The High Bay Passive Infrared (PIR) Occupancy Sensors consist of two components. These components were developed to work as a convenient system and include both sensor and lens modules. PIR occupancy sensors are designed for automatic lighting control in warehouses and other indoor high bay spaces. The lenses are specifically engineered to provide reliable coverage from a wide range of mounting heights. LED indicator of occupancy detection for easy verification of coverage. Easy front access to DIP switches for time and sensitivity adjustments. Easy mounting using knockout at end of fluorescent high bay luminaire. Hardware choices for adjustability or static mount. Multi-cell, multi-tier Fresnel lenses. Asymmetric and 360° coverage lens choices. Durable materials for optimal performance in challenging indoor high bay settings. Zero crossing circuitry reduces stress on relay and extends sensor life. Detection signature analysis eliminates false triggers; provides immunity to RFI and EMI. ASIC technology reduces components and enhances reliability. Pulse Count Processing eliminates false offs without reducing sensitivity. Recyclable. Qualifies for ARRA-funded public works projects.