Air gap sensor SOPA-CM4H-R1-HQ6-2N-M12 For contactless distance sensing. Authorisation=(* RCM Mark, * c UL us - Recognized (OL)), CE mark (see declaration of conformity)=(* to EU directive for EMC, * in accordance with EU RoHS directive), KC mark=KC-EMV, Materials note=(* Free of copper and PTFE, * Conforms to RoHS), Measuring principle=pneumatic