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VEGABAR 80
User Manual
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VEGA VEGABAR 80 User Manual

Safety Manual
VEGABAR series 80
Two-wire 4 … 20 mA/HART
and Secondary sensors
With SIL qualication
Document ID: 48369
Contents
Contents
1 Document language ................................................................................................................ 3
2 Scope ........................................................................................................................................ 4
2.1 Instrument version ............................................................................................................ 4
2.2 Application area ............................................................................................................... 4
2.3 SIL conformity .................................................................................................................. 5
3 Planning .................................................................................................................................... 6
3.1 Safety function ................................................................................................................. 6
3.2 Safe state ......................................................................................................................... 6
3.3 Prerequisites for operation ............................................................................................... 6
4 Safety-related characteristics................................................................................................. 7
4.1 Characteristics acc. to IEC 61508 for process pressure measurement or hydrostatic level
measurement ................................................................................................................... 7
4.2 Characteristics acc. to IEC 61508 for applications with Secondary sensor ...................... 8
4.3 Characteristics acc. to ISO 13849-1 for process pressure measurement or hydrostatic
level measurement ......................................................................................................... 10
4.4 Characteristics acc. to ISO 13849-1 for applications with Secondary sensor ................. 11
4.5 Supplementary information ............................................................................................ 12
5 Setup ....................................................................................................................................... 13
5.1 General information ........................................................................................................ 13
5.2 Instrument parameter adjustment ................................................................................... 13
6 Diagnostics and servicing .................................................................................................... 15
6.1 Behaviour in case of failure ............................................................................................ 15
6.2 Repair ............................................................................................................................ 15
7 Proof test ................................................................................................................................ 16
7.1 General information ........................................................................................................ 16
7.2 Test 1: Without checking the process variable ................................................................ 16
7.3 Test 2: With check of the process variable ...................................................................... 17
8 Appendix A: Test report ......................................................................................................... 18
9 AppendixB:Termdenitions ................................................................................................ 19
10 Supplement C: SIL conformity .............................................................................................. 20
48369-EN-210114
Editing status: 2020-12-18
2

1 Document language

1 Document language
DE Das vorliegende Safety Manual für Funktionale Sicherheit ist verfügbar in den Sprachen
EN The current Safety Manual for Functional Safety is available in German, English, French and
FR Le présent Safety Manual de sécurité fonctionnelle est disponible dans les langues suivantes:
RU Данное руководство по функциональной безопасности Safety Manual имеется на
Deutsch, Englisch, Französisch und Russisch.
Russian language.
allemand, anglais, français et russe.
немецком, английском, французском и русском языках.
48369-EN-210114
3

2 Scope

2 Scope

2.1 Instrument version

This safety manual applies to pressure transmitters
VEGABAR 81, 82, 83, 86, 87
VEGABAR 81, 82, 83, 86, 87 Secondary-Sensor
Electronics types:
Two-wire 4 … 20 mA/HART with SIL qualication
•
Two-wire 4 … 20 mA/HART with SIL qualication and supplemen-
•
tary electronics "Additional current output 4 … 20 mA"
Secondary electronics for electronic dierential pressure with SIL
•
qualication
Valid versions:
from HW Ver 1.0.0
•
from SW Ver 1.0.0
•
Secondary electronics from HW Ver 1.0.0
•
The climate-compensated versions are excluded from safety-relevant applications!

2.2 Application area

The pressure transmitter can be used in a safety-related system according to IEC 61508 in the modes low demand mode or high de- mand mode for the measurement of the following process variables:
Process pressure measurement
•
Hydrostatic level measurement
•
With Secondary sensor:
Dierential pressure measurement
•
Flow measurement
•
Density measurement
•
Interface measurement
•
Due to the systematic capability SC3 this is possible up to:
SIL2 in single-channel architecture
•
SIL3 in multiple channel architecture
•
The following interface can be used to output the measured value:
Current output: 4 … 20 mA
•
The following interfaces are only permitted for parameter adjustment and for informative use:
HART
•
Display and adjustment module PLICSCOM (also via Bluetooth)
•
VEGACONNECT (also via Bluetooth)
•
Current output II
•
1)
48369-EN-210114
1)
Only with instrument version with supplementary electronics "Additional cur-
rent output 4 … 20 mA".
4
2 Scope

2.3 SIL conformity

The SIL conrmity was judged and certied independently by TÜV Rheinland according to IEC 61508:2010 (Ed.2) (verication docu- ments see " Supplement").
The certicate is valid for the entire service life of all instruments that were sold before the certicate expired!
48369-EN-210114
5

