The A&D AD-4421 is a professional-grade weighing indicator and controller engineered to meet the demanding requirements of high-speed automatic production lines. As the central intelligence for automatic checkweighers and sorting systems, the AD-4421 delivers the perfect balance of speed, accuracy, and connectivity, ensuring that every product on your line meets strict weight specifications.

High-Speed Performance for Dynamic Lines

The core strength of the AD-4421 lies in its ultra-fast sampling rate of 1000 times per second. This high-speed A/D conversion allows the controller to accurately measure the weight of objects as they rapidly pass over a load cell, filtering out mechanical vibrations and noise that typically plague dynamic weighing systems. This results in highly reliable "Pass/Fail" decisions even at throughputs of hundreds of pieces per minute.

Advanced Automatic Control Logic

Specifically designed for automation, the AD-4421 features built-in logic for various automatic weighing sequences. It can manage "Auto-Zero" tracking, "Dynamic Filtering" to smooth out weight readouts, and multi-stage sorting outputs (e.g., Underweight, OK, Overweight). The unit includes high-speed relay inputs and outputs that can directly trigger rejectors, flippers, or alarm lights without the latency of a separate PLC in many simpler configurations.

Key Features

• Precision Digital Filtering: Advanced algorithms minimize the impact of machine vibration, ensuring stable readings during conveyor movement.
• Compact Design: Small footprint allows for easy integration into existing control panels or weighing cabinets.
• Bright VFD Display: The Vacuum Fluorescent Display provides excellent visibility in all lighting conditions, with a dedicated bar graph for target deviation.
• Industrial Connectivity: While RS-232C is standard, the modular design supports various fieldbus options to integrate seamlessly into factory-wide SCADA or ERP systems.
• Durability: The IP65-rated front panel ensures protection against dust and moisture, making it suitable for food and pharmaceutical packaging environments.

Typical Applications

• Automatic Checkweighers: Verifying the weight of packaged goods (bottles, boxes, bags) at high speed.
• Weight Sorting: Classifying products into different grade categories based on precise weight thresholds.
• Loss-in-Weight Feeding: Controlling the rate of material discharge in industrial processing.
• Filling Machines: Providing high-speed feedback to shut off valves once a target weight is reached.