AL… 40 Singleturn Looper


AL… 40 Singleturn Looper

Extremely robust singleturn absolute encoders for loopers

ALS 40, ALPA 40
  • 14 mm solid shaft (flange or foot mounting)
  • Service life extended many times under the most extreme of operating conditions
  • High signal quality, up to 16 bit singleturn, variety of interfaces
  • Options: Incremental output

Absolute encoders Incremental encoders

Singleturn absolute encoders for rough conditions

Looper encoders AL…40 are absolute encoders designed for the most extreme conditions with shock loads up to 450 g. They are mostly deployed in roll stands in hot rolling mills between the roll housings where they subject to high levels of energy. They supply precise information about the angle position of the looper, which is used for the highly dynamic feedback speed control of the rollers. At the same time the AL…40 reach a service life many times longer than other models. Lubricated with special grease their ball bearings offer an approximately 40 per cent higher load rating.

Technical Data

Supply voltage 12-30 VDC
Resolution Singleturn max. 16 bit (65536 steps per rotation)
Number of interfaces 1
Interface/Product Name
  • SSI (Gray; Binär; Inkremental)  |  ALS 40
  • Parallel  |  ALPA 40
  • HTL,TTL  |  FGL 40
Maximum rotation Solid shaft: up to 4000 rpm
Electrical connection
  • Terminal strip in a terminal box
  • Fixed cable
Construction type / Ø shafts Solid shaft (B5, B35): Ø 11 mm, Ø 14 mm with feather key
Device temperature range -25 °C to +100 °C
Degree of protection IP66 / IP67
Weight Approx. 3.5 kg
Device options Preset function (preset 1000)
Mechanical options
Special features and certificates
  • Ball bearings with 40% higher load rating, strengthened shaft
  • UL/CSA



AL… 40 (de/en)


A… 40 / 41 / 60 (de/en)


A… 40 / 41 / 60 (en)
Inquiry forms


ALS 40 (en)
Operating and assembly instructions


AS… / AM… / AL… 40 (de/en)
EC declaration of incorporation


UL / CSA (de/en)