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Lead Contents

Indicator Operation on Photoelectric Sensor

FAQ No. FAQ00359

Primary Contents


How do the indicators on Photoelectric Sensors operate?


There is a stability indicator (green) and an incident light indicator (red). There are four operation patterns depending on the amount of incident light.


Stability Indicator

The stability indicator shows the excess gain for temperature, voltage, dust, or other changes in the environment after installation.

Incident Light Indicator

The incident light indicator shows the amount of light entering the receiver.

Indicator operation

Incident light
(See note.)
11.2 min.
Stable, light
21.0 to 1.2
Unstable, light
30.8 to 0.99
Unstable, dark
40.8 max.
Stable, dark

Note:The operating level is 1.

The following figure shows indicator operation on a graph.