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The concept began with the idea of connecting each component of the Safety Loop in such a way that a signal could be passed from component to component. The signal would only be passed if the component was working properly. Therefore the signal could be monitored as the "Pulse" of the SIS.
Further development of the concept for practical applications lead to the realization that each of the Field Devices of the Safety Loop were made up of multiple components. By passing the signal from component to component within a specific Field Device, the Pulse is created. SafetySIL’s products are designed to use this Pulse as the Live Signal for Safety. That is if any component has a failure, even hidden, the signal (Pulse) will no longer be passed around. So, no Pulse – there DEFINITELY is a failure in the system. Pulse – it is VERY UNLIKELY there is a hidden failure in the system.
Cycling Self Checking Block Valve
Cycling, Self Checking Pressure Sensing System
Cycling, Self Checking Pressure Sensing System