●CE marking

CE marked products or equipment that are imported to countries that are EU members must conform to the EC directives.
SMC products are subject to either or both the low power voltage directive (regarding electrical safety) and the EMC directive (regarding noise conformity).
The operating voltage of the sensors is 24 VDC, therefore it is not subjected to the low voltage directive (50 to 1000 VAC or 75 to 1500 VDC).
The sensors undergo EMC testing by a third party and bears the CE marking (self-declaration).
Since the product is a component which is ultimately integrated into the user's equipment machine or facility, the user must confirm that the product conforms to the EC directive.

●Enclosure

The enclosure is rated according to the IP (International Protection) standards (IEC60529) which defines protection against dust or water.
IP40: Is not protected against the water intrusion, even though a wire exceeding 1.0 mm in diameter can not enter.
IP65: Powdered dust cannot enter the enclosure and the enclosure is not affected by water sprayed from all directions.
IP67: Powdered dust cannot enter the enclosure, as well as water, even though the enclosure is immersed in water with a specified pressure and time.

●UL/CSA standards

UL and CSA standards have been applied in North America (U.S.A. and Canada) symbolizing safety of electrical products, and are defined to mainly prevent danger from an electrical shock or fire, resulting from trouble with the electrical products.
The power supply of the pressure sensor is 24 VDC, which does not meet the voltage requirement for the electrical shock category. However, measures against a fire hazard have been taken.
Some pressure sensors are UL/CSA certified. (Use the UL approved products for DC power supply combinations. Refer to each product’s operation manuals for details.)