AC/DC Photoelectric Sensor | E3JK Relay Output | Diffuse Reflection

The GTRIC E3JK sensor is for finding objects in factories. It's a diffuse reflection sensor, so it doesn't need a separate reflector. It takes 24-240V AC or DC power. This makes it easy to install with different power sources. Features and Benefits - Universal 24-240V AC/DC input - This makes ordering and installing simpler. It works with almost any power supply in your building. - Direct relay output - It can switch small loads directly. These include indicator lights or actuators. This means you might not need an extra PLC or relay. - Adjustable sensitivity dial - You can fine-tune the detection range. This helps it reliably sense different materials while ignoring background surfaces. - Bright LED status indicators - Two large lights show power and output status. This helps you quickly confirm it's aligned and working right. Applications - Finding vehicles to open automatic gates or garage doors. - Checking fill levels of opaque materials in hoppers and silos. - Starting and stopping conveyor belts as packages go by. How They Work A photoelectric sensor detects the presence or absence of an object by emitting a light beam and measuring changes in the received light. The AC/DC Photoelectric Sensor uses diffuse reflection, meaning the emitter and receiver are in a single housing. The sensor emits light, which then reflects off the target object and returns to the sensor's receiver. If an object breaks the light path or reflects light back, the sensor's internal relay output is triggered, indicating detection. This method is effective for various materials and surface finishes. 3 Main Types of Photoelectric Sensors Photoelectric sensors are broadly categorised by their sensing method. The three main types are diffuse reflective, retro-reflective, and through-beam. This AC/DC Photoelectric Sensor is a diffuse reflection type, where the light source and receiver are in one unit, detecting objects directly reflecting light. Retro-reflective sensors use a reflector to bounce light back, detecting objects that interrupt this beam. Through-beam sensors have separate emitter and receiver units, detecting objects that break the direct light path between them. Common Applications Photoelectric sensors are widely used for object detection, counting, and positioning in various industrial and commercial settings. For example, they are frequently employed on conveyor belts to detect product presence, ensuring items are correctly aligned or counted as they pass. In automated systems, they can confirm the closure of safety gates or the correct positioning of machinery parts. The E3JK model, with its relay output, is suitable for direct control of contactors or other switching devices in many such applications. The Core Components Every photoelectric sensor, including this AC/DC Photoelectric Sensor, comprises several essential components. An emitter generates a light beam, typically infrared or visible red light. A receiver then detects this emitted light. The AC/DC Photoelectric Sensor uses a diffuse reflection principle, so both the emitter and receiver are housed together. An internal circuit processes the received light signal, and an output stage provides the electrical signal, in this case, a relay output, to indicate detection or non-detection of an object. The 3 Main Operating Modes Photoelectric sensors operate in three primary modes: light-on, dark-on, and normally closed. In light-on mode, the output is active when the sensor detects light. Conversely, in dark-on mode, the output is active when no light is detected by the receiver. The E3JK Relay Output sensor, depending on its configuration, can be set to either light-on or dark-on. A normally closed mode means the output is active when no object is detected and deactivates upon detection. These modes allow flexibility in how the sensor reacts to an object.