Operating Instructions
Capacitive electrodes EL
4 … 20 mA - Compact
Level and Pressure
Safety information
Safety information
Please read this manual carefully, and also take
note of country-specific installation standards
(e.g. the VDE regulations in Germany) as well
as all prevailing safety regulations and accident
prevention rules.
For safety and warranty reasons, any internal
work on the instruments, apart from that involved
in normal installation and electrical connection,
must be carried out only by qualified VEGA personnel.
2 Capacitive electrodes EL 4 … 20 mA - Compact
Note Ex area
Please note the attached safety instructions containing important information on installation and
operation in Ex areas.
These safety instructions are part of the operating instructions manual and come with the Ex
approved instruments.
22652-EN-020809
Contents
Contents
Safety information ......................................................................... 2
Note Ex area ................................................................................. 2
1 Product description
1.1 Function and configuration ................................................... 4
1.2 Types and versions .............................................................. 5
1.3 Technical data ....................................................................... 7
1.4 Approvals ........................................................................... 13
1.5 Dimensions ......................................................................... 14
1.6 Type plate ........................................................................... 16
2 Mounting
2.1 Mounting instructions ......................................................... 17
3 Electrical connection
3.1 Connection instructions ...................................................... 22
3.2 Wiring plan .......................................................................... 22
4 Setup
4.1 General adjustment ............................................................ 26
4.2 Adjustment - Oscillators
CAP E32 Ex and CAP E32 H Ex ........................................ 27
4.3 Adjustment with VVO .......................................................... 30
4.4 Adjustment with HART® handheld ...................................... 31
5 Diagnosis
5.1 Simulation ............................................................................ 38
5.2 Maintenance ........................................................................ 38
5.3 Repair .................................................................................. 38
5.4 Fault rectification ................................................................. 39
22652-EN-020809
Capacitive electrodes EL 4 … 20 mA - Compact 3
1 Product description
Product description
1.1 Function and configuration
Capacitive electrodes series EL can detect
the level of practically any kind of product,
regardless of whether it is a liquid, powder or
paste. This also applies to adhesive products.
The electrode simultaneously measures the
capacitance and the ohmic resistance (admittance processing). By this means, even difficult products such as adhesive, conductive
substances and solids with fluctuating moisture content can be measured.
Through the use of screening tubes and
screening segments, inactive areas can be
created on the probe where pollution, condensation or permanent buildup cannot influence
the measuring result.
Measuring principle
Electrode, medium and vessel wall form an
electrical capacitor.
The capacitance of the capacitor is generally
influenced by three factors:
- distance between electrode surfaces (a)
- size of the electrode surfaces (b)
- type of dielectric between the electrodes (c)
a
The electrode and the vessel wall are the
capacitor surfaces. The medium is the dielectric. Due to the higher dielectric constant (DK
value) of the medium with respect to air, the
capacitance of the capacitor increases as the
level rises around the electrode.
Fig. 1.2 Capacitance change through varying
immersion level
The capacitance change is processed by the
oscillator and converted into a level-proportional measured value. The measured value is
outputted as a standardised, floating
4 … 20 mA analogue signal, or optionally as a
digital signal with the HART® communication
protocol. The sensor can be adjusted through
the integrated oscillator. As an option, adjustment is also possible with a HART® handheld
or PC.
In continuous level measurement, the level is
b
continuously detected and converted into a
level-proportional signal which is either directly
displayed or further processed.
c
Fig. 1.1 Plate capacitor (schematic drawing)
For this type of measurement, you need a
capacitive electrode series EL with oscillator
CAP E32 Ex or CAP E32 H Ex.
Continuous measurement requires a constant
dielectric value ε
unchanging properties.
