Product category:
Pressure measurement systems
News Release from: Able Instruments and Controls | Subject: One Series for SIL1
Edited by the Processingtalk Editorial
Team on 11 September 2007
Simplify your safety shutdown
requirements
Simplify your safety shutdown requirements with the Able One Series pressure and temperature switches, which an FMEDA report shows are suitable for SIL1 applications
with the One Series Pressure and Temperature Switches! Over the decades, the Failure Modes and Effects and Diagnosis Analysis (FMEDA) technique has proven to be one of the best methods of finding potential design flaws in a system To assist implementation of Safety Related Systems (SRS), the International Electrotechnical Commission developed standard IEC61508 and the FMEDA technique is an extension used primarily in the analysis of safety critical electronic systems as part of the IEC61508 certification
This article was originally published on Processingtalk on 9 Jul 2008 at 8.00am (UK)
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Exida, one of the world's leading companies specialising in automation system safety, has completed a Failure Modes, Effects, and Diagnostics Analysis (FMEDA) report for the One Series Electronic Switch product line available through Able Instruments and Controls.
The report is intended for engineers that are designing Safety Instrumented Systems (SIS), by providing test data for calculating the Safety Integrity Level (SIL) of a system containing the One Series.
* FMEDA - Failure Modes, Effects and Diagnostics Analysis: The report summarizes the results of the hardware assessment of the One Series Electronic Switch.
The FMEDA is a major step toward achieving functional safety certification per IEC 61508, providing failure rates and Safe Failure Fractions (SFF) for the electronic and mechanical systems found in the One Series design.
* IEC 61508 - International Electrotechnical Commission functional safety standard for risk reduction.
* SFF - Safe Failure Fraction summarises the fraction of failures, which lead to a safe state of the fraction of failures, which will be detected by diagnostic measures and lead to a defined safety action.
The One Series Electronic Switch is categorised as a self-diagnostic smart device that senses temperature or pressure and provides discrete (on-off) and 4-20 mA analogue (continuously variable) outputs.
The One Series is classified as a Type B device, according to IEC 61508, using micro-controllers and programmable logic.
The FMEDA shows that the One Series has a safe failure fraction between 60% and 90% and, therefore, is suitable for SIL1 applications, with an estimated useful lifetime of 50 years.
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