VEGA TROL20Ex User Manual
VEGATROL 20 Ex
VEGATOR 526W Ex
on
TIB • Technical Information • Operating Instructions
Fail safe overfill
protection for
pressurized vessels
storing liquid gas
Approved acc. to the
VdTÜV-information
"Overfill protection" 100
no. TÜV.ÜS.94-35
liquid gas PN 25
Corresponds to the
requirements to
component tested overfill
protections of TRB 801,
no. 25
Corresponds to the
requirements of
DIN V 19250 AK 5
Conformity certificates
PTB-no. Ex-94.C.4035 X
BVS-no. 93.C.2015 X
VEGA Grieshaber KG
Electronic level measurement
Am Hohenstein 113
Postfach 11 42
D-77757 Schiltach/Schwarzwald
Phone 0 78 36 / 50 - 0
Fax 0 78 36 / 50 201
Contents
1 Introduction
1.1 Contents of the instruction manual ..................................................................................................................... 3
1.2 Safety information ...............................................................................................................................................3
1.3 Approvals ............................................................................................................................................................3
2 Technical Information
2.1 Product description .............................................................................................................................................4
2.2 Configuration of an overfill protection ................................................................................................................. 5
2.3 Configuration of a measuring system .................................................................................................................6
2.3.1 Continuous level measurement ...............................................................................................................6
2.3.2 Additional switch point .............................................................................................................................6
2.4 Technical data ..................................................................................................................................................... 7
2.4.1 Signal conditioning instrument VEGATOR 526 W Ex ..............................................................................7
2.4.2 Sensor VEGASWING Ex with oscillator E86 Ex (overfill protection) .......................................................8
2.4.3 Capacitive measuring electrodes.............................................................................................................9
2.4.4 Housing of the system sensor ................................................................................................................. 9
2.5 Dimensional drawings ....................................................................................................................................... 10
2.5.1 VEGATROL 20 system sensor .............................................................................................................. 10
2.5.2 Flanges .................................................................................................................................................. 11
2.5.3 Signal conditioning instrument VEGATOR 526 W Ex ............................................................................ 11
2.6 Electrical connection ......................................................................................................................................... 12
2.6.1 Signal conditioning instrument VEGATOR 526 W Ex overfill protection ................................................ 12
2.6.2 VEGATROL 20 system sensor .............................................................................................................. 13
2.7 Mounting instructions and regulations .............................................................................................................. 14
2.8 Connection examples for overvoltage arresters ............................................................................................... 15
Contents
3 Mounting and set-up
3.1 Mounting ........................................................................................................................................................... 16
3.2 Set-up................................................................................................................................................................16
3.3 Operation .......................................................................................................................................................... 17
4 Supplement
4.1 Fault signals ...................................................................................................................................................... 17
4.2 Calculation information for sensor length..........................................................................................................18
4.3 General instructions for the use of overfill protections ...................................................................................... 19
2
VEGATROL 20 Ex
1 Introduction
1 Introduction
1.1 Contents of the instruction manual
This Technical Information / Operating Instructions
(T.I.B.) contains information for correct
- installation
- connection
- set-up
for the fail-safe-protectionVEGATROL 20 Ex .
This TIB is supplied as part of the order. Knowledge of the
contents is important for correct operation of the
instrument. This TIB accompanies the product and is
addressed to technical staff which are trained or have
knowledge of the use of level measurement and control
equipment.
1.2 Safety information
The instrument must only be operated as described in this
TIB. Please note that other action can cause damage for
which VEGA does not take liability.
1.3 Approvals
VdTÜV
VEGATROL 20 is approved acc. to VdTÜV-information
"Overfill protection" 100 as overfill protection in stationary
storage vessels in liquid gas plants of groups A, B, C and
D (approval no. TÜV.ÜS.94-35).
This approval is also valid for storage vessels in
distribution plants.
DIN
The overfill protection of VEGATROL 20 corresponds to
the requirements of DIN V 19250, class 5.
