圖爾克壓力變送器，PT025R-14-LI3-H1131
Version History: V3R0: IM1-12-R, IM1-12
-T and IM1-22-T added; February 21, 2014
V2R0: IM1-22-R added; February 8, 2013
V1, R1.0: External review comments integrated; April 14, 2005
V0, R2.0: Internal review comments integrated; March 31, 2005
附錄1.1：可能的驗證測試，以檢測未檢測到的危險故障
驗證試驗包括下列步驟的，如表11所述。
1采取適當(dāng)?shù)男袆樱员苊庹`行程
2提供NAMUR控制信號給隔離開關(guān)放大器打開/關(guān)閉
輸出并驗證輸出為開/關(guān)。
Therefore it is obvious that the PFDAVG calcu
lation is only valid for components which have this
constant domain and that the validity of th
e calculation is limited to the useful lifetime of each
It is assumed that early failures are detecte
a huge percentage during the installation period
and therefore the assumption of a constant fail
ure rate during the useful lifetime is valid.
在FMEDA過程中發(fā)現(xiàn)可在驗證測試進行檢測。
表8，表9和表10示出重要的危險的重要性分析
未檢測到故障，并指出如何將這些故障可在驗證測試進行檢測。
附錄1應(yīng)編寫安全手冊的時候，因為它包含重要的安全考慮
The circuits of the Isolating Switching Amplifie
rs IM1-(Ex)- and MK13-R-Ex0 do not contain
any electrolytic capacitors or other componen
ts that are contributing to the dangerous
undetected failure rate. Therefore there is no
limiting factor with regard to the useful lifetime of
However, according to section 7.4.7.4 of IEC
 61508-2, a useful lifetime, based on experience,
should be assumed. According to sectio
n 7.4.7.4 note 3 of IEC 61508-2 experience has shown
that the useful lifetime often lies within a range of 8 to 12 years.
這個測試將檢測90％以上的
隔離開關(guān)放大器的可能“嘟”的故障。
V0, R1.0: Initial version; March 11, 2005
Authors: Stephan Aschenbrenner
根據(jù)IEC第7.4.3.2.2六）61508-2驗證測試應(yīng)采取以揭示
危險故障這是由診斷試驗檢測到。
這意味著，既要指定如何危險不能檢測的故障已被

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