4 Capacitive electrodes EL 4 … 20 mA - Compact
i.e. the medium should have
r
22652-EN-020809
Product description
1.2 Types and versions
Version 11*)21*)24*
Type EL EL EL EL EL EL EL EL EL
)
29 31*
)
33 42*
)
52 53
Level detection • ••••••••
Continuous • ••••••••
Partly insulated • • •
Fully insulated • • • • • •
Oscillators
CAP E32 EX • ••••••••
CAP E32 H EX • ••••••••
Approvals
ATEX II 2G EEx ia IIC T6 • • • •
ATEX II 1G,1/2G,
EEx ia IIC T6 • • • • •
ATEX II 1/2D IP65 T
7)
••
Overfill protection WHG • •••• •
German Lloyd
Lloyds Register of Ship
American Bureau of Ship
Bureau Veritas
RINA
1)
1)
1)
1)
•••••••••
•••••••••
1)
•••••••••
•••••••••
•••••••••
Process fitting
1½ NPT •• ••••••
G1½A ••• •••••
Tri-Clamp 1½“ • • • •
Tri-Clamp 2“ • • • • •
Bolting
DN 50 • • • • •
Flange • • • • • • • •
Flange plated •
Screwed adapter
PP •• ••
PTFE • • • •
Electrode material
Steel • • • • • • •
2)
2)
2)
3)
3)
4)
Stainless steel •
•
•
•
•
•
2)
•
*) also Ex0
1) applied for
22652-EN-020809
2) 1.4435
3) 1.4571
4) 1.4401
5) For electrodes certified for Ex-Zone 0, only PTFE and FEP are approved as insulation materials.
6) Level detection with signal conditioning instrument possible
7) only with Aluminium housing
Capacitive electrodes EL 4 … 20 mA - Compact 5
2)
•
Product description
Version 11*)21*)24*)29 31*)33 42*)52 53
Type EL EL EL EL EL EL EL EL EL
Insulation material
5)
PTFE • • • • • •
PP • •
PE/PA 12 •
PFA •
FEP • •
PE •
Screening tube
Steel • •
Stainless steel (1.4435) • •
Screening tube (option)
Steel •• •••••
Stainless steel • • • • • • •
Temperature adapter
(option)
Steel • • • • •
Stainless steel (1.4435) • • • • •
PA • • • • • • •
Housing material
Plastic •••••••••
Aluminium •••••••••
Misc.
6)
Adapter
•• • ••
Overvoltage protect. option
CB-2-36 (integrated) • • • • • • • • •
Overvoltage arrester
Angled electrode
7)
8)
••• •••••
9)
••
*) also Ex 0
1) applied for
2) 1.4435
3) 1.4571
4) 1.4401
5) For electrodes certified for Ex-Zone 0, only PTFE and FEP are certified as insulation materials.
6) For combustible liquids in pressurised vessels, e.g. liquid gas, ammonia
7) For high electrostatic discharge, e.g. plastic granules
8) Bending max. 90°
9) EL 21 only in PTFE with 3.2 mm insulation thickness
6 Capacitive electrodes EL 4 … 20 mA - Compact
22652-EN-020809
Product description
1.3 Technical data
Housing
Housing material plastic PBT (Polyester) or Aluminium
Protection
- plastic housing IP 66
- Aluminium housing IP 66/67 (meets requirements of both protection
Cable entry 1 piece M20 x 1.5
Terminals for max. 1.5 mm2 wire cross-section
Mechanical connection
Material galvanized steel (St 37), 1.4571 (stst), Aluminium
Thread G 1
Flange flange versions
Electrode
Material
- EL 11 1.4435 (316 L)
- EL 21 steel (St 37)
- EL 31 1.4401 (316 L)
- EL 24, 42 1.4571 (316 L)
Length
- r od max. 3 m
- cable max. 20 m
Insulation see "Insulation materials"
Max. tensile load (cable)
- EL 31 20 KN
- EL 33, 34, 52, 53 15 KN
plastic-coated
types)
1/
A or 1
2
1/
" NPT
2
Ambient conditions
Ambient temperature on the housing -40°C … +80°C
Product temperature see "Product temperature and operating
pressure"
Storage and transport temperature -40°C … +80°C
Operating pressure see "Product temperature and operating
pressure"
22652-EN-020809
Capacitive electrodes EL 4 … 20 mA - Compact 7
Oscillators CAP E32 Ex, CAP E32 H Ex
Protection class II
Overvoltage category III
Frequency 300 KHz
Capacitance ranges 0 … 3000 pF
Supply voltage 12 … 36 V DC
in Ex applications note the permissible electrical
connection values stated in the certificate
Permissible residual ripple USS less or equal 1 V
Potential separation min. 500 V DC
Load in
Ohm
1000
800
600
Product description
200
12
18 24 30 36
Supply voltage
in V
Accessory
Fixing spring of 1.4571
- length approx. 185 mm (stressed)
- tensile force approx. 200 N
Weight
Basic weight (e.g. EL 24) approx. 0.8 kg
Rod weight ø 6 mm - 0.23 kg/m
ø 10 mm - 0.62 kg/m
Oscillators in two-wire technology for capacitive electrodes EL
T y pe App licat ion Meas. range Freq uency Signal condit.
