Allen-Bradley 845-MW-A-1 Measuring Wheel Encoder Accessory

Allen-Bradley 845-MW-A-1 Measuring Wheel Encoder Accessory is a Bulletin 845 accessory that attaches to compatible 845 encoders to convert linear motion into encoder pulses, enabling displacement or speed feedback from a rolling wheel. The assembly includes a measuring wheel paired with a rubber O-ring to provide a durable contact surface that engages the monitored surface as it travels, feeding precise movement data into the encoder system. This accessory is designed for use alongside the 845 encoder family to extend their measurement capabilities in applications where a physical surface is tracked—common in belt or web-process environments and other continuous-motion workflows that rely on incremental position feedback. By integrating a dedicated wheel interface with the existing 845 encoder hardware, the 845-MW-A-1 helps maintain consistent contact conditions and repeatable signal generation, which is essential for accurate motion measurement and control in industrial settings. Listed under part number 845-MW-A-1, it is commonly specified for replacement or upgrade scenarios within the 845 encoder accessory lineup.