Directed Electronics 3100 Instrucciones de operaciones descargar pdf (Pagina 34)

PFD

avg

Proof

= 1 year

Proof

= 5 years

Proof

= 10 years

< 0. 016 x 10

-2

< 0. 081 x 10

-2

< 0. 162 x 10

-2

PFH [1/h] < 3. 7 x 10

-8

Double channel architecture

Here you see an example how the measuring system in double

channel architecture can be used in an application with

demand rate SIL3. ACommon Cause Factor of beta = 10 %

(worst case) is taken into account.

If the instruments are used in another (multiple channel)

architecture, the values must be calculated for the selected

application by means of the above failure rates.

SIL3 (Safety Integrity Level)

HFT = 1 (Hardware Fault Tolerance)

Mode switch is set to "max"

PFD

avg

Proof

= 1 year

Proof

= 5 years

Proof

= 10 years

< 0. 007 x 10

-3

< 0. 036 x 10

-3

< 0. 073 x 10

-3

PFH [1/h] < 1. 8 x 10

-8

Mode switch is set to "min"

PFD

avg

Proof

= 1 year

Proof

= 5 years

Proof

= 10 years

< 0. 015 x 10

-3

< 0. 076 x 10

-3

< 0. 153 x 10

-3

PFH [1/h] < 2. 0 x 10

-8

SIL3 (Safety Integrity Level)

HFT = 1 (Hardware Fault Tolerance)

Mode switch is set to "max"

PFD

avg

Proof

= 1 year

Proof

= 5 years

Proof

= 10 years

< 0. 018 x 10

-3

< 0. 091 x 10

-3

< 0. 184 x 10

-3

PFH [1/h] < 2. 3 x 10

-8

Mode switch is set to "min"

Architecture 1 oo2D - Overﬁll

protection

Architecture 1 oo2D - Dry run

protection

Functional safety

34 OPTISWITCH 310 0 C - with two-wire output

29955-EN-060112

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