... Frequency Conversion *Active Infrared Detector *Triple Beams Simultaneously Blocked Inspection Triple Beams Alarm, Infrared Beam Sensor, Active Infrared beam sensor, active infrared detector, alarm ... )11.Optical Axis Adjust Angle(Vertical): 20Degree(+-10 Degree) Triple Beams Alarm, Infrared Beam Sensor , Active Infrared Detector (JD-ABE-50/100 ...