Man has always sought to facilitate its work - invented the wheel, which allowed him to easily carry heavy loads, then a car capable of moving it in space on a fairly long distances, washing machine, self-washed and spun things.It came even before the light outside began to turn on and off as if by magic - dusk light bulb, and with the sun - go out.This is due to a light barrier for street lighting, or as it is called - the twilight switch.
The principle of photoelectric ↑
The principle of operation of photoelectric based on the photosensor, which controls the level of illumination on the street.This sensor can be remote, that is located outside of the enclosure relay and built (photoelectric senso
photorelay also equipped with a potentiometer, which allows you to accurately determine the threshold for switching on and off.And so the whole system has maximum protection against false positives (there are still bullies in Russia), in the light barrier are inserted special adaptations of possible interference.Quality equipment, having all the certificates will work only if after the occurrence of the exposed master conditions will take a certain time.
Optionally you can set the sensitivity range of the light barrier to light, which is most suited to the conditions of his placement.For example, if the light barrier is installed on the porch of the house and it's summer, the range of its operation is different from the relay, which is available in a garage or in any other room.That is, the device can be programmed based on the intensity of illumination.
The body of virtually all integrated photoelectric switch, which allows you to manually turn on and off the device, thus giving him a little "breathing room."And some models, among other things, equipped with a timer, tripping relays at certain (programmed) time that the equipment did not work for nothing.
scheme FDO ↑
The figure shows a diagram of a light barrier for street lighting that reacts to changes in light intensity.As the sensor is used LED, it works on the same principle as the solar cell.
LED (in this case HL1) - this is a solar cell that generates a voltage proportional to the light intensity incident on the crystal.The circuit also has a DC power supply and R1-R2, which allows you to adjust the sensitivity of the light barrier, because different LEDs of different sensitivity.
Resistor R2 adjusts the initial voltage VT1, integrable voltage generated HL1.It is this element allows you to adjust the threshold for the light barrier.
types photoelectric street lighting ↑
Depending on the application and specific photoelectric come in several forms:
- photoelectric photocell inside the body
- photoelectric photocell inside the body and timer
- photoelectric adjustable threshold
- photorelay withexternal light sensor.
devices with photocell inside the body ↑
This type of street light barrier allows you to turn on the lights after dark and turn it off with the sunrise without human intervention.The housing unit, even though it is transparent, protects the cell from harmful environmental influences.
With internal photocell and timer ↑
This photocell for street lighting in addition to the advantages described above, has one distinct advantage - the ability to control the brightness depending on the time of day.With such a device, you can set the resolution of photoelectric work.The device will be included in the allowed period of time when the light level is below the value that was set.If the light level is above a predetermined value, the output will be off.Also, it will be turned off, and if the timer is outside the allowed period.
timers in turn, too, are different.Some devices are equipped with fluorescent timers, others - weekly and even yearly, and for the last period allowed for the relay can be set for each day is different, or orient it for several days at once, for example, on weekends.
relay with adjustable threshold ↑
This type of relay has the same operating principle as the previous two, however,the underside of the body it has a small "handle", which regulates the rotation threshold photocell.If the regulator is turned in the plus side, the lighting device will be activated, even when a small blackout, for example, during a lightning storm, or when it is cloudy.If you turn it in the direction of minus, the device only works when it is dark.
Thus, this device allows you to control the relay, depending on the time of year and weather conditions inherent to a particular locality.
device with external photocell ↑
This device allows you to place a cell separate from the main unit of the relay.Maximum distance from the first second can reach 100-150 meters.The block itself is mounted in a switchboard.
tips to help the buyer ↑
primarily oriented to their own needs and opportunities, and on the basis of the conditions in which you live.For relays with adjustable threshold - ideal for summer cottages, and for multi-family housing.This device will allow significant savings on payment of utility bills for electricity, because it can be adjusted on a regular basis, depending on the time of year.
relay with built-in photocell body well so that it is easy to mount, and this event is not necessarily charging electricians - can cope with almost every work.But the device with external light sensor will require some skill and specific skills, but it is perfect for large-scale industrial plants, warehouses, and other similar institutions.
relay timer, though, and is more expensive, will also save considerably on your bills because it can be programmed to suit your needs and requirements - the appliance will operate only when you want it, not when he wants sun and the moon.It will not only include the time, issued by you, but also to work in the mode you want.
Video on selecting and installing ↑
photorelay - is a versatile device that will free your hands and thoughts.He will turn on and off lights, to respond to changes in light levels, take care of your security.In addition, the device can be supplemented by a motion sensor, which immediately "notify" the relay on the approximation of rank or intruder.This little detail will transform your home into a fortress, cozy and welcoming.