The POSIROT PRAS20 and PRAS21 Series of magnetic rotary sensors from ASM Sensors Inc., Elmhurst, IL, use an external position magnet to provide an absolute position output over a 0°–360° measurement range and are for use in the medical equipment industry. The sensors may be ordered with smaller measurement ranges in 15° increments. Output is an analog 0.5–4.5 V signal; the PRAS20 also offers 0.5–10 V and 4–20 mA outputs with an optional redundant output. The PRAS21 Series is <0.25 in. high, is rated IP60, has a fully potted circuit board, and has resolution of 0.03% F.S. (60°–360°) and 0.1% F.S. (15°–45°, repeatability of ±0.03% (60°–360°) and ±0.1% (15°–45°), and linearity of ±0.5% F.S.
ASM Sensors Inc.