Series

Model

Basic Knowledge of Photoelectric Sensors

Sensor Structures and Selection of Photoelectric Sensors

Detection Method

Type	Detection method	Description	Popular models
Through-beam		Each of emitter and receiver units are used in a pair. Since the amount of light received is relatively high, it is less influenced from dust in environment.	Z4T-2500N ZT-L3000N
Retro reflective		A pair of sensor and reflector is used. These require less installation space and wiring, compared with through-beam type.	Z4R-400N ZR-L1000N
Diffuse reflective		A single unit of sensor detects light reflection from an object. These require less installation space and wiring.	Z4D-100N
Wide-angle diffuse reflective		A wider aperture angle is equipped to detect a small difference in received light amount. These are suitable for detecting transparent objects and objects with holes or gaps.	Z3D-W20N
Back Ground Suppression		A light receiving element of 2-PD, PSD or C-MOS is used to make an output upon detection at a preset distance. Detection of these models are less influenced from colors and materials of an object.	ZA-BL60 BGS-ZL10N Z4B-10N BGS-2V50
Transparent-object detection		A pair of unit with a low hysteresis and reflector detects a small difference in received light amount. These are suitable to detect a transparent object, such as a film or glass.	DR-Q400TN ZR-QX200N KR-Q50NW KR-Q300NW
Separate amplifier		A combination of sensor head and amplifier can be selected according to application requirements. Various detection configurations can be set on an amplifier.	D2SA-MN DSD-100
Fiber-Optic Cables		An optical fiber is used to transfer light from emitting part to receiving part of the sensor.	NF-DB01 NF-DF08 NF-TR01 NF-DC39
Fiber-Optic Sensors		A combination of Fiber-Optic Cables and Fiber-Optic Sensors can be selected according to application requirements. Small dimensions of Fiber-Optic Cables makes its installation possible in a small space. Combinations of various models can be made, even for detection of a color, height gap and liquid level.	D4RF-T
Color/Mark detection		High resolution sensors can detect subtle color differences and contrast.	DM-18TN

How to Select a Photoelectric Sensor

Purpose and condition		To be considered	Applicable sensors
Selection by detection	Positioning by detection of presence	Positioning accuracy Easy installation	Through-beam Laser BGS
	Small-object detection	Small spot sizes Adjustable sensitivity	Fiber Laser
	Detection of fast-moving objects	Short response time	Fiber
	Transparent-object detection	High-sensitivity/retro reflective	Transparent-object detection
	Detection of surface unevenness	Small hysteresis	Diffuse reflective BGS Displacement
	Color mark detection	Colors of color mark, background and sensor light Short response time	Color mark detection Fiber
	Color contrast detection	High resolution	Mark sensor
	Detection of less influenced by color differences	High-resolution receiver element	Laser BGS
Selection by installation location	Small space	Small sizes	Fiber Miniature, Head-on/side-on
	Installation on one side		Diffuse reflective, Limited diffuse reflective BGS
	Reflection from background	Small hysteresis	BGS
	Influence from ambient illuminance	Wider resistance against ambient illuminance	Laser
	Robustness		Resin filled Metal housing
	Location with water	High water resistance	IP67, IP69K

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