Incremental optical encoders, safety certified (SIL 3, PL e)

FG 41 SIL 3 / FGH 41 SIL 3

  • 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
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Incremental optical encoders with safety certification

The extremely rugged incremental optical encoders FG 41 (solid shaft) / FGH 41 (hollow shaft) are specifically designed for safety applications in heavy industry. The SIL certified encoder series offers a high level of safety up to SIL 2 / PL d (position oriented) and SIL 3 / PL e (speed oriented). The incremental optical encoders are highly resistant to shock and vibration loads, with degree of protection up to IP67. The encoders 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


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



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