3 Planning

Safety function
3 Planning

3.1 Safety function

The transmitter generates on its current output a signal between
3.8 mA and 20.5 mA corresponding to the process variable. This analogue signal is fed to a connected processing system to monitor the following conditions:
Exceeding a dened limit value of the process variable
•
Falling below a dened limit value of the process variable
•
Monitoring of a dened range of the process variable
•
Safety tolerance
Safe state
Fault signals in case of malfunction
Instructions and restric­tions
For the design of the safety function, the following aspects must be taken into account with regard to the tolerances:
Due to undetected failures in the range between 3.8 mA and
•
20.5 mA, an incorrect output signal can be generated which devi­ates from the real measured value by up to 2 % Due to the special application conditions, increased measurement
•
deviations can be caused (see Technical data in the operating instructions)

3.2 Safe state

The safe state of the current output depends on the safety function and the characteristics set on the sensor.
Character­istics
4 … 20 mA Output current ≥ Switching
20 … 4 mA Output current ≤ Switching
Possible fault currents:
≤ 3.6 mA ("fail low")
•
> 21 mA ("fail high")
•
Monitoring upper limit val-ueMonitoring lower limit value
point
point
Output current ≤ Switching
point
Output current ≥ Switching
point

3.3 Prerequisites for operation

The measuring system should be used appropriately taking pres-
•
sure, temperature, density and chemical properties of the medium
into account. The application-specic limits must be observed. The specications according to the operating instructions manual,
•
particularly the current load on the output circuits, must be kept
within the specied limits
Existing communication interfaces (e. g. HART, USB) are not used
•
for transmission of the safety-relevant measured value The instructions in chapter " Safety-related characteristics", para-
•
graph " Supplementary information" must be noted All parts of the measuring chain must correspond to the planned "
•
Safety Integrity Level (SIL)"
48369-EN-210114
6
VEGABAR 82, 83, 86, 87

4 Safety-related characteristics

4 Safety-related characteristics

4.1 Characteristics acc. to IEC 61508 for process pressure measurement or hydrostatic level measurement

Parameter Value
Safety Integrity Level SIL2 in single-channel architecture
SIL3 in multiple channel architecture 2)
Hardware fault tolerance HFT = 0
Instrument type Type B
Mode Low demand mode, High demand mode
SFF > 90 %
MTBF 3) 0.50 x 106 h (57 years)
Diagnostic test interval 4) < 30 min
Failure rates
λ
S
0 FIT 1121 FIT 44 FIT 9 FIT 59 FIT 34 FIT
λ
DD
λ
DU
λ
H
λ
L
λ
AD
PFD
AVG
PFD
AVG
PFD
AVG
PFH 0.044 x 10-6 1/h
Proof Test Coverag (PTC)
Test type 5)
Test 1 21 FIT 52 %
Test 2 2 FIT 95 %
VEGABAR 81
Parameter Value
Safety Integrity Level SIL2 in single-channel architecture
Hardware fault tolerance HFT = 0
Instrument type Type B
2)
Homogeneous redundancy possible, because systematic capability SC3.
3)
Including errors outside the safety function.
4)
Time during which all internal diagnoses are carried out at least once.
5)
See section "Proof test".
6)
48369-EN-210114
Homogeneous redundancy possible, because systematic capability SC3.
0.037 x 10
0.054 x 10
0.106 x 10
-2
-2
-2
(T1 = 1 year)
(T1 = 2 years)
(T1 = 5 years)
Remaining failure rate of danger­ous undetected failures
SIL3 in multiple channel architecture 6)
PTC
7
4 Safety-related characteristics
Parameter Value
Mode Low demand mode, High demand mode
SFF > 90 %
MTBF 7) 0.57 x 106 h (65 years)
Diagnostic test interval 8) < 30 min
Failure rates
λ
S
0 FIT 981 FIT 77 FIT 9 FIT 59 FIT 34 FIT
λ
DD
λ
DU
λ
H
λ
L
λ
AD
Device combination con­sisting of VEGABAR 82, 83, 86 or 87
PFD
PFD
PFD
AVG
AVG
AVG
0.065 x 10
0.096 x 10
0.188 x 10
-2
-2
-2
(T1 = 1 year)
(T1 = 2 years)
(T1 = 5 years)
PFH 0.077 x 10-6 1/h
Proof Test Coverag (PTC)
Test type 9)
Test 1 56 FIT 28 %
Test 2 2 FIT 97 %
Remaining failure rate of danger­ous undetected failures
PTC

4.2 Characteristics acc. to IEC 61508 for applications with Secondary sensor

Parameter Value
Safety Integrity Level SIL2 in single-channel architecture
SIL3 in multiple channel architecture
Hardware fault tolerance HFT = 0
Instrument type Type B
Mode Low demand mode, High demand mode
SFF > 90 %
11)
MTBF
0.39 x 106 h (44 years)
Diagnostic test interval
12)
< 30 min
10)
48369-EN-210114
7)
Including errors outside the safety function.
8)
Time during which all internal diagnoses are carried out at least once.
9)
See section "Proof test".
10)
Homogeneous redundancy possible, because systematic capability SC3.
11)
Including errors outside the safety function.
12)
Time during which all internal diagnoses are carried out at least once.
8
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