Photoelectric Detectors Improved with OPTEX Innovation to Provide Advanced Performance in Outdoor Detection. OPTEX Photoelectric Detectors with Innovative Features for Easy Installation Provide Stable Performance against False Alarms for More Effective Outdoor Detection and Non Security Applications. The OPTEX AX-100/200 Photoelectric Detector Series is the next step in Outdoor Detection and will satisfy all the needs of both users and installers.