	Photoelectric Sensors

Reading Characteristics Charts

Chart of Operating distance versus detecting distance

Operating distance vs. detecting distance

Ex. PZ-41(P)/41L(P):KEYENCE products
This graph shows the points, at various set distances, where the reflective type sensor can detect a standard target travelling perpendicular to the optical axis when the maximum detecting distance is provided. The graph is used to confirm the detecting distance of an object travelling perpendicular to the optical axis.

Chart of Excess receiver gain versus detecting distance

Receiver excess gain vs. detecting distance

EX. PZ-51(P)/51L(P):KEYENCE products
This graph shows the level of excess gain at various set distances from the sensor, under optimal sensitivity conditions, and serves to indicate the sensor setting range at specific distances. In the chart, the PZ-51(P) is provided with a range (excess gain) 5 times greater than the rated stable operating level and a detecting distance of 7 m 23.0'.
The greater the excess gain, the less disturbance the sensor receives from external conditions.

Parallel displacement of optical axis

Ex. PZ-51(P)/51L(P):KEYENCE products
This graph shows the points, at various set distances, where a receiver (reflector, if a reflective type) travelling perpendicular to the optical axis detects a light beam emitted from the transmitter. It is used to confirm the displacement of the receiver (or reflector) to its optical axis.

Chart of detecting distance versus object size

Detecting distance vs. object size

This graph shows the effect of the size of a target (white mat paper) on the detecting distance.
The area covered by the light beam can be verified for a given detecting distance. It is used to determine target size.

Detecting area

Ex. FS2-65, FU-4F:KEYENCE products
This graph shows the relationship between target diameter (copper wire) and detecting area.
For example, according to the graph a copper wire of 0.1 mm 0.04" in diameter can be detected within the shaded area.

Configuration for detecting a copper wire

Optical axis angle

Ex. PZ-51/51L(P):KEYENCE products
This graph shows the permissible angle of the receiver to the optical axis of the transmitted beam for a thrubeam type sensor.

Interference area

Ex. FS2-60, FU-65:KEYENCE products
Photoelectric sensors placed side by side may detect light beams from transmitters other than their own, causing unstable detection. The problem may be solved by separating the sensors by a specified distance.
This graph is used to determine that distance.

Hysteresis

Ex. FS2-65,FU-4F:KEYENCE products
This graph shows the level of hysteresis measured at various set distances.

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