEGACAP 27 in such a way that
the switching circuit is open when there is a level signal,line
break or failure (safe condition).
The relays are always shown in non-operative condition.
The two relays (DPDT)work synchronously.Hence it is
possible to control also e.g.a horn and a magnet valve.
Note safety instructions
Select power supply
Selecting connection cable
Wiring plan
14 VEGACAP 27 - - double relay (DPDT)
Connecting to power supply
33758-EN-070809

2 3 4 5 6 7
+
L1
–
N
81
1
2
3
Fig.5:Wiring plan
1Relay output
2Relay output
3Voltage supply
VEGACAP 27 - - double relay (DPDT)15
Connecting to power supply
33758-EN-070809

6Set up
6.1General
The numbers in brackets refer to the following illustrations.
On the electronics module you will find the following indicating
and adjustment elements:
lPotentiometer for switching point adaptation
lDIL switch for mode adjustment -A/B
lControl lamp
Note:
As a rule,always set the mode with the mode switch (5)before
starting setup VEGACAP 27.The switching output will change
if you set the mode switch (5)afterwards.This could possibly
trigger other connected instruments or devices.
6.2Adjustment elements
3
4
5
6
1
2
Fig.6:Oscillator with relay output
1Type label
2Connection terminals
3Tensile proving ring
4Control lamp
5DIL switch for mode adjustment
6Potentiometer for switching point adaptation
Function/Configuration
16 VEGACAP 27 - - double relay (DPDT)
Set up
33758-EN-070809

The switching status of the electronics can be checked with
closed housing (only plastic housing), see "Function chart".
Note:
When placing the housing cover,make sure that the inspection
glass is above the signal lamp (LED)of the oscillator.
To adjust VEGACAP 27,loosen first of all the four screws on
the upper side of the instrument with a screwdriver and remove
the housing cover.
You can adapt the switching point to the solid with the
potentiometer.
The electronics is adjustment free and an adaption is only
necessry in exceptions.See "Exceptions".
With the mode switch you can change the switching condition
of the relay.You can set the required mode (A-max.detection
or overfill protection,B-min.detection or dry run protection).
We recommend connecting according to the quiescent current
principle (relay contact deenergizes when the switching point
is reached), because the relay always takes on the same
(safe)condition if a failure is detected or in case of mains
failure.
Control lamp for indication of the switching condition
lControl lamp on =Relay deenergised
The measuring system is immediately ready for operation.
The switching point must no longer be set with VEGACAP 27.
The probe has an active tip and a screen segment.Thanks to
the screen segment,the so called standing capacitance,
caused by the vessel after installation of the probe,is mainly
compensated.
As a default setting,the oscillator is adjusted to the basic
capacitance of the probe.The relay output switching when the
active tip is covered (active tip:50 …150 mm /2…5.9in)of
the electrode.
Changing dielectric values of the products,such as e.g.
caused in mixing vessels are no problem for the switching
accuracy within the active pin.The selection of the electrode
length is hence very important because the length of the
electrode determines the switching point.This switching point
cannot be shifted on the electrode.
Switching point adaptation (6)
Mode adjustment (5)
Signal lamp (4)
Switching point adjustment
VEGACAP 27 - - double relay (DPDT)17
Set up
33758-EN-070809

In exceptions,e.g.in pipelines or if the probe is mounted very
close to the vessel wall,it can happen ath the probe signals
already overfilling (covering)in uncovered condition.
In this case,the switching point must be re-adjusted.
For adjustment,the vessel must not be filled and the switching
point adjustment is also possible in dismounted condition.
Afresh adjustment is necessary in the following cases:
lfor probes with a length of more than 3m(9.8ft)
lin narrow space installation conditions with high standing
capacitance (e.g.in tubes etc.)
lafter exchange of the oscillator
Proceed as follows for a fresh adjustment:
1Make sure that the probe is uncovered.
2Pierce the cover of the potentiometer (6)with a screw-
driver.
3Turn the below potentiometer (6)first of all anticlockwise
(max.20 turns)until the control lamp signals "covered".
Mode A(overfill protection)=control lamp lights
Mode B(dry run protection)=control lamp extinguishes
If this condition is already reached,you can continue with
the next step.
4Turn the potentiometer (6)very slowly (due to the damping)
clockwise until the control lamp signals "uncovered".
Mode A(overfill protection)=control lamp extinguishes
Mode B(dry run protection)=control lamp lights
5Turn the potentiometer (6)clockwise according to the
following chart.
6The probe is now ready for operation.
Sensitivity
Standard very sensitive
additional turns DK value >2
=2turns
DK value >1.5
=1turn
Tab.1:Number of additional turns for the potentiometer (6)
Note:
With the measurement of products with very low dielectric
values,the number of turns can be reduced up to 1according
to the chart.
Exceptions
Fresh adjustment
18 VEGACAP 27 - - double relay (DPDT)
Set up
33758-EN-070809

This setting is too sensitive with conductive,adhesive
products.
Note:
When placing the housing cover,make sure that the inspection
glass is above the signal lamp of the oscillator.
6.3Functional chart
The following chart provides an overview of the switching
conditions depending on the adjusted mode and level.
Level Switching sta-
tus
Control lamp
Mode A
Overfill protection
53 4
(8)(6) (7)
Relay energized
Mode A
Overfill protection
53 4
(8)(6) (7)
Relay deener-
gized
Mode B
Dry run protection
53 4
(8)(6) (7)
Relay energized
Mode B
Dry run protection
53 4
(8)(6) (7)
Relay deener-
gized
Failure of the
supply voltage
(mode A/B)
any
53 4
(8)(6) (7)
Relay deener-
gized
VEGACAP 27 - - double relay (DPDT)19
Set up
33758-EN-070809

Level Switching sta-
tus
Control lamp
Failure any
53 4
(8)(6) (7)
Relay deener-
gized
20 VEGACAP 27 - - double relay (DPDT)
Set up
33758-EN-070809