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Photoelectric Sensors/Features/Detection configuration |
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Outline
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A photoelectric sensor emits a beam of light (visible or infrared) from its transmitter. A reflective type photoelectric sensor is used to detect the light beam reflected from the target and the thrubeam type is used to measure the change in light quantity caused by the target crossing the beam.
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Features
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Non-contact detection |
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Non-contact detection eliminates damage either to the
target or sensor head, ensuring long service life and
maintenance-free operation.
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Detection of targets of virtually any material |
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Detection is based on the quantity of light received, or
the change in the quantity of reflected light. This
method allows detection of targets of such diverse
materials as glass, metal, plastics, wood, and liquid.
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Long-detecting distance |
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The diffuse-reflective photoelectric sensor has a detecting distance of up to 1 m 3.3', and the thrubeam has a detecting distance of up to 10 m 32.8'.
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High response speed |
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The photoelectric sensor is capable of a response
speed as high as 20 µs.
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Color differentiation possible |
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The sensor has the ability to detect light from an object based on the reflectance and absorption of its color, thus permitting color detection and differentiation.
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Highly accurate detection |
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A unique optical system and a precision electronic
circuit allows highly accurate positioning and detection
of minute objects.
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Detection configuration and features |
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| Type |
Detection configuration |
Features |
Model
(KEYENCE products) |
| Thrubeam |
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Detection occurs when the target crosses the beam between transmitter and receiver.
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Long-detecting distance |
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Stable detection |
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Opaque objects are detectable regardless of shape, color or material |
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Powerful beam |
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LV,LX2,PZ-M,PZ2,PS,PW,PJ,PJ‐S,PQ and FS,FS2,FS-L units |
| Retro-reflective |
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Detection occurs when the target crosses the beam between sensor head and reflector.
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Reflector allows for installation in a limited space |
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Simple wiring |
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Easily-adjustable optical axis |
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Opaque objects are detectable regardless of shape, color, or material |
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PZ-M,PZ2,PW and LV,FS units |
| Diffuse-reflective |
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Detection occurs when the light beam is reflected by the target and received by the sensor.
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Space-saving |
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Adjustment of optical axis not required |
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Reflective transparent objects are detectable |
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Color differentiation possible |
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PZ2,PS,PW, and FS,FS2 units |
| Focused-beam reflective |
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Detection occurs when the beam spot is reflected by the target and received by the sensor.
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Minute objects detectable |
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Target markings detectable |
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Detection throuth narrow slits |
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Visible beam spot |
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LV and FS,FS2,FS-L units |
| Small-spot definite reflective |
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The transmitting and receiving portions are constructed at
an angle allowing detection within the limited area where the optical axes intersect.
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Effect of target background minimal |
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Low hysteresis |
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Slight height differences detectable |
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PS, and FS,FS2,LV units
(Internal lens units) |
| Fixed-distance |
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Detects the target at a specific distance according to the
angle of the reflected light beam.
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Unaffected by highly reflective target background |
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Stable detection of targets of colors and materials with varying reflectance |
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Highly accurate detection of minute ofjects |
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PZ-V,PZ-M |
| Luster recognition |
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When the light beam hits a target, the beam reflects
differently according to the luster of the target. The
sensor detects the difference in luster based on how the
beam reflects (specular or diffusive) light.
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Detection is not affected by target color. |
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Transparent targets can be detected. |
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PI-G |
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