Correct Use

Cross-Talk Prevention

When photoelectric sensors are installed next each other, operation of a sensor may become unstable affected from light from another sensor.
In this situation, avoid interference with the measurements listed below.

  • Use interconnection models of fiber-optic sensors.
  • Separate the sensors not to get interfered, referring to a interference characteristic chart.
  • Add a slit or polarizing filter on through-beam sensor.
  • Install emitters and receivers of through-beam sensors or retro reflective sensors and reflectors in opposite orders.

* Pay attention that reflected light from an object of sensor does not enter to a receiver of next sensor.

  • Cross-Talk Prevention

Influence from Ambient Illuminance

Although photoelectric sensors are designed to use modulated light to avoid influence from ambient illuminance, entrance of light from a high frequency fluorescent lamp or sunlight to the front of a sensor may cause mis operation of the sensor.

Examples of Illuminance

Clear-sky sunlight 100,000lx
Cloudy-sky sunlight 30,000lx
Factory and office lighting 400~1,500lx

Installation

Type Problems Solutions
Through-beam

Receives light reflection from a surface below

  • Photoelectric Sensors | Problems with Through-Beam Type

Place a shield to block reflected light.

  • Photoelectric Sensors | Solutions for Through-Beam Type 1

Mount the sensors at higher positions

  • Photoelectric Sensors | Solutions for Through-Beam Type 2
Diffuse reflective

Receives light reflection from a surface below

  • Photoelectric Sensors | Problems with Diffuse Reflective Type 1

Mount the sensors at higher positions

  • Photoelectric Sensors | Solutions for Diffuse Reflective Type 1

Receives light reflection from background

  • Photoelectric Sensors | Problems with Diffuse Reflective Type | Solutions for Background Reflections

1. Paint the background in black to avoid light reflection.

  • Photoelectric Sensors | Solutions for Diffuse Reflective Type | Solutions for Background Reflections 1

2. Set detection objects away from the background

  • Photoelectric Sensors | Solutions for Diffuse Reflective Type | Solutions for Background Reflections 2

3. Use a BGS distance setting sensor.

Light Axis Alignment

  • Diagram of Light axis alignment
  1. Mount an emitter and receiver on a line facing each other.
  2. Move the emitter horizontally to confirm on angles, where the receiver receives light, then place the emitter at the center of angles.
  3. Move the receiver horizontally to confirm on angles, where the receiver receives light, then place the receiver at the center of angles.
  4. Repeat the same procedures in vertical directions.

General Cautions

  • When using a switching power supply, make sure to connect its frame ground terminal to the ground.
  • Upon power on, do not use a sensor during its warm-up time, for 100ms~2s depending on a sensor model.
  • Do not place a sensor cable in parallel to or in a same cable guide with a high-voltage or power line.

Such installation may result in malfunction of the sensor caused by induction.

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