Directed Electronics 3100 Instruções de Operação descarregar pdf (Página 33)

11 % Diagnosis coverage DC

= λ

/(λ

+ λ

)

82 % Diagnosis coverage DC

= λ

/(λ

+ λ

)

Diagnosis

Diagnosis test period 100 sec

MTBF = MTTF + MTTR 1.59x10

max. useful life of the measuring system for the safety

function

approx. 10 years

Single channel architecture

SIL2 (Safety Integrity Level)

HFT = 0 (Hardware Fault Tolerance)

Mode switch is set to "max"

PFD

avg

Proof

= 1 year

Proof

= 5 years

Proof

= 10 years

< 0. 008 x 10

-2

< 0. 039 x 10

-2

< 0. 077 x 10

-2

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. 016 x 10

-2

< 0. 078 x 10

-2

< 0. 156 x 10

-2

PFH [1/h] <3.6 x 10

-8

SIL2 (Safety Integrity Level)

HFT = 0 (Hardware Fault Tolerance)

Mode switch is set to "max"

PFD

avg

Proof

= 1 year

Proof

= 5 years

Proof

= 10 years

< 0. 019 x 10

-2

< 0. 093 x 10

-2

< 0. 186 x 10

-2

PFH [1/h] < 4. 3 x 10

-8

Mode switch is set to "min"

Genera l data

Architecture 1 oo1D - Overﬁll

protection

Architecture 1 oo1D - Dry run

protection

Functional safety

OPTISWITCH 3100 C - with two-wire output 33

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