Incremental rotary encoder with flange
144 000 counts/rev, RS 422 GURLEY Precision Instruments

The Series 9x20 is a family of optical incremental encoders designed for industrialgrade
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)