CAP E32 Compact electronics 4 … 20 mA for 0 - 3000 pF 300 KHz not necessary
Ex continuous level measurement,
acc. to the principle of phaseselective admittance processing.
Parameter adjustment via key pushing
on the oscillator
CAP E32 Compact electronics 4 … 20 mA for 0 - 3000 pF 300 KHz not necessary
HEx continuous level measurement,
acc. to the principle of phaseselective admittance processing.
Parameter adjustment via key pushing
on the oscillator, VVO from V. 2.30 or
HART® handheld
instrument
8 Capacitive electrodes EL 4 … 20 mA - Compact
22652-EN-020809
Product description
Oscillator
The oscillator CAP E32 (H) Ex with patented
processing (phase-selective admittance
processing) extends the area of application of
capacitive level measurement technology. This
function can be switched on, see 4 Setup.
In conjunction with a fully insulated rod electrode, the oscillator also compensates heavy
conductive buildup.
Mounted with any rod or cable electrode type
EL, this oscillator also enables exact measurement of solids with varying moisture content.
The oscillator processes the measuring currents acc. to their phase position. Measuring
currents with a defined phase shift, commonly
occurring when buildup forms or moisture
content changes, are hence filtered out.
Varying moisture content
A change of moisture content in solids causes
a change of the dielectric constant (er). A
simultaneous change of the ohmic resistance
of the product also occurs. In addition, the
change causes a phase shift of the measuring
currents.
If the moisture content goes above 15 % vol.,
the fully and partly insulated electrodes react
differently (see also „Fig. 1.3 Varying moisture
content“). Whereas the measured value from
fully insulated electrodes increases with unchanging product level, the measured value
from partly insulated electrodes falls.
Level
Meas.
value
+
1)
–
0 %
1) Real value level
5 %
15 % vol.
10 %
fully insulated
electrode
Solid
moisture (%)
partly insulated electrode
Fig. 1.3 Varying moisture content
With capacitive measurement, even minor
changes of moisture content cause measurement errors. Typical products are e.g. sand,
aggregate in the cement industry, hops or
plastic granules (after drying).
When using oscillator CAP E32 (H) Ex,
changes of moisture content up to 15 % vol.
do not influence the accuracy of the measurement. Even layers containing different
amounts of moisture do not affect the accuracy.
22652-EN-020809
Capacitive electrodes EL 4 … 20 mA - Compact 9
Product description
Product temperature1) and operating
pressure
1)
The numbers in the tables all relate to the
graphs on this page. The stated pressures
are valid for screw connections G 1½ A,
1½ NPT and R 1½. Boltings DN 50 acc. to
DIN 11 851 only up to max. 25 bar. When
using flanged versions, make sure to note
their nominal pressure. All electrodes are also
suitable for applications in a vacuum (-1 bar).
For electrodes certified for Ex-Zone 0, only
PTFE and FEP are approved as insulating
materials.
