The RLK28-8-H-2000-IR-Z/31/116 represents a specific model within the broad category of industrial photoelectric sensors. These devices are fundamental components in automation, serving as non-contact detection solutions for presence, absence, or positioning of objects. The model number itself encodes key specifications about the sensor's capabilities.
Photoelectric switches operate by emitting a beam of light, typically infrared, visible red, or laser, and detecting changes in the received light signal. The RLK28-8-H-2000-IR-Z/31/116 utilizes an infrared light source, as indicated by the "IR" in its designation. Infrared light is commonly used for its insensitivity to ambient visible light and its effectiveness over moderate distances. The core principle involves the transmitter projecting this light beam towards a receiver. When an object interrupts or reflects this beam (depending on the sensing mode), the receiver detects the change and triggers an electrical output signal.
Decoding the model number provides insight into this sensor's specific features. While naming conventions can vary by manufacturer, a typical breakdown for such a sensor might include: RLK (series or product line), 28 (perhaps housing size or form factor), 8 (could indicate thread size or mounting type), H (often denotes the sensing mode, such as "through-beam"), and 2000 (frequently the sensing distance in millimeters, which would be 2 meters for this unit). The suffix "/31/116" likely refers to specific electrical output configuration (e.g., NPN or PNP transistor output), connection type (e.g., cable or connector), and voltage range. It is critical to consult the official manufacturer's datasheet for the precise and authoritative interpretation of all parameters.
The "H" in the model name strongly suggests this is a through-beam (also called opposed) sensor. In this configuration, the transmitter and receiver are housed in separate units placed opposite each other. The object to be detected passes between them, breaking the light beam. This mode offers the longest possible sensing range and high reliability, as it is less susceptible to the object's color, surface finish, or reflectivity. The stated 2000mm (2-meter) range is well-suited for through-beam applications.
Key technical characteristics of a sensor like the RLK28-8-H-2000-IR-Z/31/116 would typically include an operating voltage range (e.g., 10-30V DC), a defined output type (like a 3-wire DC NPN normally-open transistor), a switching frequency, environmental protection ratings (such as IP67 for dust and water resistance), and a housing material designed for industrial durability. The infrared light source usually operates at a modulated frequency to enhance immunity to interference from ambient light, including sunlight or factory lighting.
Applications for this type of through-beam photoelectric sensor are extensive across manufacturing and logistics. Common uses include object detection on conveyor belts for counting or sorting, monitoring entry/exit points on automated machinery for safety or process control, checking for the presence of materials in packaging machines, and verifying the position of components in assembly lines. Its 2-meter range allows it to monitor wider conveyors or gates.
When installing and operating the RLK28-8-H-2000-IR-Z/31/116, several best practices ensure optimal performance. Precise alignment of the separate transmitter and receiver units is paramount for through-beam sensors; misalignment can cause failure to detect or unstable operation. The sensor should be mounted securely to prevent vibration from disturbing this alignment. For the infrared version, it is important to consider that certain materials, like transparent plastics or thin black objects, may be more challenging to detect reliably compared to opaque materials. Regular lens cleaning is also recommended to prevent dust or grime from attenuating the light signal.
In summary, the RLK28-8-H-2000-IR-Z/31/116 photoelectric switch is a through-beam infrared sensor designed for reliable long-range object detection in demanding industrial environments. Its specific model code details its physical design, sensing mode, range, and electrical characteristics. Understanding these specifications is essential for proper selection, integration, and maintenance within automated systems, contributing to enhanced efficiency, safety, and process reliability.
