FG 41 SIL 3 / FGH 41 SIL 3 Incremental encoders


FG 41 SIL 3 / FGH 41 SIL 3

Incremental encoders

  • 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

Incremental encoders

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.

Technical Data

Supply voltage 12-30 VDC
Signal amplitude
  • HTL or TTL
  • Sin/Cos
Pulse rate 1024, 2048, 4096
Output signals 0°, 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 protection up to IP66 / IP67
Weight Approx. 3.0 kg
Device options
Mechanical options
  • Additional 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
  • Saltwater-proof



FG(HJ) 40 / 40 Ex / 41 / INOX (de/en)


FG … (en)
Inquiry forms


FG 41 (en)
Operating and assembly instructions


FGH 41 (en)
Operating and assembly instructions


SIL 2 PL d / SIL 3 PL e