No.
Safety accessories are devices designed to protect pressure equipment against exceeding the allowable limits (pressure, temperature, water level, …). The suitability of the device or combination of devices is determined on the basis of the particular characteristics of the equipment or assembly.
For example:
a) A combination of a level gauge and a pressure relief system
b) A combination of a low level water gauge and the burner shutdown device installed on a steam boiler, including all elements of the safety logic
c) A safety-related system detecting the rate of a chemical reaction to avoid a run away reaction and initiating corrective action.
See also PED Guideline A-20