Vega VEGASWING 66 Guida utente

Safety Manual

VEGASWING 66

Two-wire (8/16 mA)

With SIL qualication

Document ID: 45309

Contents

VEGASWING 66 • Two-wire (8/16 mA)

45309-EN-130722

Contents

1 Document language

2 Scope

2.1 Instrument version............................................................................................................ 4

2.2 Area of application ........................................................................................................... 4

2.3 SIL conformity .................................................................................................................. 4

3 Planning

3.1 Safety function ................................................................................................................. 5

3.2 Safe state......................................................................................................................... 5

3.3 Prerequisites for operation ............................................................................................... 5

4 Safety-related characteristics

4.1 Parameter according to IEC 61508................................................................................... 7

4.2 Figures according to ISO 13849-1.................................................................................... 7

4.3 Supplementary information .............................................................................................. 7

5 Setup

5.1 General information.......................................................................................................... 9

5.2 Instrument parameter adjustment..................................................................................... 9

6 Diagnostics and service

6.1 Behaviour in case of failure ............................................................................................ 10

6.2 Repair ............................................................................................................................ 10

7 Proof test

7.1 General information........................................................................................................ 11

7.2 Test1-withoutllingordismountingthesensor ............................................................ 11

7.3 Test2-withllingordismountingofthesensor ............................................................. 12

8 Appendix A - Test report

9 AppendixB-Te r m denitions

10 Supplement C - SIL conformity

Editing status: 2013-07-22

1 Document language

VEGASWING 66 • Two-wire (8/16 mA)

45309-EN-130722

1 Document language

DE Das vorliegende Safety Manual für Funktionale Sicherheit ist verfügbar in den Sprachen

Deutsch, Englisch, Französisch und Russisch.

EN The current Safety Manual for Functional Safety is available in German, English, French and

Russian language.

FR Le présent Safety Manual de sécurité fonctionnelle est disponible dans les langues suivantes:

allemand, anglais, français et russe.

RU ДанноеруководствопофункциональнойбезопасностиSafety Manualимеетсяна

немецком,английском,французскомирусскомязыках.

2 Scope

VEGASWING 66 • Two-wire (8/16 mA)

45309-EN-130722

2 Scope

2.1 Instrument version

This safety manual applies to point level sensors

VEGASWING 66 - Two-wire (8/16 mA)withSILqualication

Electronics module:

•SG60HT-L

Valid versions:

•from HW Ver 1.0.0

•from SW Ver 1.1.0

The version "remote housing" is excluded!

Permissible version of VEGATOR 636:

•from HW Ver 1.0.1

2.2 Area of application

The instrument can be used for level detection of liquids in a safety-

related system according to IEC 61508 in the modes low demand

mode or high demand mode:

•Up to SIL2 in a single-channel architecture

•Up to SIL3 in a multiple-channel architecture

The following interface should be used to output the measured value:

•Two-wire current output 8/16 mA

2.3 SIL conformity

TheSILconformitywasindependentlyjudgedandcertiedbythe

TÜV Rheinland according to IEC 61508:2010 (Ed.2).1)

Thecerticateisvalidfortheentireservicelifeofallinstrumentsthat

weresoldbeforethecerticateexpired!

Operation with

VEGATOR 636 signal

conditioning instrument

1) Verication documents see appendix

3 Planning

VEGASWING 66 • Two-wire (8/16 mA)

45309-EN-130722

3 Planning

3.1 Safety function

To monitor a limit level, the sensor detects via the conditions "Vibrat-

ing element uncovered" or "Vibrating element covered" a limiting

valuedenedbythemountinglocation.

The determined status is signalled at the output with "Current = 8 mA"

or "Current = 16 mA".

3.2 Safe state

The safe status of the output signal is independent of the mode

adjusted on the sensor.

Mode Overowprotection

(mode max.)

Dry run protection

(mode min.)

Vibrating element covered uncovered

Output current 16 mA ±1.5 mA 16 mA ±1.5 mA

When operating with a signal conditioning instrument VEGATOR 636

or VEGATOR series 100 max. mode must be adjusted on the sen-

sor. The selection of the mode is carried out on the signal condition-

ing instrument.

Mode Overowprotection

(mode max.)

Dry run protection

(mode min.)

Vibrating element covered uncovered

Output current 16 mA ±1.5 mA 8mA ±1.5 mA

The safe status of the output signal is independent of the mode evalu-

ated by an SPLC.

Mode Overowprotection Dry run protection

Vibrating element covered uncovered

Output current when mode

on the sensor is set to

"max."

16 mA ±1.5 mA 8mA ±1.5 mA

Output current when mode

on the sensor is set to

"min."

8mA ±1.5 mA 16 mA ±1.5 mA

Possible fault currents:

•≤3.6mA("faillow")

•> 21 mA ("fail high")

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maintained.

