Vega VEGAMET 381 Ex Guida utente

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

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

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

SFF DC

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

VEGAMET 381 Ex•4…20 mAsignal conditioning instruments 7

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)

Fig.2:Structure of application 2

1Current input and processing electronics

2Relay 1

3Relay 2

4Actors

SFF DC

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)

SFF DC

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

SFF DC

0FIT 11 FIT 386 FIT 54 FIT 88 %0%88 %

Current output

VEGAMET 381 Ex•4…20 mAsignal conditioning instruments 9

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

Fig.5:Time-dependent process of PFD

AVG

1PFD

AVG

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

10 VEGAMET 381 Ex•4…20 mAsignal conditioning instruments

3Safety-related characteristics

39686-EN-110930

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