Productive current detection relay for High-Risk Applications
Reliable current detection relay Designs for Industrial and Industrial Applications
CHINA – ?¡ãAny Electronics?¡À proudly presents their whole range of current detection relay . They provide a comprehensive set of current detection relay products as well as other interrelated goods. These units are observed in distinct applications including commercial applications, industrial control circuits along with OEM Panels. These devices come with outstanding precision and repeatability. The common current detection relay which can be designed as of late require very tiny panel space.
Productive current detection relay for High-Risk Applications
Reliable current detection relay Designs for Commercial and Industrial Applications
CHINA – ?¡ãAny Electronics?¡À proudly presents their entire range of current detection relay . They offer a total set of current detection relay solutions and other interrelated products. These units are observed in unique applications which include industrial applications, industrial control circuits and OEM Panels. These devices include great precision and repeatability. The standard current detection relay which are developed today require quite tiny panel space.
current relay switch
high current relay
current relay wiring diagram
There are 4 pins out of the module: VCC , Trig, Echo, GND . So it's a very easy interface for controller to use it ranging. The all process is : pull the Trig pin to high level for more than 10us impulse , the module start ranging ; finish ranging , If you find an object in front , Echo pin will be high level , and based on the different distance, it will take the different duration of high level. So we can calculated the distance easily :Distance = ((Duration of high level)*(Sonic :340m/s))/2
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it turns the lamps on automatically when it is dark.. how does its mechanism work?
And got the following answer:
Some street lights do not have photocells, but rather are turned on at a certain time at night, controlled from a center. It may take them 5 minutes to turn on. If all street lights seem to turn on within one minute, suspect that they are controlled centrally rather than by light detection at the lamp. Some street lights seem to have a light sensor (photocell). Close to my university there is one street that had an always-on street light for a while. It was probably due to defective light sensor. Wikipedia says modern light "may" have a sensor: http://en.wikipedia.org/wiki/Street_light Street lights are High-Intensity Discharge (HID) lamps: http://en.wikipedia.org/wiki/High-intensity_discharge_lamp As I mentioned, they may take 5 minutes to turn on. But once they are on, they are the most efficient type of light out there. Quite bright, and they often have a nice white daylight color (rather than yellowish/reddish incandescent light bulb color). (HID lights are also used in bluish colors for those bright car headlights) Look at some security lights for buildings. If they turn on at night, and look quite bright/white compared to incandescent (standard) home light bulbs, they are probably the same type as street lights (HID), and they definitely are using a photocell (also called photoresistor, commonly a CdS cell = Cadmium Sulfide cell). Photocells can be quite small. I have built many simple night-light circuits with them. They look like this (Wikipedia shows an old model for some reason): http://en.wikipedia.org/wiki/Cds_cell http://edge.cs.drexel.edu/assemblies/tests/assemblies-200209/cds-cell-sensor.html Essentially, when there is light, they show less resistance to electricity. When it is dark, they resist more to electricity. In a circuit, it's not hard to say "if CdS passes electricity, supply no electricity to lamp". Photocells can be quite small: http://images.google.com/imgres?imgurl=http://www.solarbotics.com/assets/images/cds/cds_pl.jpg&imgrefurl=http://www.solarbotics.com/products/cds/&h=450&w=600&sz=22&hl=en&start=8&um=1&tbnid=jVxWo5bFo1vvYM:&tbnh=101&tbnw=135&prev= Wikipedia page for "photoresistor"s also has a close-up of "the internal components of photoelectric control of a typical American streetlight": http://en.wikipedia.org/wiki/Image:Streetlight_control.jpg It looks like the old buzzer doorbell inside. This is quite probably a "relay" that uses a wire wrapped around some metal, which would get magnetized when electricity (current) passes, and will pull a middle metal piece to close or open a circuit: http://home.howstuffworks.com/doorbell2.htm http://home.howstuffworks.com/relay.htm In dark, photocell won't allow electricity to pass through, magnet will not hold anymore, and a spring will pull the relay switch away from the magnet, which will then connect two metal pieces that make the light circuit complete, and the street light will (slowly) come on.
The current detection relay perform exceptionally properly with various applications that are precise to power distribution and protection. The relays include wide adjustment ranges having a scale which is simple to read either in three or four digits according to the model. These current detection relay assist in escalating the flexibility in the applications, reduce the all round power and upkeep fees. You’ll find relays that are used for common purposes which come in dependable styles with quick replacement selections. And you’ll find models which are utilised for industrial applications and heavier duty applications that function on large loads. These goods are produced to meet the lifetime industrial control needs of your applications.
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