Given that all major vendor field transmitters have their own brand limits for low-scale and high-scale fail-safe values, but, to my knowledge they all also offer NAMUR 43 limit values, as shown in the graphic at the link below.
It isn't clear to me if NAMUR offers an advantage, other than the values are standardized, so brand A with NAMUR fail-safe values would have the same fail-safe values as brand B or brand C.
