MTTFd

MTTFd stands for the mean time to dangerous failure. Determination of the MTTFd according to EN ISO 13849-1, Annex C.5: MTTFd = 2 × MTTF (typical) Grouping according to EN ISO 13849-1:

NOTE! • Standard sensors from wenglor sensoric are not safety components in accordance with Machinery Directive 2006/42/EC. • wenglor sensoric recommends the use of safety products which have been specially developed and certified for this application. WARNING! • Standard components are not suitable for personal safety tasks. • Standard photoelectronic sensors may not be used for detecting persons (in addition to the MTTFd, numerous other criteria and measures must be observed in order to implement safety applications). wenglor sensoric GmbH determines MTTFd values for standard sensors based on the following: • Parts count process (EN ISO 13849-1, Annex D.1) • Failure rates for components (Siemens standard SN 29500) or manufacturer’s specifications for special components (such as ASIC) • Ambient conditions: Ta = 40°C, operating voltage = 24 V DC In addition to the MTTFd value specified in the data sheet, the following parameters apply to standard sensors: • DC = 0%. Standard products do not have any diagnostic coverage. • TM = 11.42 a (photoelectronic and ultrasonic sensors) • TM = 20 a (inductive and other sensors) • This data applies unless stipulated otherwise in the data sheet or operating instructions.