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photoelectric sensors detect the
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presence or distance of objects in
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various industrial applications they
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typically integrate all necessary Optics
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and electronics into a single unit
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requiring only a power supply to
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function and provide an output based on
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the specifications and the object
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detection criteria photoelectric sensors
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also called photo eyes detect object's
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presence or distance using light these
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sensors use a light source from an
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emitter and a receiver that detects the
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changes in light intensity reflected or
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disrupted by the Target object without
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physical contact photo wise can detect
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objects at highly close range or out to
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several meters or more depending on the
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specific photo wi technology
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employed there are three basic types of
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photoi sensors through beam reflective
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diffuse the choice of which type to use
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depends on the specific application in
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the following sections we will review
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these three types and discuss the
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reasons for selecting each let's get
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started detailed information contained
1:04
in this video can be found at ACC
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automation.com shop for all your
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automation queries ACC
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automation.com photoelectric
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sensor A through beam photoelectric
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sensor is the first option you should
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look to when looking for a photo sensor
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the sender and receiver are two
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different units the sensor will send out
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a beam of light and the receiver will
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sense this unique beam these units must
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be aligned with each other if the beam
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of light from the center is blocked the
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sensor output is activated indicating an
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object is present the through beam photo
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will provide the most extended range
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from sender to receiver however both
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sides of the object must be available to
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sensor common everyday use of this
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photoelectric is for garage door openers
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you will typically see these mounted on
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each side of the garage door to detect
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objects when the door is
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closing reflective photoelectric
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sensor a reflective photoelectric sensor
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is the next option you should look for
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your application this type of sensor has
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a sender and receiver in the same unit
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so you need to wire just one side the
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sensor will send out a beam of light and
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a reflector will be used to send this
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beam back to the receiver blocking the
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light from the reflector will trigger
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output these sensors are used every day
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for conveyors wiring is done only on the
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one side of the conveyor and reflector
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is mount on the other reflective
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photoelectric sensors simplify
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installation but distance is reduced
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over the through beam sensor since the
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beam of light passes through the object
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twice this is a good option for
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translucent or transparent object such
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as glass or plastic where the light can
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pass through the object and be reflected
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to the receiving part of the
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sensor if you're enjoying this video
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Bell beside your subscription to
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actually receive those
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notifications defused photoelectric
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sensor a diffused photoelectric sensor
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similar to the reflective one houses the
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sender and receiver in the same unit
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however this sensor does not require a
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reflector the light bounces off the
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detected object and returns to the
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receiver this type of photoelectric
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sensor with with the smallest sensing
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distance is straightforward to mount as
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it only requires one location it is
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ideal when nothing can be mounted from
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side special applications for this type
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of sensor include color determination
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making it a versatile and convenient
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option a photoelectric sensor primarily
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consists of an emitter that emits light
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and a receiver that detects light when
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the emitted light is interrupted or
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reflected by the sensing object it
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Alters the amount of light that reaches
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the receiver the receiver detects this
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change and converts it to electrical
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output we have reviewed the three types
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of full electric sensors and established
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the order in which you should evaluate
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application one of the most common
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questions is how to wire three wire
4:22
sensors click here to see how click here
4:26
to learn more about plc's and
