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The PFD value for the complete safety device is calculated from the values of the individual components. Since sensors and actuators are installed in the field, these are exposed to chemical and physical loading (process medium, pressure, temperature, vibration, etc.). For this reason, 25 percent of the overall PFD is assigned to the sensors, and 40 percent to the actuators. [...]15 percent remains for the fault tolerant control system, and 10 percent each for the interface modules. [...]of the FMEA, the PFDavg can be calculated for each of the relevant isolators and is shown to be less than 10-3, thus enabling their possible use within this specific application.