Wattstopper
®
Occupancy and Light Level Sensor • Low Voltage Ceiling Fixture Mount
Installation Instructions • Instructions d’Installation • Instrucciones de Instalación
No: 25788 – 03/17 rev. 1
Catalog Number • Numéro de Catalogue • Número de Catálogo: FS-205
Country of Origin: Made in China • Pays d’origine: Fabriqué en Chine • País de origen: Hecho en China
SPECIFICATIONS
Power
Voltage .......................................................................... 24VDC
Current Consumption .....................................................4.5 mA
Power Supply .........WattStopper FS-PP Power Pack
Adjustments
Time Delay ...................................... 30 seconds — 30 minutes
Light Level ............Hold Off, minimum <10fc, maximum >120fc
Coverage @ 8’ height ................................. 14’ diameter (max)
Operating Temperature .....................32° to 131°F (0° to 55°C)
Dimensions
Throat ................................................... 0.75” diameter (19mm)
Collar ................................................. 1.12” diameter (28.6mm)
Lens Pipe Length ............................................... 0.38” (9.6mm)
Body .............1.12” x 1.38” x 0.5” (28.6mm x 35mm x 12.7mm)
U.S.Patent: 5,124,566
DESCRIPTION AND OPERATION
The FS-205 occupancy sensors turn lighting ON and OFF based
on occupancy and ambient light levels. The light level feature can
be used to keep lights from turning ON if the ambient light level is
sufficient.
The sensors use passive infrared (PIR) sensing technology that
reacts to changes in infrared energy (moving body heat) within the
coverage area. Once the space is vacant and the time delay elapses
(adjustable from 30 seconds to 30 minutes), lights will turn OFF.
Sensors must directly “see” motion of an occupant to detect them,
so careful consideration must be given to sensor placement. Avoid
placing the sensor where shelving or other obstructions may block
the sensor’s line of sight.
COVERAGE PATTERN
Density and range of the coverage pattern is determined by mounting height. The FS-205 has a multi-cell, multi-tier Fresnel lens with a
view of 360°. This lens is designed to detect small motion when mounted within 6' of occupants. Coverage shown in the diagrams below
is maximum. They represent full-step walking motion, with no barriers or obstacles. When mounted at a height of 8', the coverage area
is approximately 14' diameter.
(0m) (0.8m)
(1.5m)
5'
(1.5m)
7.5'
(2.3m)
0ft
(0m)
5'
(1.5m)
7.5'
(2.3m)
(2.3m)
(1.5m)
(2.3m)
(0.8m)
2.5'
(0.8m)
2.5'
(0.8m)
5'
(1.5m)
8'
(2.4m)
0ft
(0m)
(0m) (0.8m)
0ft 2.5'
(1.5m)
5'
(2.3m)
7.5'
(1.5m)
5'
(2.3m)
7.5'
(0.8m)
2.5'
2.5'
(0.8m)
FS-205 coverage pattern, top view
FS-205 coverage pattern, side view
The power supply for the FS-205 is a FS-PP power pack mounted inside a light fixture. Each WattStopper FS-PP power pack can
supply power for up to ten FS-205 sensors.
The sensor is equipped with a 6’ long cable fitted with a male RJ45 plug. The FS-PP has a corresponding female RJ45 receptacle. This
cable carries power to the sensor and the 24VDC maintained output to the power pack to signal that lights should be on.
Important: There is an initial warm-up period external load to the sensor.
It may take up to a minute for the sensor to warm-up during the initial power-up. The sensor has an “instant on” feature. This occurs
during installation or after a lengthy power failure only. As soon as power is supplied, the lights will come ON and stay ON for
approximately 1 minute. If no movement is detected within that time the lights will turn OFF until detection occurs. If movement is
detected during the initial 1 minute then the lights will stay ON for whatever time has been set on the time delay.