Safety function

Safe condition when

selecting the mode on the

sensor

Safe condition when

operating with a signal

conditioning instrument

Safe condition when op-

erating with an SPLC

Output signals in case of

malfunction

Instructions and restric-

tions

3 Planning

VEGASWING 66 • Two-wire (8/16 mA)

45309-EN-130722

•Thespecicationsaccordingtotheoperatinginstructionsmanual,

particularly the current load of the output circuits, must be kept

withinthespeciedlimits

•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)"

4 Safety-related characteristics

VEGASWING 66 • Two-wire (8/16 mA)

45309-EN-130722

4 Safety-related characteristics

4.1 Parameter according to IEC 61508

Parameter Value

Safety Integrity Level SIL2 in single-channel architecture

SIL3 in multiple channel architecture2)

Hardware error tolerance HFT = 0

Instrument type Type B

Mode Low demand mode, High demand mode

SFF > 90 %

MTTR 8 h

MTBF = MTTF + MTTR3) 1.25 x106 h (143 years)

Diagnosis test interval4) < 120 s

Fault reaction time5) < 2 s

Failure rates

λSλDD λDU λHλLλAD λAU

0 FIT 307 FIT 29 FIT 3 FIT 81 FIT 11 FIT 8 FIT

PFDAVG 0.025 x10-2 (T1 = 1 year)

PFDAVG 0.036 x10-2 (T1 = 2 years)

PFDAVG 0.071 x10-2 (T1 = 5 years)

PFH 0.029 x10-6 1/h

4.2 Figures according to ISO 13849-1

Derived from the safety-related characteristics, there are the following

guresaccordingtoISO13849-1(machinesafety):6)

Parameter Value

MTTFd 265 years

DC 93 %

Performance Level 2.95 x10-8 1/h (corresponds to "e")

4.3 Supplementary information

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.

Determination of the

failure rates

2) Homogeneous redundancy possible

3) Including errors outside the safety function

4) Time during which all internal diagnoses are carried out at least once

5) Time between the occurrence of the event and the output of a fault signal.

6) ISO 13849-1 was not part of the certication of the instrument.

4 Safety-related characteristics

VEGASWING 66 • Two-wire (8/16 mA)

45309-EN-130722

Allguresrefertoanaverageambienttemperatureof40°C(104°F)

during the operating time. For higher temperatures, the values should

be corrected:

•Continuousapplicationtemperature>50°C(122°F)byfactor1.3

•Continuousapplicationtemperature>60°C(140°F)byfactor2.5

Similarfactorsapplyiffrequenttemperatureuctationsareexpected.

•The failure rates are constant. Take note of the useful life of the

components according to IEC 61508-2.

•Multiple errors are not taken into account

•Wear on mechanical parts is not taken into account

•Failure rates of external power supplies are not taken into account

•The environmental conditions correspond to an average industrial

environment

The values for PFDAVGspeciedabovewerecalculatedasfollowsfora

1oo1 architecture:

PFDAVG= +λDD x MTTR +

PTC × λ

× T1

(1 – PTC) ×

× LT

•T1 (Proof Test Interval)

•MTTR = 8 h

•PTC = 90 %

•LT = 10 years

A connected control and processing unit must have the following

properties:

•The output circuit of the transmitter is judged according to the

quiescent current principle

•"fail low" and "fail high" signals are interpreted as a failure, which

triggers a fault message

If this is not the case, the respective percentages of the failure rates

must be assigned to the dangerous failures and the values stated in

chapter Safety-related characteristics“ redetermined!

In multiple channel systems for SIL3 applications, this measuring sys-

temcanalsobeusedinahomogeneouslyredundantconguration.

The safety-related characteristics must be calculated especially for

the selected structure of the measuring chain using the stated failure

rates. In doing this, a suitable Common Cause Factor must be consid-

ered (see IEC 61508-6, appendix D).

Assumptions of the

FMEDA

Calculation of PFDAVG

Boundary conditions re-

latingtotheconguration

of the processing unit

Multiple channel archi-

tecture

5 Setup

VEGASWING 66 • Two-wire (8/16 mA)

45309-EN-130722

5 Setup

5.1 General information

Take note of the mounting and installation instructions of the operating

instructions manual.

5.2 Instrument parameter adjustment

The following adjustment elements are used to parameterize the

safety function:

•Slide switch for changeover of the mode (min./max.)

•Slide switch for changeover of the sensitivity

The function of the adjustment elements is described in the operating

instructions manual.

When operating with a signal conditioning instrument VEGATOR 636

or VEGATOR series 100 max. mode must be adjusted on the sen-

sor. The selection of the mode is carried out on the signal condition-

ing instrument.

During parameter adjustment, the safety function must be considered

as unreliable!

If necessary, you must take other measures to maintain the safety

function.

The sensor must be protected against inadvertent or unauthorized

modication!

Mounting and installation

Adjustment elements

Operation with a signal

conditioning instrument

Instructions

6 Diagnostics and service

VEGASWING 66 • Two-wire (8/16 mA)

45309-EN-130722

6 Diagnostics and service

6.1 Behaviour in case of failure

If a malfunction is detected, the respective output signals change to

safe condition (see section "Safe condition").

This condition is maintained for at least 1 second. If an error is no

longer detected, the safety function is performed correctly again.

Thediagnosisintervalisspeciedinchapter"Safety-related charac-

teristics".

6.2 Repair

If faults are detected, the entire measuring system must be shut down

and the process held in a safe state by other measures.

The manufacturer must be informed of the occurrence of a danger-

ous, undetected error (incl. fault description).

The procedure is described in the operating instructions manual. Note

the instructions for parameter adjustment and setup.

Internal diagnosis

Reaction when malfunc-

tions occur

Electronics exchange

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