A sensor alone does not meet the definition of a pressure accessory, nor the definition of a safety accessory in according to PED, therefore no CE marking to be put on the individual sensor.
Note: The conformity assessment procedure and essential safety requirements of PED relate to the complete safety system.
The requirements to the sensor may be different depending upon the safety concept employed (for example redundancy or fail safe, see Annex I point 2.11.1).