Vega VEGAMET 381 Ex User guide

Safety Manual
VEGAMET 381 Ex
4…20 mAsignal conditioning instruments
Document ID:
39686
Signal
conditioning instruments
and communication

Contents
1Scope
1.1Instrument version .......................... 4
1.2Application area ............................ 4
1.3SIL conformity ............................. 4
2Planning
2.1Safety function ............................. 5
2.2Safe state ................................ 5
2.3Prerequisites for operation .................... 5
3Safety-related characteristics
3.1General figures for all applications............... 7
3.2Specificfigures for application 1................ 7
3.3Specificfigures for application 2................ 8
3.4Specificfigures for application 3................ 8
3.5Specificfigures for application 4................ 9
3.6Supplementary information .................... 10
4Set up
4.1Instrument parameter adjustment................ 12
4.2Mounting and installation...................... 12
5Reaction during operation and in case of failure
5.1General information ......................... 13
5.2Temporal behaviour in case of failure ............ 13
6Recurring function test
6.1General information ......................... 14
6.2Test application 1-One relay output ............. 15
6.3Test application 2-Two relay outputs for range
monitoring ................................ 15
6.4Test application 3-Two redundant relay outputs . . . . 16
6.5Test application 4-Current output............... 16
6.6Calculation realy switching points and output current .16
7Supplement A-Test protocol function test
8Supplement B-Explanations of terms
9Supplement C-SIL conformity
2VEGAMET 381 Ex•4…20 mAsignal conditioning instruments
1Contents
39686-EN-110930

DE
EN
FR
ES
Das vorliegende Safety Manual fürFunktionale Sicherheit ist verfügbar in den Sprachen
Deutsch,Englisch,Französisch und Spanisch.
The current Safety Manual for Functional Safety is available in German,English,French and
Spanish language.
Le présent Safety Manual de sécurité fonctionnelle est disponible dans les langues suivantes:
allemand,anglais,français et espagnol.
El presente Safety Manual para seguridad funcional está disponible en los idiomas alemán,
inglés,francés y español.
CZ Pokud nastanou potíže při čteníbezpečnostních upozorněnív otištěných jazycích,poskytneme.
Vám na základě žádosti k dispozici kopii v jazyce Vaší země.
DA Hvis De har svært ved at forstå sikkerhedsforskrifterne på de trykte sprog,kan.De få en kopi på
Deres sprog,hvis Deønsker det.
EL Εάν δυσκολεύεστε να διαβάσετετις υποδείξειςασφαλείας στιςγλώσσεςπου ήδη έχουν
τυπωθεί,τότεσε περίπτωση ζήτησηςμπορούμε να θέσουμε στη διάθεσή σας ένα αντίγραφο
αυτώνστη γλώσσατης χώρας σας.
ET Kui teil on raskusi trükitud keeltes ohutusnõuete lugemisega,siis saadame me teie
järelepärimise peale nende koopia teie riigi keeles.
FI Laitteen mukana on erikielisiä turvallisuusohjeita.Voit tilata meiltä äidinkieliset turvallisuusohjeet,
jos et selviä mukana olevilla kielillä.
HU Ha a biztonági előírásokat a kinyomtatott nyelveken nem tudja megfelelően elolvasni,akkor
lépjen velünk kapcsolatba:azonnal a rendelkezésére bocsátunk egy példányt az Ön országában
használt nyelven.
IT Se le Normative di sicurezza sono stampate in una lingua di difficile comprensione,potete
richiederne una copia nella lingua del vostro paese.
LT Jei Jums sunku suprasti saugos nuorodųtekstą pateiktomis kalbomis,kreipkitėsįmus ir mes
Jums duosime kopiją Jūsų šalies kalba.
LV JaJums ir problēmas drošības noteikumus lasīt nodrukātajās valodās,tad mēs Jums sniegsim
pēc pieprasījuma kopiju Jūsu valsts valodā.
MT F’kaz li jkollok xi diffikulta`biex tifhem listruzzjonijiet ta’sigurta`kif ipprovduti,infurmana u ahna
nibghatulek kopja billingwa tieghek.
NL Als u moeilijkheden mocht hebben met het lezen van de veiligheidsinstructies in de afgedrukte
talen,sturen wij u op aanvraag graag een kopie toe in uw eigen taal.
PL W przypadku trudności odczytania przepisów bezpiecze stwa pracy w wydrukowanych
językach,chętnie udostępnimy Pastwu kopięw języku obowiązującym w danym kraju.
PT Caso tenha dificuldade de ler as instruções de segurança no idioma,no elas foram impressas,
poderá solicitar junto a nós uma cópia em seu idioma.
SK Pokiaľnastanúproblémy pri čítaníbezpečnostných pokynov vo vydaných jazykoch,poskytneme
Vám na základe žiadosti k dispozícii kópiu v jazyku Vašej krajiny.
SL Kadar se pojavijo težave pri branju varnostnih navodil v izdanih jezikih,vam bomo na osnovi
zahtevka dali na razpolago kopijo v jeziku vaše države.
SV Om du har problem att läsa säkerhetsanvisningarna på de här tryckta språken,ställer vi gärna på
begäran en kopia på ditt språk till förfogande.
VEGAMET 381 Ex•4…20 mAsignal conditioning instruments 3
1Contents
39686-EN-110930

