VEGA VEGABAR 80 User Manual

Safety Manual

VEGABAR series 80

Two-wire 4 … 20 mA/HART and Secondary sensors

With SIL qualification

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

4.1Characteristics 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

4.3Characteristics acc. to ISO 13849-1 for process pressure measurement or hydrostatic

	4.4	level measurement ..........................................................................................................	10
		Characteristics acc. to ISO 13849 - 1 for applications with Secondary sensor ..................	11
	4.5	Supplementary information .............................................................................................	12
5	Setup	........................................................................................................................................General information	13
	5.1		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 definitions		19
10	Supplement ..............................................................................................C: SIL conformity		20

	Editing status: 2020-12-18
2	VEGABAR series 80 • Two-wire 4 … 20 mA/HART

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			1 Document language
	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.

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VEGABAR series 80 • Two-wire 4 … 20 mA/HART

3

2 Scope

2 Scope

2.1Instrument 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 qualification

•Two-wire 4 … 20 mA/HART with SIL qualification and supplementary electronics "Additional current output 4 … 20 mA"

•Secondary electronics for electronic differential pressure with SIL qualification

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!

2.2Application area

The pressure transmitter can be used in a safety-related system according to IEC 61508 in the modes low demand mode or high demand mode for the measurement of the following process variables:

•Process pressure measurement

•Hydrostatic level measurement

With Secondary sensor:

•Differential 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)

1)	Only with instrument version with supplementary electronics "Additional cur-
	rent output 4 … 20 mA".
4	VEGABAR series 80 • Two-wire 4 … 20 mA/HART

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2 Scope

2.3SIL conformity

The SIL confirmity was judged and certified independently by TÜV Rheinland according to IEC 61508:2010 (Ed.2) (verification documents see " Supplement").

The certificate is valid for the entire service life of all instruments that were sold before the certificate expired!

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VEGABAR series 80 • Two-wire 4 … 20 mA/HART

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3 Planning

	3	Planning
	3.1 Safety function
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 defined limit value of the process variable
	•	Falling below a defined limit value of the process variable
	•	Monitoring of a defined range of the process variable
Safety tolerance	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 devi-
	•	ates 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)

Safe state

Fault signals in case of malfunction

Instructions and restrictions

6

3.2Safe state

The safe state of the current output depends on the safety function and the characteristics set on the sensor.

Character-	Monitoring upper limit val-	Monitoring lower limit value
istics	ue
4 … 20 mA	Output current ≥ Switching	Output current ≤ Switching
	point	point
20 … 4 mA	Output current ≤ Switching	Output current ≥ Switching
	point	point

Possible fault currents:

•≤ 3.6 mA ("fail low")

•> 21 mA ("fail high")

3.3Prerequisites for operation

•The measuring system should be used appropriately taking pressure, temperature, density and chemical properties of the medium into account.The application-specific limits must be observed.

•The specifications according to the operating instructions manual, particularly the current load on the output circuits, must be kept within the specified 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", paragraph " Supplementary information" must be noted

•All parts of the measuring chain must correspond to the planned "

Safety Integrity Level (SIL)"

VEGABAR series 80 • Two-wire 4 … 20 mA/HART

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4 Safety-related characteristics

4 Safety-related characteristics

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

VEGABAR 82, 83, 86, 87

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

	λS	λDD		λDU			λH	λL		λAD
	0 FIT	1121 FIT		44 FIT			9 FIT	59 FIT		34 FIT
	PFDAVG			0.037 x 10-2				(T1 = 1 year)
	PFDAVG			0.054 x 10-2				(T1 = 2 years)
	PFDAVG			0.106 x 10-2				(T1 = 5 years)
	PFH			0.044 x 10-6 1/h
Proof Test Coverag (PTC)
	Test type 5)		Remaining failure rate of danger-							PTC
			ous undetected failures
	Test 1				21 FIT					52 %
	Test 2				2 FIT					95 %
VEGABAR 81
	Parameter				Value
	Safety Integrity Level				SIL2 in single-channel architecture
					SIL3 in multiple channel architecture 6)
	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)Homogeneous redundancy possible, because systematic capability SC3.

VEGABAR series 80 • Two-wire 4 … 20 mA/HART

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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

λS	λDD	λDU		λH		λL		λAD
0 FIT	981 FIT	77 FIT		9 FIT	59 FIT			34 FIT
PFDAVG		0.065 x 10-2			(T1	= 1 year)
PFDAVG		0.096 x 10-2			(T1	= 2 years)
PFDAVG		0.188 x 10-2			(T1	= 5 years)
PFH		0.077 x 10-6 1/h

Proof Test Coverag (PTC)

Test type 9)	Remaining failure rate of danger-	PTC
	ous undetected failures
Test 1	56 FIT	28 %
Test 2	2 FIT	97 %

Device combination consisting of VEGABAR 82, 83, 86 or 87

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

Parameter	Value
Safety Integrity Level	SIL2 in single-channel architecture
	SIL3 in multiple channel architecture 10)
Hardware fault tolerance	HFT = 0
Instrument type	Type B
Mode	Low demand mode, High demand mode
SFF	> 90 %
MTBF 11)	0.39 x 106 h (44 years)
Diagnostic test interval 12)	< 30 min

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.

VEGABAR series 80 • Two-wire 4 … 20 mA/HART

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