TRB
VEGATROL 20 corresponds to the requirements on
component tested overfill protections acc. to TRB 801,
no. 25.
Overfill protection in vessels up from group C
Also in cases where TRB 801, no. 25, item 6.1.4.2
requires two independent overfill protections,
VEGATROL 20 is sufficient to meet with this requirement.
one
Ex-Zone 1
The system sensor of VEGATROL 20 is approved for the
use in hazardous areas zone 1. In such cases the
regulations and special conditions of the conformity
certificate PTB-no. Ex-94.C.4035 X and BVS-no.
93.C.2015 X must be observed.
If the capacitive measuring electrode of the system sensor
is used as part of a continuous level measurement or level
detection, the oscillator of the measuring electrode must
be supplied via a suitable intrinsically safe circuit of a
separate signal conditioning instrument.
These are the following possibilities:
- signal conditioning instrument VEGAMET in Ex-version
- signal conditioning instrument VEGAMET or evaluation
system VEGALOG with safety barrier
- signal conditioning instrument VEGATOR in Ex-version
- signal conditioning instrument VEGATOR with safety
barrier.
The regulations and special conditions of the conformity
certificates of the signal conditioning instruments or the
safety barrier must furthermore be observed.
Possible combinations of measuring systems are stated
on page 6.
VEGATROL 20 Ex
3
2 Technical Information
2 T echnical Information
2.1 Product description
General
VEGATROL 20 for liquid gas consists of:
- VEGATROL 20 system sensor
- signal conditioning instrument VEGATOR 526 W Ex.
System sensor VEGATROL 20 includes in the concentric
tube the vibrating probe VEGASWING as well as
additionally a capacitive measuring electrode either as rod
or cable electrode.
The oscillators for VEGASWING as well as the measuring
electrode are also integrated in the housing of the system
sensor.
The vibrating level switch in conjunction with VEGATOR
526 W Ex is used as overfill protection.
The capacitive measuring electrode can be used as
follows:
- in conjunction with a signal conditioning instrument
VEGAMET for continuous level measurement
- in conjunction with a signal conditioning instrument
VEGATOR for an additional switch point (e.g.
operational switch-off acc. to VdTÜV).
These signal conditioning instruments are not part of
VEGATROL 20 and have to be ordered separately.
The continuous level measurement as well as the additional level detection are realized via the integral capacitive
measuring electrode. This electrode in conjunction with
the concentric tube or the metallic container wall forms a
capacitor. The liquid gas acts as dielectricum and changes
therefore the capacitance of this capacitor. The respective
oscillator converts the capacitance into a level proportional
direct current. The measuring range includes the total
length of the rod or cable electrode, measured from the
end of the VEGASWING.
The detected level can be used to realize an additional
switch point, e.g. an operational switch off point.
Fail-safe / Self-monitoring
A special feature of the overfill protection of VEGATROL
20 is the integral self-monitoring. It is based on a redundant microprocessor system in the signal conditioning
instrument and includes the whole measuring chain from
the tuning fork via the oscillator, the two-wire line as well
as the signal conditioning instrument.
The self-monitoring includes two routines:
- the permanent monitoring
- the cyclical self-test.
The application range comprises stationary vessels acc. to
the pressure vessel regulations for storing liquid gas acc.
to DIN 51 622:
- in individual vessel plants
- in liquid gas plants
- in distribution plants
- in plants with several vessels
each of group A, B, C and D.
When use in distribution plants up from group C min.
separate overfill protections must be installed acc. to the
requirement of TRB 801, no. 25. Even in these cases
VEGATROL 20 is sufficient due to the VdTÜV-approval to
meet with the TRB-requirement.
