is there any RTD converter to 4-20 mA SIL 3 certified?

 

I'm sure there are dozens, but here's two that have 3rd party certification:

Honeywell STT850:
http://tinyurl.com/ndn8dge

Siemens TF:
http://tinyurl.com/q447zh2

Input devices by themselves do not constitute a Safety Instrumented System at any level, regardless of their certification.