Selecting a Photocell The decay or fall time is defined as the time necessary for the light conductance of the photocell to decay to 1/e (or about 73%) of its illuminated state. At 1 fc of illumination the response times are typically in the range of 5 msec to 100 msec. The speed of response depends on a number of factors including light The photocell is most suitable for PHOTOCELL MUST BE AT LEAST 12" FROM SIDE OF SKYLIGHT AND FACING UP. NOTE: SUPPORT CONDUIT FROM UNISTRUT AS REQUIRED Product Specification Bulletin PHOTOCELL DATA SHEET[1].PDF Author: simmetp Luna Optoelectronics' Cadmium Sulfoselenide (CdS) sensors are low cost photo-conductive devices for visible light measurement designed to sense light from 400 to 700 nm. Their resistance decreases as the light level increases with efficiency characteristics similar to the human eye. These light dependent resistors are available in a wide range of resistance values. WTF12-3P2431 | W12-3 SMALL PHOTOELECTRIC SENSORS Ripple ? 5 V pp 2) Power consumption 45 mA 3) Switching output PNP Output function Complementary 5 4. Usage 4.1 With Arduino Follow these simple steps to build a Grove circuit using the light sensor: 4.1.1 Hardware connection When using the module in conjunction with an Arduino or a Seeeduino, use the Grove - Base Shield and connect the Grove - Light Sensor module to the shield using a designated Grove Photocell for field installation in lighting fixtures* Cat. # Voltage Range Current Rating V2PC20 120V, 50/60Hz 3.3A V2PC22 208-240V, 50/60Hz 1.8A V2PC27 277V, 50/60Hz 1.4A Photocell in DS cover for use with FS/FD box Cat. # Voltage Range D2S20 120V, 50/60Hz D2S208 277 208V-277V Photocell in EIH enclosure for use in Class I, Division 1 The compact, miniature casing of the P12HE ensures this photocell can easily be installed into lighting units where space is at a premium, such as in bulkhead light fittings. With highly accurate positive switching at 70 & 105 lux, the P12HE photocell is ideal for industrial, commercial and residential settings, along with providing ment for IBM ® AT-compatible -12- or 24-hour format-Optional daylight saving adjustment Calendar in day of the week, day BQ3287AMT, BQ3287MT, datasheet, datasheets, pdf, Texas Instruments, datasheetcatalog, datasheetcatalog.com Created Date: 11 Series - Light Dependent Relay 12 - 16 A For outline drawing see page 8. Features Relays for automatic control of lighting according to ambient light level - with separate photoelectric sensor 11.42 - 1 CO + 1 NO 12 A output contacts Find IBM Power Systems literature, brochures, data sheets and more. NOTE: The D2S Series photocell has a built-in-time delay of 10 seconds. At night, the fixture will take 10 seconds to be switched on after power is supplied. The time delay will prevent nuisance trippings due to external light sources at night or shadows during the day. D2S SERIES REMOTE PHOTOCELL INSTALLATION INSTRUCTIONS AND MAINTENANCE Illuminated Resistance 10 Lux @ 2856°K 12 - 58 K? Sensitivity - 0.7 - Lux Spectral Peak Flooded - 520 - nm Rise Time 10 Lux @ 2856 °K - 55 100 ms Fall Time After 10 Lux @ 2856 °K - 25 - ms **R100, R10: cell resistances at 100 Lux and 10 Lux at 2856 K respectively . Illuminated Resistance 10 Lux @ 2856°K 12 - 58 K? Sensitivity - 0.7 - Lux Spectral Peak Flooded - 520 - nm Rise Time 10 Lux @ 2856 °K - 55 100 ms Fall Time After 10 Lux @ 2856 °K - 25 - ms **R100, R10: cell resistances at 100 Lux and 10 Lux