In plants with several vessels VEGATROL 20 can be used
as continuous monitoring and locking systems.
two
one
Function
The level is detected by a vibrating level switch
VEGASWING. Its tuning fork is piezoelectrically energized
and vibrates at its mechanical resonance frequency. A
second piezoelectric element measures this resonance
frequency. If the tuning fork is covered by the liquid gas,
the resonance frequency changes proportional to the
degree of covering. The oscillator in VEGASWING detects
continuously the resonance frequency and converts the
value into a current to the signal conditioning instrument.
When the switch point is reached an erratic increase of the
current signal is triggered. The level relay in the signal
conditioning instrument de-energizes.
During the permanent monitoring the signal conditioning
instrument causes the oscillator of the sensor to trigger a
test cycle in 960 msec. cycle. Defined test signals are
transmitted via the two-wire line to the signal conditioning
instrument. Possible failures in the sensor electronics as
well as line break, short-circuit and mechanical damage on
the tuning fork are signalled via these test signals.
During the cyclical selftest security relevant components
and procedures (e.g. level relay, CPU, memory, time
reaction) are checked in the signal conditioning instrument
in a very tough time pattern. The function test of the level
relays is made without interruption of the circuit of
connected systems.
If during the self-monitoring a failure is detected, the level
relays and the fail safe relay de-energize.
Due to the above mentioned measures a reliable and
correct function of the overfill protection is ensured without
any staff involved for control tasks.
4
VEGATROL 20 Ex
2 Technical Information
2.2 Configuration of an overfill protection
Storage vessels in liquid gas plants of group A, B, C and D
The overfill protection VEGATROL 20 for a storage vessel consists of:
- VEGATROL 20 system sensor with rod and cable electrode
- signal conditioning instrument VEGATOR 526 W Ex.
Additional instruments:
- signal conditioning instrument VEGAMET for continuous level measurement or for additional switch point
- overvoltage arresters etc. acc. to the requirements of the system.
Version I: cylindrical tank
Ex-Zone 1
e.g. rod electrode
Version II: spherical tank
VEGATROL 20
System sensor
Ex-Zone 1
e.g. cable
z.B. Seil-
electrode
elektrode
VEGATROL 20
System sensor
two-wire
line each
(intrinsically safe
circuit)
two-wire
line each
(intrinsically safe
VEGAMET Ex
0/4 … 20 mA
VEGATOR 526 W Ex
•
•
•
•
•
VEGATOR 526 W Ex
VEGATOR 526 W Ex
on
DISBUS
!
!
circuit)
Not-Ex-area
VEGAMET Ex
0/4 … 20 mA
VEGATOR 526 W Ex
•
•
•
•
•
VEGATOR 526 W Ex
VEGATOR 526 W Ex
on
Continuous level
measurement
Overfill
protection
DISBUS
!
!
Continuous level
measurement
Overfill
protection
VEGATROL 20 Ex
Not-Ex-area
5
2 T echnical Information
2.3 Configuration of a measuring system
2.3.1 Continuous level measurement
Sensor VEGATROL 20 VEGATROL 20 VEGATROL 20
1
2
Ex-area
Not Ex-area
Safety barrier 145 145 145 145
Signal conditioning VEGAMET VEGAMET VEGALOG 571
instrument 509 Z Ex 512 Z EA-card (input analog)
1
10
Outputs
Relay 3 x 3 x 10 x per AR-card (output relay)
Current 1 x 3 x 10 x per AA-card (output analog)
DISBUS 1 x 1 x for max. 30 VEGADIS per AD-card (output DISBUS)
2.3.2 Additional switch point
Sensor VEGATROL 20 VEGATROL 20
1
Ex-area
Not Ex-area
Safety barrier 145 145 145
Signal conditioning VEGATOR VEGALOG 571
instrument 525 F EA-card (input analog)
10
Outputs
Relay 1 x 10 x per AR-card (output relay)
Additional instruments for measuring systems - Overvoltage arresters
- Indicators VEGADIS 171 A / 172 (0 … 20 mA)
- VEGADIS 173 (DISBUS)
- Interface converters VEGACOM 557
6
VEGATROL 20 Ex
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