United Electric Controls has completed a project with Exida, L.L.C. to provide a Failure Modes, Effects, and Diagnostics Analysis (FMEDA) report for the One Series Electronic Switch product line. 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
The One Series Electronic Switch is categorized as a self-diagnostic smart device that senses temperature or pressure and provides discrete (on-off) and 4-20 mA analog (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 SIL 1 applications.