Isolator suitable for use in SIL2 circuits
New versions of R Stahl’s type 9170 switching repeater and the type 9175 digital output provide increased safety while transferring intrinsically safe binary signals: for the first time, they ensure complete, consistent error monitoring of every channel from the field to the control level despite an isolator in between.
The new modules, which complement R. Stahl’s ISpac model range, allow users to detect cable errors between isolator and process control units and also to identify interferences in the field which are then reported to the control system via signal channel. Applications with safety-oriented signals according to IEC EN 61508 / 61511 - e.g emergency stops using magnetic valves - will benefit from reliable monitoring of the complete circuit. Safety is increased for the plant, operating staff and the time spent on error detection is minimized. The new modules are suitable for Ex i signals in zones 0 and 1 and, at the same time, for use in SIL 2-compliant signal circuits.
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