The Hubbell Bryant MSU500C Ultrasonic Occupancy Sensor is excellent in detecting minor motion near the sensor. This sensor also includes Bryant's Adaptive Technology which allows you to install and forget, saving time and money from not having to do constant adjustments. This technology also helps eliminate false-offs and disturbances. The digital, crystal controlled ultrasonic transmitter and receiver offers coverage in each direction for superior motion sensing. The ceiling mounted sensor is concealed in an off-white ABS enclosure that blends in with ceiling tile. Ultrasonic (US) technology senses occupancy by bouncing sound waves (32 kHz - 45 kHz) off of objects and detecting a frequency shift between the emitted and reflected sound waves. Movement by a person or object within a space causes a shift in frequency, which the sensor interprets as occupancy. While US occupancy sensors have a limited range, they are excellent at detecting even minor motion such as typing and filing, and they do not require an unobstructed line-of-sight. This makes US technology sensors ideal for an application like an office with cubicles or a restroom with stalls. The Bryant 180°, 500 Square Foot Occupancy Sensor is also available with 180°, 1,000 Sq Ft and 360°, 2,000 Sq Ft coverage, each sold separately.
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