E3Z-LS61 Omron, E3Z-LS61 Datasheet - Page 4

• Manufacturer Part Number: E3Z-LS61
• Description: Industrial Photoelectric Sensors BGS/FGS NPN Output Diffuse pre-wired
• Manufacturer: Omron
• Type: Photoelectric Sensorsr
• Series: E3Zr

Specifications of E3Z-LS61

• Features: Adjustable sensing distance
• Output: NPN
• Sensing Method: Diffuse Reflective
• Sensing Distance: 20 mm to 200 mm
• Light Source: Red LED
• Connection: Prewired Cable
• Output Configuration: NPN
• Sensing Range: 20mm To 200mm
• Output Current: 100mA
• Sensor Output: NPN
• Supply Voltage Range Dc: 12V To 24V
• Output Type: Transistor
• Sensor Input: Optical
• Supply Voltage Max: 24VDC
• Sensing Range Max: 200mm
• Sensing Object: White Paper
• Sensing Light: Red
• Mounting Type: Bracket Mount
• Current - Supply: 30mA
• Voltage - Supply: 12 V ~ 24 V
• Package / Case: Module, Pre-Wired
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Principle of Operation
■ Background Suppression
Background Suppression: Objects beyond the set distance will not
be detected.
To ensure reliable background suppression, a minimum separation
distance between the set distance and the background is recom-
mended. Please refer to the “Hysteresis vs. Sensing Distance” graph
in the Engineering section of this data sheet to determine the mini-
mum separation distance.
Example: A target that has a reflectivity that is similar to a black
paper is set to a maximum set distance of 160 mm. Based on the
“Hysteresis vs. Sensing Distance” graph, the hysteresis is 5%. The
recommended minimum separation distance in this case is 8.0 mm
(5% of 160 mm) between the background and the set distance. This
means that the background must be at least 8.0 mm behind the set
distance.
■ Foreground Suppression
Foreground suppression: Objects in front of the set distance will
not be detected.
Objects with glossy or irregular surface often reflect the light emitted
from the sensor in different directions. This phenomenon often leads
to false detection. For such objects, a foreground suppression sensor
(FGS) or a polarized retro-reflective sensor is the sensor of choice.
For applications that do not have space for a reflector, the FGS is
ideal.
FGS sensors accomplish reliable detection by not detecting the
object directly. An FGS sensor uses a background, as a retro-reflec-
tive sensor would use a reflector, to reliably detect any object that
passes between itself and the background. FGS uses the position on
which the light reflected from the background strikes its receiver as a
point of reference (see the diagram at right.) A change in switching
state occurs when the light strikes the receiver at a different position.
Any object that passes between the sensor and the background will
reflect the light onto the receiver in a position that will be different
from the point of reference (reflection from the background).
To ensure reliable foreground suppression, a minimum separation
distance between the set distance and the background as well as a
minimum separation distance from the target to the set distance is
recommended. Please refer to the “Hysteresis vs. Sensing Distance”
graph in the Engineering section of this data sheet to determine the
minimum separation distance.
4
Distance-settable Photoelectric Sensor
E3Z-LS
Background Suppression Optical Configuration
Example: A target that has a reflectivity that is similar to a black
paper is set to a maximum set distance of 160 mm. Based on the
“Hysteresis vs. Sensing Distance” graph, the hysteresis is 5%. The
recommended minimum separation distance in this case is 8.0 mm
(5% of 160 mm) between the background and the set distance, and
8.0 mm between the set distance and the background. This means
that the background must be at least 8.0 mm behind the set distance,
and the set distance must be at least 8.0 mm behind the target.
Foreground Suppression Optical Configuration
Emitter
Emitter
Near
Near
Far
Far
Emitting Lens
Emitting Lens
Receiving
Receiving
Lens
Lens
160 mm
Target A
Target A
Separation
Distance
8 mm
Set Distance
Separation
Separation
8 mm
8 mm
Distance
Set Distance
Distance
Background
Background