OsiSense XS - studiecd.dk

1Functional safety of machinery> Approach according to EN/IEC 62061Risk estimation for SIL assignmentRisk related tothe identifiedhazardSeverity ofthe possibleharmFrequency and duration of exposureProbability of occurrence of a hazardous eventProbability of avoiding or limiting harmFrPrAvProbability ofoccurrence ofthat harm2Example of SIL assignmentThis assignment should be carried by determining the risk parameters that are shown below in an example.3ConsequencesSeverity (Se)Irreversible: death, losing an eye or arm 4Irreversible: broken limb(s), losing a finger(s)3Reversible: requiring attention from a medical practitioner 2Reversible: requiring first aid14Frequency and duration of exposure (Fr)Frequency of exposure> 10 min1 h> 1 h to 1 day55> 1 day to 2 weeks4> 2 weeks to 1 year 3> 1 year 2Probability of occurrenceVery highProbability (Pr)5Likely4Possible 3Rarely2Negligible 1Probability of a voiding or limiting harm (Av)Impossible 5Rarely 3Probable15Serial no.12HazardHazard XSe Fr Pr Av CI4 5 + 4 + 3 = 12678ConsequencesDeath, losing an eye or armPermanent, losing fingersReversible, medical attentionReversible, first aid(Se)43213-4SIL 2Class CI5-7SIL 2OM8-10 11-13 14-15SIL 2SIL 1OMSIL 3SIL 3SIL 2SIL 1OMSIL 3SIL 2SIL 1Frequency and durationFr 1 h to 1 day to 10 -8 to 10 -7 to 10 -6 to