	Photoelectric Sensors

Photoelectric Sensors/Features/Detection configuration

Outline

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.

Features

Non-contact detection

Non-contact detection eliminates damage either to the target or sensor head, ensuring long service life and maintenance-free operation.

Detection of targets of virtually any material

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.

Long-detecting distance

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'.

High response speed

The photoelectric sensor is capable of a response speed as high as 20 µs.

Color differentiation possible

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.

Highly accurate detection

A unique optical system and a precision electronic circuit allows highly accurate positioning and detection of minute objects.

Detection configuration and features

Type

Detection configuration

Features

Model
(KEYENCE products)

Thrubeam

Detection occurs when the target crosses the beam between transmitter and receiver.

	Long-detecting distance
	Stable detection
	Opaque objects are detectable regardless of shape, color or material
	Powerful beam

LV,LX2,PZ-M,PZ2,PS,PW,PJ,PJ‐S,PQ and FS,FS2,FS-L units

Retro-reflective

Detection occurs when the target crosses the beam between sensor head and reflector.

	Reflector allows for installation in a limited space
	Simple wiring
	Easily-adjustable optical axis
	Opaque objects are detectable regardless of shape, color, or material

PZ-M,PZ2,PW and LV,FS units

Diffuse-reflective

Detection occurs when the light beam is reflected by the target and received by the sensor.

	Space-saving
	Adjustment of optical axis not required
	Reflective transparent objects are detectable
	Color differentiation possible

PZ2,PS,PW, and FS,FS2 units

Focused-beam reflective

Detection occurs when the beam spot is reflected by the target and received by the sensor.

	Minute objects detectable
	Target markings detectable
	Detection throuth narrow slits
	Visible beam spot

LV and FS,FS2,FS-L units

Small-spot definite reflective

The transmitting and receiving portions are constructed at an angle allowing detection within the limited area where the optical axes intersect.

	Effect of target background minimal
	Low hysteresis
	Slight height differences detectable

PS, and FS,FS2,LV units
(Internal lens units)

Fixed-distance

Detects the target at a specific distance according to the angle of the reflected light beam.

	Unaffected by highly reflective target background
	Stable detection of targets of colors and materials with varying reflectance
	Highly accurate detection of minute ofjects

PZ-V,PZ-M

Luster recognition

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.

	Detection is not affected by target color.
	Transparent targets can be detected.

PI-G

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