• Hollow shafts up to Ø 20 mm, solid shafts up to Ø 14 mm (flange or foot mounting)
  • Certified for safety applications up to SIL 3 / PL e
  • High signal quality, HTL, TTL, sin/cos, up to 4096 pulses
  • Options: safety certified solid or hollow shaft attachment

Robust solutions with safety certification

The extremely rugged incremental encoders FG 41 (solid shaft) / FGH 41 (hollow shaft) are specifically designed for safety applications in heavy industry. The SIL certified series offers a high level of safety up to SIL 2 / PL d (position oriented) and SIL 3 / PL e (speed oriented). The encoders are highly resistant to shock and vibration loads, with degree of protection up to IP67. Day offer a high signal quality (HTL, TTL, Sin/Cos) up to 4096 pulses to guarantee exact measurement results even in particularly harsh operating conditions such as in wet areas in rolling mills or sea air.


Supply voltage12-30 VDC
Signal amplitude-HTL or TTL
-Sin/ Cos
Pulse rate1024, 2048, 4096 – others on request.
Output signals0°, 90° and inverted signals
Reference pulse (N) without SIL / PL, with inverted signal
Maximum frequency-Solid shaft: up to 4000 rpm / HTL and TTL: 100 kHz; Sin/Cos: 500 kHz
-Hollow shaft: up to 3000 rpm / HTL and TTL: 100 kHz; Sin/Cos 500 kHz
Electrical connection-Terminal strip in a terminal box
-Fixed cable
-12-pole round connector M23
Construction type / Ø shafts-Solid shaft (B5 / B35): Ø 11 mm or Ø 14 mm
-Hollow shaft: Ø 20 mm with keyway (for shafts up to max. length: 48 mm)
Device temperature range-40 °C to +85 °C
Degree of protectionUp to IP66 / IP67
WeightApprox. 3.0 kg
Mechanical optionsAdditional foot (solid shaft, construction type B35 only)
Special features and certificates-For speed oriented safety functions SLS, SSR, SSM, SLA, SAR: SIL 3 (DIN EN 61508); PL e / category 3 (DIN EN ISO 13849)
-For position oriented safety functions SDI, SS1, SS2, SOS, SLP, SLI, SCA: SIL 2 (DIN EN 61508); PL d / category 3 (DIN EN ISO 13849)
-Suitable for wet areas in rolling mills