The Series 9x20 is a family of optical incremental encoders designed for industrial-grade applications that require high resolution and high accuracy. The Series 920 is available in two basic models and a variety of mechanical configurations. All 920s share these features: • LED illumination for long life (100,000 hours) • Differential photo-detectors for signal stability • Single-board, surface-mount electronics for reliability • RS-422 differential line driver output for noise immunity • Zero index signal • Sealed bearings for contamination resistance (ABEC 7 in solid shaft version; ABEC 5 in blind hollow shaft version). • IP66 sealing for harsh environments (IP64 at the shaft exit) Model 9120: Resolutions up to 4500 cycles/rev (18,000 counts/rev); optional index formats; optional input voltage. Model 9220: Dual read heads for improved accuracy; monolithic integrated ASIC for internally interpolated resolutions up to 36,000 cycles/rev (144,000 counts/rev); watchdog circuit. |