5Pcs Infrared Photoelectric Switch Sensing Range 5 to 30cm Adjustable Obstacle Avoidance Sensor Module 10‑36V DC Item Type: Infrared Photoelectric Switch Mode: E18 5DL Material: ABS Sensing Range: Approx. 5 to 30cm / 2 to 11.8in adjustable Maximum Current: 300mA Response Time: Less than 2m/20ms Pointing Angle: 3 °, - 10 °, - 20 ° Working Environment Temperature: - 25 to +55 ℃ Protection Grade: IP54 Standard Test Object: Sunlight below 10000LX, incandescent lamp below 3000LX Operating Principle of Photoelectric Switch: Photoelectric switch is also called photoelectric sensor. The sensors are divided into diffuse reflection type, feedback reflection type and opposite reflection type. They are used together with PLC programmable controller, single chip microcomputer, non gate circuit electronic counter, solid state relay, small relay and other products. The transmitting type aiming target uninterrupted transmitting beam receiver converts the received optical energy into current and transmits it to the following detection line, which can filter out the effective signal and apply the signal.