The RHDi, heavy-duty incremental shaft encoder uses precision bearings, metal code disks, proprietary custom LEDs, and custom Opto-ASIC circuitry. The RHDi, heavy-duty incremental shaft encoder uses precision bearings, metal code disks, proprietary custom LEDs, and custom Opto-ASIC circuitry. It comes with standard2.6-in.-square mounting flange, and operates in temperature from -30 to 100°C. When equipped with a steel shaft, the encoder meets NEMA-3, 13, and IP54 requirements.