Emerson EL-O-Matic F Series Safety Manual

7
September 2018
SIL Safety Manual
DOC.SILM.EF.EN Rev. 1
Failure Modes and Estimated Failure Rates
Section 6: Failure Modes and Estimated
Failure Rates
Table 1. Failure Modes and Estimated Failure Rates – El-O-Matic F-Series Actuator
Configuration
Safety Function λDU [1/h] λDD [1/h] λS [1/h]
F- No PST 1
2,55E-08 0,00E+00 0,00E+00
F - With PST 1
2,29E-09 2,.32E-08 0,00E+00
NOTE:
• No internal diagnostics is included in the product.
• The above failure rates are guaranteed:
- For the service conditions listed in Section 4.
- For the expected lifetime declared in Section 5.
- Considering the periodic test and maintenance included in Section 8.
The failure rates are determined performing a FMEDA based on the failure rates of
components taken from industrial databases (NPRD-2016/FMD97/2016, EXIDA E&MCRH
and NSWC-2011), integrated with eld feedback using the Bayesian statistical approach
mentioned in IEC 61508-2 Par. 7.4.4.3.3.
The system for reporting failures is based on eld feedback from end users, with:
- Identication of the claim/failure
- Root cause analysis to identify cause and responsibility of the failure
- Identication of the possible effect of the failure on the Safety Function
- Classication of the failure considering the failure categories of IEC 61508-2
(Safe, Dangerous, No Effect) Customer Service, Quality and Technical
Department are responsible for the procedure, according to the respective role.
Section 6: Failure Modes and Estimated Failure Rates

Emerson EL-O-Matic F Series Specifications

General

Brand	Emerson
Model	EL-O-Matic F Series
Category	Controller
Language	English