How do you specify transmitters for SIL-rated applications?

SIL transmitter specification: IEC 61508 certification with safety manual (containing PFDavg, SFF, and lambda values), appropriate process connections and materials, redundant sensing where required (dual sensors in single housing for SIL 2/3), fail-safe output on sensor failure (upscale or downscale burnout), HART or digital communication for diagnostics, proof test capability (comparison with reference, self-diagnostics), and environmental rating. Specify: SIL capability (SIL 2 or SIL 3 capable), architectural constraints (1oo1 or 1oo2D), systematic capability matching target SIL, and required proof test interval. Document in SIS specification with safety manual references.