1Scope
1.1Instrument version
This safety manual applies to the signal conditioning instrument
VEGAMET 381 Exin SIL version.
Valid version:
lInstrument serial number >19992538
lInstrument software from Rev.1.20.0
1.2Application area
In combination with a 4…20 mAtransmitter,the signal conditioning
instrument can be used as measuring system for measurement of
level,limit level and other process variables meeting the special
requirements of safety technology.
Due to the service proven reliability according to IEC 61511-1,section
11.4.4,this is possible in a protective function up to SIL2.
The following interfaces can be used:
l4…20 mAsensor input with transmitter power supply
lTwo relay outputs for limit value monitoring
l4…20 mAcurrent output
Note:
For the sensor input,only the mode Sensor Input 4…20 mAactive is
permitted!
For the current output,only the characteristics 4…20 mAis permitted!
1.3SIL conformity
The SIL conformity is confirmed by the verification documents in the
appendix.
4VEGAMET 381 Ex•4…20 mAsignal conditioning instruments
1Scope
39686-EN-110930

2Planning
2.1Safety function
The transmitter powered by the signal conditioning instrument
generates a signal between 3.8and 20.5mAwhich is proportional to
the process variable.
Safety function relay output
Dependent on this analogue signal and the adjusted switching points,
one or two relays for limit value monitoring will be switched.
Safety function current output
This analogue signal can be also fed to a connected processing unit
(e.g.safety-oriented PLC). The set switching points can be used for
limit value monitoring.
The safety accouracy of the output signals is ±2%relating to the
complete value range of 16.7mA(3.8…20.5mA).
2.2Safe state
Safe condition relay output
The safe condition on the relay output is the opened closing contact.
For the sagety function only the closing contact (NO contact)must be
used (closed circuit principle).
Safe condition current output
The safe state of the current output depends on the mode and the
characteristics adjusted on the sensor.
Monitoring upper limit
value
Monitoring lower limit
value
Rising characteristics:
4mA=0%;
20 mA=100 %
Output current >Switch-
ing point -334 µA
Output current <Switch-
ing point +334 µA
Falling characteristics:
20 mA=0%;
4mA=100 %
Output current <Switch-
ing point +334 µA
Output current >Switch-
ing point -334 µA
Relay output
lClosing contact is open
Current output
l"fail low" ≤ 3.6mA
l"fail high" > 21 mA
2.3Prerequisites for operation
lThe measuring system should suit the application.The applica-
tion-specific limits must be maintained
Safety accuracy
Output signals in failure
mode
General instructions and
restrictions
VEGAMET 381 Ex•4…20 mAsignal conditioning instruments 5
2Planning
39686-EN-110930

lThe specifications according to the operating instructions manual,
particularly the current load of the output circuits,must be kept
within the specified limits
lExisting communication interfaces (e.g.HART,USB)are not used
for transmission of the safety-relevant measured value
lThe instructions in chapter "Safety-technical characteristics",
paragraph "Supplementary information"must be noted
lAll parts of the measuring chain must correspond to the planned
"Safety Integrity Level (SIL)"
6VEGAMET 381 Ex•4…20 mAsignal conditioning instruments
2Planning
39686-EN-110930

