The calculator proved that a simple $50 metal guard was SIL-valid, saving $5,000 worth of safety relays and sensors.

Se (4) x Fr (4) x Pr (5) = Score 80? Wait—this seems higher. Correction: In IEC 62061, a high Pr value (easy avoidance) actually lowers the risk. Let's clarify the standard math:

If the hazardous event occurs, can the operator avoid it?

Suddenly, you know exactly what kind of safety relay, wiring, and logic you need.