CDD-11N Photoelectric Sensor | Diffuse Reflection | NPN & PNP 10-30VDC

The GTRIC CDD-11N is an infrared photoelectric sensor. It detects objects by sending out infrared light and sensing when it reflects back. This optical proximity switch is made for industrial use. It has an adjustable sensing range. Features and Benefits - Sensing distance adjusts up to 40 cm - Lets you set the detection point for different products or machine setups. - NPN and PNP output types - Provides wiring options for either sinking (NPN) or sourcing (PNP) PLC inputs. - Standard M18 threaded body - Makes installation easy with common mounting brackets and hardware. - Infrared light source - Detects reliably even with ambient light or in dusty conditions. Applications - Conveyor systems to check if boxes and products are present. - Packaging machines for counting items as they pass. - Automated assembly lines to confirm a part is placed correctly. How They Work A photoelectric sensor, also known as an optical sensor or light sensor, detects the presence or absence of an object by emitting a light beam and measuring the change in the received light. The CDD-11N model uses diffuse reflection, meaning it emits light which then bounces directly off the target object back to the sensor. This type of sensor is effective for detecting various materials at an adjustable sensing distance. The sensor operates within a 10-30 VDC voltage range and provides both NPN and PNP output types, making it versatile for different control systems. 3 Main Types of Photoelectric Sensors There are three primary types of photoelectric sensors. Through-beam sensors have separate emitter and receiver units, detecting an object when it breaks the light beam between them. Retro-reflective sensors combine the emitter and receiver in one housing and use a reflector to bounce the light back; an object is detected when it interrupts this beam. Diffuse reflective sensors, like the CDD-11N, also house the emitter and receiver together, but they detect an object by the light reflecting directly off its surface. Each type suits different applications based on sensing distance and object material. Common Applications Photoelectric sensors are widely used in industrial automation for various tasks. They are commonly employed for object detection, such as confirming the presence of products on a conveyor belt or monitoring the position of machine parts. Their ability to operate within a 10-30 VDC range and offer both NPN and PNP outputs makes them adaptable to many control systems. The adjustable sensing distance of the CDD-11N allows for precise setup in tasks like counting items, detecting package orientation, or ensuring safety by identifying obstructions. The Core Components A photoelectric sensor, such as the CDD-11N, comprises several key components working together. It includes a light emitter, typically an infrared LED, which projects the light beam. A receiver, usually a phototransistor or photodiode, detects the reflected light. The sensor also features internal circuitry for signal processing, which interprets the light changes and triggers the output. The housing, made of plastic for this model, protects these internal electronics, while the NPN and PNP output types provide electrical connections for control systems. The 3 Main Operating Modes Photoelectric sensors operate in three main modes: Light ON, Dark ON, and programmable. In Light ON mode, the output is activated when the receiver detects light. In Dark ON mode, the output is activated when the receiver does not detect light. Some sensors, including those with NPN and PNP outputs like the CDD-11N, offer programmable modes, allowing the user to select between Light ON or Dark ON based on the application's requirements. This flexibility ensures compatibility with various control logic systems and simplifies installation for specific detection tasks.