Process fitting, 1.4571
Insulation
Electrode type
PE
PP
PTFE
PE/PA12
PFA
FEP
EL 11 - 1 3 - - -
EL 21 1-3-3-
EL 21 (flange) - - 2 - - -
EL 24 - - - - - 2
EL 29 - - 2 - - -
EL 31 - 1 3 - - -
EL 33 - - 3 - - -
EL 42 - - 2 - - -
EL 52 - - 3 - - -
EL 53 - - - 1 - -
Process fitting, steel (St 37)
Insulation
Electrode type
EL 11 -46---
EL 21 4-6-6-
EL 21 (flange) - - 5 - - -
EL 24 -----5
EL 31 -46---
EL 33 --6---
EL 42 --5---
EL 52 --6---
EL 53 ---4--
PE
PP
PTFE
PE/PA 12
PFA
FEP
bar
40
16
0
-30
bar
63
40
16
-50 100
0
bar
63
40
25
0-50 100
bar
40
16
0
-10
bar
63
40
16
0-10 100
bar
63
25
0
-10
60 80
60 80
˚C
˚C
100
˚C
Temperature
adapter
˚C
Temperature
adapter
EL 53:
PE and PE / PA 12:
up to 16 bar
11
1
EL 53:
PE and PE / PA 12:
up to 16 bar
EL 34: unpressurised
EL 42:
up to 16 bar
EL 24:
up to 40 bar
max. 150°C for
30 min.
EL 42:
up to 16 bar
EL 24:
up to 40 bar
max. 150°C for
30 min.
2)
11
22
2
22
33
3
33
200 ˚C
1)
44
4
44
55
5
55
66
6
66
˚C
200
1)
Temperature adapter of PA up to 150°C, from 100°C
unpressurised
10 Capacitive electrodes EL 4 … 20 mA - Compact
22652-EN-020809
Product description
Process fitting, Aluminium
Insulation
Electrode type
EL 11 - 7 8 - -
EL 21 7 - 8 - 8
EL 31 - 7 8 - -
EL 33 - - 8 - -
EL 42 - - 8 - -
EL 52 - - 8 - -
EL 53 - - - 7 -
PE
PP
PTFE
PE/PA 12
Process fitting, plastic
(screw adapter)
Insulation
PVC
PP
Electrode type
EL 29 9 9 9
PTFE
PFA
77
bar
16
0
-30
bar
40
0
-20
60 80
bar
16
0-50 100
60
80
˚C
˚C
PVC, PP: unpressurised
up to 80°C
PTFE: 3 bar, -20 … 100°C
˚C
100
7
77
88
8
88
99
9
99
22652-EN-020809
1)
For Ex applications, the permissible temperatures and pressures stated in the certificate must be noted. Please
observe the table on the following page.
2)
Temperature adapter of PA up to 150°C, from 100°C unpressurised
Capacitive electrodes EL 4 … 20 mA - Compact 11
Electronics temperature
Product and ambient temperatures must be
kept at levels that do not exceed the limit
temperature of the electronics.
Temperature classes T4 (or no Ex)
Without temperature adapter
- product temperature -40°C … +135°C
- ambient temperature
1)
-40°C … +90°C
Temperature class T3
Product description
With temperature adapter
Plastic housing Metal housing
Product temperature -40°C … 180°C 200°C 150°C 175°C 200°C
Ambient temperature
1)
-40°C … 80°C 75°C 80°C 69°C 58°C
1) Ambient temperature on the oscillator
12 Capacitive electrodes EL 4 … 20 mA - Compact
22652-EN-020809
Product description
1.4 Approvals
Explosion protection
Only certified capacitive electrodes EL** Ex 0
may be used in hazardous areas with combustible gases, vapours or fog.
Capacitive electrodes EL** Ex 0 are suitable
for use in hazardous areas of zone 1 and
zone 0.
The explosion protection provided by these
instruments is certified by the EC type approval and the conformity certificate, possibly
with national zone 0 annex, issued by the
approval authority. These documents are
generally attached to the instruments.
When the capacitive electrodes are mounted
and operated in hazardous areas, the Ex
installation regulations must be noted.
The information and regulations in the supplied certificates (EC type approval certificate,
conformity certificate) of the capacitive electrodes as well as of the accompanying devices (signal conditioning instrument,
separator, safety barrier) must be noted.
