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Questions You Should Know about Banner Photoelectric Sensor

Mar. 03, 2025

What is a Photoelectric Sensor? How Can it Benefit Your Facility?

There are several industrial applications, especially within manufacturing where the distance, absence or presence of an object needs to be measured. A photoelectric sensor is used for such purposes.

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A photoelectric sensor is a position sensing device that uses a modulated light beam to detect its target. The absence or presence of the target is dependent on the reflection of the light beam.

The simplest example of a photoelectric sensor in use is at the entrance of a grocery store, where the glass door opens as soon as the customer walks in front of it.

A photoelectric sensor makes use of modulated light, which is pulsed at a specific frequency between 5 & 30 kHz. A modulated light is used as it reduces the chances of ambient light affecting the sensor&#;s performance. LEDs are usually used as sources.

There are three types of models for photoelectric sensors:

Reflective Model:

In such a model, the light transmitting a, as well as the receiving element,re housed in the same enclosure.

This model separates the transmitter and the receiver. The presence of an object is recorded whenever the contact between the transmitter and the receiver is broken.

Retroreflective Model:

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Both the transmitting and the receiving elements are contained within the same housing. This time constant contact is maintained between the two through a reflector. Whenever this contact is broken by an object, presence is recorded.

The Q4X Series Rugged All Purpose Photoelectric Sensor

This photoelectric sensor solves many challenging applications and comes in a rugged IP69K rating with a FDA food-grade stainless steel casing. Check out the video below!

Several environments, especially industrial ones are wrought with contaminants including dust, smoke, moisture, dirt, etc. A sensor that operates in such conditions is prone to registering false positives and therefore requires more light for proper operation. System engineers should always be clear as to what the requirements are, and select the appropriate sensor after due diligence.

Do I need a Reflector for my Photoelectric Sensor - DigiKey Forum

We are often asked whether or not a particular sensor such as the DX80N9Q45LP from Banner Engineering Corporation need a reflector to operate.

Photoelectric sensors use light to detect the presence or absence of an object within the sensor&#;s field of view. Whether or not your sensor needs a reflector to operate depends on which type of sensor you are looking at purchasing.

There are three main types of photoelectric sensors:

Through-Beam Sensors: Through-beam sensors use a separate emitter and receiver. The emitter releases a beam of light that travels straight to the receiver, typically creating a normally closed circuit. If the beam of light is blocked by an object the circuit switches to an open circuit. The through-beam sensors can detect objects over long distances but require careful placement and alignment to ensure proper operation. Clear objects may not be detected by this type of sensor.

Retroreflective Sensors: Similar to the through-beam sensors these sensors use an emitter and a receiver to send and detect a beam of light, however both the emitter and receiver are contained within the same unit. For proper detection of objects retroreflective sensors require a reflector be mounted directly across from the sensor. Like through-beam sensors these are typically normally closed circuits and switch to normally open circuits when an object is detected. Retroreflective sensors have a shorter range than through-beam sensors and may not detect shiny objects because they reflect the light back similar to the way the reflector does.

Diffused Sensors: Similar to retroreflective sensors the emitter and receiver in a diffused sensor are housed within the same unit. However, rather than relying on a reflector to bounce the light back to the sensor it instead uses the object itself. Their circuit typically behaves the same as the other two types of sensors. Because it uses the object to return the light, diffused sensors have the shortest range of the three and may not detect objects with less reflective surfaces.

So, back to our question above. We now know that because the DX80N9Q45LP is a retroreflective sensor it does require a reflector for proper operation.

Contact us to discuss your requirements of Banner Photoelectric Sensor. Our experienced sales team can help you identify the options that best suit your needs.

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