UOM(HJ) 4L / UOM(HJ) 41L SIL 2 U-ONE Basic Unit


UOM(HJ) 4L / UOM(HJ) 41L SIL 2

U-ONE Generation I – basic unit

System solution U-ONE

  • Ø 20 mm Hollow shaft and Ø 14 mm solid shaft (flange or foot mounting)
  • Disturbance free FOC signal transmission to function modules
  • Resolution (12 bit singleturn / 12 bit multiturn)
  • Options: SIL 2 / PL d certification for speed monitoring (UOM(HJ) 41L), isolated ball bearing (hollow shaft)

U-ONE Generation I – basic unit

The compact basic units of the universal encoder systems are part of the first generation of this group of products. They sense and monitor speeds and positions. This solution sees the function modules housed in the switchboard, which makes them particularly compact to attach to the shaft. Disturbance free signal transmission is guaranteed per fiber optic cable, even over longer distances. The basic units are suitable for use both in new systems as well as for upgrade solutions. No additional mechanical components such as transfer gearbox, transfer couplings or speed step-up gearing are required to facilitate direct attachment. The systems are optionally certified for safety integrated speed monitoring up to SIL 2 / PL d.

Technical Data


Supply voltage 12-30 VDC
  • Multiturn 12 bit (4096 rotations)
  • Singleturn 12 bit (4096 steps per rotation)
Switching outputs Via function module in the switchboard
Signal outputs/Interfaces Via function module in the switchboard
Maximum rotation
  • Solid shaft: up to 3000 rpm
  • Hollow shaft: up to 2000 rpm
Electrical connection Terminal box with 2x ST connectors FOC (50/125 µm or 62.5/125 µm) + clamp (supply voltage)
Construction type / Ø shafts
  • Solid shaft (B5, B35) / Ø 11 mm, Ø 14 mm with feather key
  • Hollow shaft / Ø 20 mm with keyway
Device temperature range -25 °C to +85 °C
Degree of protection Up to IP66
Weight Approx. 2.5 kg
Device options
Mechanical options
  • Additional foot (solid shaft construction type)
  • Isolated ball bearing (hollow shaft construction type only)
  • MI: Saliferous environment
  • Hollow shaft devices: Torque bracket (on request)
Special features and certificates
  • UOM 41L and modules UO-EM-D41, UO-EM-EGS 41: SIL 2 (DIN EN 61508); PL d (DIN EN ISO 13849)
  • UL/CSA



UOM 4L / UOM 41L (de/en)


Simplifying Cranes (de/en)


UOM 4L (en)
Operating and assembly instructions


UOM 41L (en)
Operating and assembly instructions


UOM 41L-System (de/en)
EU declaration of conformity


UOM 4L-System (de/en)
EC declaration of incorporation


SIL 2 PL d


UL / CSA (de/en)


SIL 2 PL d