E58 Series Features: 18mm or 30mm diameter sensors. Unmatched optical performance - sophisticated long-range optics detect targets even in dirty environments. Resistant to many chemicals used in the automotive, food and forest products industries. Suitable for high temperatures and high pressure cleaning (82 bar). Mechanical Viton seals are resistant to extreme temperature changes. The visible measuring beams on all models simplify installation and alignment of the light sensors. The function display has an unmatched brightness and is visible from any direction and in all lighting conditions. The only sensors available on the market with background suppression and a 2-wire circuit. 4-wire DC sensors each have a PNP and NPN output