incremental rotary encoder / non-contact / stainless steel

SiGNUM is Renishaw's high accuracy, non-contact 20 µm encoder system comprising of an Sr readhead and Si interface. It is sealed to IP64 and offers speeds up to 12.5 m/s and resolutions down to 5 nm and reads a variety of linear and rotary scales with IN-TRAC auto-phase optical reference marks. SiGNUM is extremely easy to use with calibration at the push of a button and free diagnostic software, yet it offers a level of performance previously available only from more delicate fine pitch encoders with an SDE of typically <±30 nm at temperatures up to +85 °C.

REXM is a one-piece stainless steel ring with 20 µm pitch incremental graduations marked directly on the periphery, featuring the IN-TRAC optical reference mark. Its larger cross-section allows for the reduction in all installation errors apart from eccentricity, which is easily corrected using a DSi (Dual Signal Interface) and two readheads. Featuring total installed accuracy up to ±1 arc second, zero coupling losses, and exceptional repeatability.
REXM is available in a range of sizes (Ø52 mm to Ø417 mm) and line counts, all of which have a large internal diameter for flexible integration. The non-contact format eliminates backlash, shaft wind-up (torsion) and other mechanical hysteresis errors that are inherent in traditional enclosed encoders.