The OSFHU self-contained sensor mounts directly to a luminaire or electrical box to provide local occupancy control for either general area or aisle way pattern detection using PIR technology with a microprocessor based digital architecture that minimizes false triggering. The OSFHU provides a trouble free install and forget solution for high bay lighting control. The OSFHU high bay occupancy sensor is specifically designed for high mounted areas such as warehouses, manufacturing and other high ceiling applications. The OSFHU installs directly to an industrial fluorescent luminaire or an electrical junction box. It is a self-contained sensor and relay that turns individual light fixtures ON or OFF based on occupancy in the detection zone. It comes with three interchangeable lenses for use in either a 360 deg high bay or 360 deg low bay general area or an aisle way. The OSFHU provides reliable coverage up to 40 ft mounting heights. The OSFHU is also available in a model for cold storage applications with temperatures as low as 40 deg F. To improve the field of view for deep body fixtures, a separate offset adapter accessory (OSFOA-00W) can be used to position the sensor below the fixture body. The adapter simply snaps into a 1/2 in knockout ON the end of the industrial fixture to attach the sensor. Green LED indicates occupancy detection.