Siemens SIPART PS2 6DR50xx Instrukcje Operacyjne Pobierz pdf (Strona 227)

Appendix

A.3 Test report (extract)

SIPART PS2 with and without HART communications

Operating Instructions, 09/2007, A5E00074631-07

227

Stephan Aschenbrenner Page 3 of 4

As the Electro-pneumatic Positioner SIPART PS2 is supposed to be a proven-in-use device, an

assessment of the hardware with additional proven-in-use demonstration for the device and its

software was carried out. The proven-in-use investigation was based on field return data

collected and analyzed by SIEMENS AG, A&D PI TQ2. This data cannot cover the process

connection. The proven-in-use justification for the process connection still needs to be done by

the end-user.

According to the requirements of IEC 61511-1 First Edition 2003-01 section 11.4.4 and the

assessment described in section 5.1 the Type B Electro-pneumatic Positioner SIPART PS2 with

a hardware fault tolerance of 0 and a SFF of 60% to < 90% are considered to be suitable for

use in SIL 2 safety functions The decision on the usage of proven-in-use devices, however, is

always with the end-user.

The following tables show how the above stated requirements are fulfilled for the worst case

configuration listed in Table 1.

Table 2: Summary for SIPART PS2 as single-acting shutdow n module – Failure rates

Failure categor y Failure rates (in FIT)

Fail Safe Detected 0

Fail Safe Undetected 919

Fail Dangerous Detected 4

Fail Dangerous Undetected 182

No Effect 93

Annunciation Undetected 1

Not part 76

MTBF = MTTF + MTTR 90 years

Table 3: Summary for SIPART PS2 as single-acting shutdow n module – IEC 61508 failure rates

sd su dd du

SFF DC

0 FIT 1013 FIT 4 FIT 182 FIT 84% 0% 2%

Table 4: Summary for SIPART PS2 as single-acting shutdow n module – PF D

AV G

values

T[Proof] = 1 y ear T[Proof] = 5 y ears T[Proof] = 10 y ears

PF D

AV G

= 7,94E-0 4 PF D

AV G

= 3,96E-0 3 PF D

AV G

= 7,91E-0 3

The boxes marked in yellow ( ) mean that the calculated PFD

AVG

values are within the

allowed range for SIL 2 according to table 2 of IEC 61508-1 but do not fulfill the requirement to

not claim more than 20% of this range, i.e. to be better than or equal to 2,00E-03. The boxes

marked in green ( ) mean that the calculated PFD

AVG

values are within the allowed range for

SIL 2 according to table 2 of IEC 61508-1 and table 3.1 of ANSI/ISA–84.01–1996 and do fulfill

the requirement to not claim more than 20% of this range, i.e. to be better than or equal to

2,00E-03.

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