3Safety-related characteristics
3.1General figures for all applications
Parameter according to
IEC 61508
Value
Safety Integrity Level SIL2
Hardware frequency toler-
ance
HFT =0
Instrument type Type B
Mode Low demand mode/High demand mode
MTTR 8h
MTBF =MTTF +MTTR1)1.05 x10
6
h(120 years)
3.2Specificfigures for application 1
One relay to control an actor for monitoring a limits value (e.g.overfill
or dry run protection)
(3) (3)
(1) (2)
VEGAMET
Fig.1:Structure of application 1
1Current input and processing electronics
2Relay 1or relay 2
3Actor
λ
SD
λ
SU
λ
DD
λ
DU
SFF DC
S
DC
D
0FIT 280 FIT 131 FIT 79 FIT 84 %0%63 %
PFD
AVG
(T1=1year)0.034 x10
-2
PFD
AVG
(T1=5years)0.172 x10
-2
PFD
AVG
(T1=10 years)0.344 x10
-2
PFH [h-1]0.079 x10
-6
Diagnosis test period <4s
1)MTBF:Including errors outside the safety function
One relay output
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3Safety-related characteristics
39686-EN-110930

3.3Specificfigures for application 2
Two relays for control of two actors for monitoring two limit values (e.g.
range monitoring).
(1)
(2)
(3)
VEGAMET
(4)
(4)
Fig.2:Structure of application 2
1Current input and processing electronics
2Relay 1
3Relay 2
4Actors
λ
SD
λ
SU
λ
DD
λ
DU
SFF DC
S
DC
D
0FIT 309 FIT 131 FIT 106 FIT 81 %0%55 %
PFD
AVG
(T1=1year)0.046 x10
-2
PFD
AVG
(T1=5years)0.231 x10
-2
PFD
AVG
(T1=10 years)0.463 x10
-2
PFH [h-1]0.106 x10
-6
Diagnosis test period <4s
3.4Specificfigures for application 3
Two redundantly connected relays for control of an actor for monitoring
a limit value.
Note:The closing contacts of the two relays are connected in series.
Both relay switching points have the same setting.
Two relay outputs
Two relay outputs,re-
dundantly connected
8VEGAMET 381 Ex•4…20 mAsignal conditioning instruments
3Safety-related characteristics
39686-EN-110930

(1)
(2)
(3)
VEGAMET
(4) (4)
Fig.3:Structure of application 3
1Current input and processing electronics
2Relay 1
3Relay 2
4Actors (redundant)
λ
SD
λ
SU
λ
DD
λ
DU
SFF DC
S
DC
D
0FIT 334 FIT 156 FIT 55 FIT 90 %0%74 %
PFD
AVG
(T1=1year)0.024 x10
-2
PFD
AVG
(T1=5years)0.120 x10
-2
PFD
AVG
(T1=10 years)0.240 x10
-2
PFH [h-1]0.055 x10
-6
Diagnosis test period <4s
3.5Specificfigures for application 4
One current output for control of a connected processing units (e.g.a
SPLC).
(1)
VEGAMET
4 ... 20mA
(2)
(3)
Fig.4:Structure of application 4
1Current input and processing electronics
2Current output
3Connected processing unit
λ
SD
λ
SU
λ
DD
λ
DU
SFF DC
S
DC
D
0FIT 11 FIT 386 FIT 54 FIT 88 %0%88 %
Current output
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3Safety-related characteristics
39686-EN-110930

PFD
AVG
(T1=1year)0.024 x10
-2
PFD
AVG
(T1=5years)0.118 x10
-2
PFD
AVG
(T1=10 years)0.237 x10
-2
PFH [h-1]0.054 x10
-6
Diagnosis test period <4s
3.6Supplementary information
The chronological sequence of PFD
AVG
is nearly linear to the
operating time over a period up to 10 years.The above values apply
only to the T1interval after which a recurring function test must be
carried out.
1 5 10 TProof
PFDavg
1
2
3
4
Fig.5:Time-dependent process of PFD
AVG
1PFD
AVG
=0
2PFD
AVG
after 1year
3PFD
AVG
after 5years
4PFD
AVG
after 10 years
(for values see the charts shown above)
The failure rates of the instrument were determined by an FMEDA
according to IEC 61508.Basis for the calculations are the component
failure rates according to SN 29500.
All figures refer to an average ambient temperature during the
operating time of 40 °C(104 °F). For higher temperatures,the values
should be corrected:
lPermanent application temperature >50 °C(122 °F)by factor 1.3
lPermanent application temperature >60 °C(140 °F)by factor 2.5
Similar factors apply if frequent temperature fluctations are expected.
lThe failure rates are constant.Take note of the useful life of the
components according to IEC 61508-2.
Time-dependent proc-
ess of PFD
AVG
Determination of the
failure rates
Assumptions of the
FMEDA
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