Product Description:

The AI2512122B120 is an absolute optical rotary encoder produced by Danaher within the Dynapar Encoders series. As a feedback element, it converts shaft angle into a unique digital code so motion controllers retain machine position information even after a power loss. The device mounts with a 2.5-inch square flange and couples to a 3/8-inch shaft, enabling positioning, indexing, and speed-monitoring functions on automated packaging lines, robotic joints, and material-handling axes.

It accepts a flexible supply of 10–30 VDC, and its electronics consume only 250 mA, allowing the encoder to share low-voltage rails with other sensors. The absolute accuracy is ±0.01° mechanical, indicating the maximum difference between the reported and actual shaft angles over one full revolution. Short-term stability is tighter, with a repeatability of ±0.002° mechanical, which allows the encoder to return the same reading when the shaft returns to a previous position. The optical code disc provides a resolution of 12-bit ST and 12-bit MT, yielding 4,096 single-turn increments and 4,096 turn counts for multi-turn position tracking. Starting torque remains below 1.4 in-oz, minimizing mechanical drag and reducing the load placed on small servo or stepper motors.

The housing has an IP67 protection rating, sealing the optical components against dust ingress and temporary immersion for use in washdown or outdoor machinery. Reliable operation is supported at ambient temperatures from -40 to +85 °C, while storage is permitted between -40 and +100 °C without damage to the code disc or electronics. The stainless steel shaft supports continuous rotational speeds of 10,000 rpm and can reach a momentary peak of 12,000 rpm during acceleration, allowing the encoder to track high-speed spindles without overspeed failure. With a mass of 400 g, the encoder adds little weight to the assembly, while its square flange supports accurate alignment and consistent position feedback.