• As a rule, the installation of Ex systems
must be carried out only by qualified personnel.
• The capacitive electrodes must be powered
from an intrinsically safe circuit; the permissible electrical values are stated in the
accompanying certificate.
• Capacitive electrodes with electrostatically
chargeable plastic parts come with a warning label informing of measures to be taken
to avoid the dangers of electrostatic discharges. Note the information on the warning label.
• The explosion protection of the instrument
used is only ensured when the limit temperatures stated in the certificate are not
exceeded.
• In case of danger due to oscillation or vibration, the appropriate parts of the capacitive
electrodes must be protected.
• After shortening the electrode cable, make
sure the gravity weight is sufficiently se-
22652-EN-020809
cured by means of the pins.
Overfill protection acc. to WHG
The statements and regulations of the attached type approvals must be noted if a
capacitive electrode is used as part of an
overfill protection system for vessels storing
water-endangering liquids. The general type
approval must be available at the application
site.
Electrodes must only be used in liquids
against which the materials of the wetted parts
are sufficiently chemically resistant.
Ship approvals
For use on ships, type approval certificates
are available from several ship classification
authorities (GL, LRS, ABS, BV, RINA).
CE approval
The capacitive electrodes EL meet the protective regulations of EMC (89/336/EWG) and
NSR (72/23/EWG). Conformity has been
judged acc. to the following standards:
EMC Emission EN 50 081 - 1
Susceptibility EN 50 082 - 2
NSR EN 61 010 - 1
Zone 2
According to DIN VDE 0165, instruments can
be used in hazardous areas of zone 2 without
approval; they must meet the requirements in
section 6.3 of this VDE. The compliance of the
instruments with these requirements is confirmed by VEGA in a manufacturer declaration.
Capacitive electrodes EL 4 … 20 mA - Compact 13
1.5 Dimensions
Dimensions of capacitive electrode type EL … Ex 0
Type EL 11 (partly insulated)
(Ex 0)
85
32,5
Type EL 21 (fully insulated)
(Ex 0)
85
32,5
Product description
Type EL 24 (fully insulated,
for adhesive products)
(Ex 0)
85
32,5
110
20
35
L1
L (min. 100/max. 4000 mm)
M20x1,5
SW 60
G 1½ A
Ø 20
Ø 15
Insulation length L1:
PP: 100 mm
PTFE: 50 mm
StEx: max. 100 mm
L (min. 100 mm, max. 4000 mm)
Type EL 29 (fully
insulated)
85
32,5
15825L (min. 100/max. 4000 mm)
M20x1,5
110
20
35
L (min. 100/max. 4000 mm)
M20x1,5
SW 60
G 1½ A
A
L (min. 100 mm, max. 4000 mm)
Type EL 31 (partly insulated)
85
(Ex 0)
110
20
35
Ø 20
32,5
M20x1,5
SW 60
L1
G 1½ A
Ø 8
110
20
35
L (min. 120/max. 4000 mm)
M20x1,5
SW 60
G 1½ A
Ø 12
Ø 14
L (min. 120 mm, max. 4000 mm)
Insulation A
PE 2.0 mm 20 mm
PTFE 2.0 mm 2 0 mm
PTFE 3.2 mm 1 6 mm
PFA 2.0 mm 20 mm
outer-ø
Type EL 42 (fully insulated)
(Ex 0)
85
32,5
110
20
35
Ø 5
M20x1,5
SW 60
G 1½ A
Ø 14
48
L (min. 120, max. 3000 mm)
L (min. 400/max. 25.000 mm)
200
Ø 40
16
70
L (min. 400 mm, max. 25000 mm)
Insulation length L1:
PP: 100 mm
PTFE: 50 mm
StEx: max. 100 mm
100
L (min. 400/max. 25.000 mm)
200
Ø 40
L (min. 400 mm, max. 25000 mm)
Ø 3
Ø 3
120
Ø 20
Ø 36
Ø 40
14 Capacitive electrodes EL 4 … 20 mA - Compact
22652-EN-020809
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