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MiniCODER Basic GEL 2440



  • pointerThe measuring system comprises a scanning unit Mini-
    CODER basic and a precision target wheel
  • pointerPrecision target wheels for attachment to shafts with a
    shaft diameter from 8 mm to 130 mm are to be ordered
    Limited selection of target wheel variables available
    from stock
  • pointerMagnetoresistive sensors contactlessly scan the target
    wheel and acquire the rotational speed
  • pointerOutput signals are two 90º phase offset square-wave
    signals, their inverse signals TTL / RS 422 as well as a
    reference signal
  • pointerEquipped with integrated interpolation, internal ampli-
    fication of the sensor signals
  • pointerEvaluates the signals from the reference gap and in this
    way references the position


  • pointerOutput signal level TTL / RS 422
  • pointerFrequency range 0 to ≤ 500 kHz
  • pointerRotational speed measurement range from 0 to over
    30,000 min-1
  • pointerTemperature range -20 ºC to +100 ºC
  • pointerProtection class IP 68


  • pointerMaintenance and wear-free due to the magnetic meas-
    uring system
  • pointerSuitable for target wheels with module 0.4 or 0.5
  • pointerExtremely robust thanks to fully encapsulated electron-
  • pointerFlexible cable laying due to axial cable outlet

Field of application

  • pointerPosition and rotational speed acquisition in machine
    tool engineering


Construction and design

The measuring unit comprises a scanning unit and a measuring scale. The system does not need dedicated bearings for this task, as the measuring scale is mounted directly on the shaft. The market-optimised system operates contactlessly and is extremely compact.
Sensors, magnet and electronics are manufactured using the latest micro system technology and are fully encapsulated,as such they are particularly resistant to shocks and vibration. A further advantage of this system is that it is maintenance and wear-free and therefore reduces operating costs.

Output signals (signal pattern)

The MiniCODER basic outputs square-wave signals with TTL level. In addition, it evaluates signals from a reference gap (TG).

Signal pattern Vs Vout
TG + 5 V DC ± 5 % TTL

Vs      Supply voltage
Vout    Signal output

Reference marks

The MiniCODER basic can detect reference marks in the form of a gap. This reference pulse detected can be used for referencing the position.
The selection of the reference mark is defined by the size and rotational speed of the target wheel used, as both parameters have an effect on the forces acting on the reference mark.

Reference mark G - gap

On a target wheel a tooth is milled away over half the width of the tooth wheel. In this way there is a gap in the reference track that is detected.

Interpolation factor

The sin/cos signals generated in the encoder are interpolated and output as square-wave signals. The interpolation factors 1, 2, 4 and 8 are available. The interpolation is undertaken directly in the sensor.
On the usage of a target wheel with 250 teeth and the selection of an interpolation factor of 8, the MiniCODER basic provides 2000 square-wave signals per turn.


The module describes the relationship between the number of teeth and the outside diameter of a target wheel. Given the same number of teeth the following applies: the smaller the module the smaller outside diameter.

Air gap table

Type Module Air gap d,
preset measure
Distance tolerance
4 0.4 0.15 mm ±0.03 mm
5 0.5 0.15 mm ±0.03 mm

The MiniCODER must be ordered to suit the target wheel.

Connection type

The MiniCODER basic are supplied with a flying lead.


Connection type K - flying lead

L   Cable length (see type code)
*)  Note: as far as possible lay the cable screen so it is coaxial.

Cable length

With the connection type K (flying lead) there are 4 cable lengths available: 30, 150, 250, 600 cm.

Technical data

Electrical data
Supply voltage VS 5 V DC ± 5 %, reverse polarity protected
Current consumption ≤ 60 mA
Output level TTL / RS422
Output signal Two square-wave signals offset by 90º and their inverse
signals, short-circuit-proof; with reference pulse
Output frequency ≤ 500 kHz
Power consumption without load ≤ 0.3 W
Electromagnetic compatibility EN 61000-6-1 to 4 (1)
Dielectric strength 500 V, in accordance with EN 60439-1
Mechanical data
Permissible air gap 0.15 mm ± 0.03 mm
Width of the target wheel min. 4.0 mm
Target wheel material Ferromagnetic steel
Weight 30 g
Housing material Die cast zinc
Ambient data
Assured operating temperature range -20 ºC to +100 ºC
Operating and storage temperature range -20 ºC to +100 ºC
Protection class IP 68
Vibration resistance 100 m/s2, in accordance with DIN EN 60068-2-6
Shock resistance 1000 m/s2, in accordance with DIN EN 60068-2-27
Electrical connection
Max. permissible cable length 100 m (Pay attention to voltage drop on the supply cable)
Connection 9-core cable, core cross-section 0.15 mm2, outside diame-
ter 5-0.3 mm, min. bending radius 25 mm.

Dimensional drawing, boring and milling sketch,
installation drawing

Dimensional drawing GEL 2440 - axial cable outlet
Boring and milling sketch

Assembly drawing


Target wheels

For the measurement of rotary movements, MiniCODERs form a unit together with target wheels. The target wheel size and the related diameter depend directly on the module and the number of teeth.

Standard target wheels

Standard target wheels are available on short delivery times from stock. For specifications and designs see "Technical information ZAx / ZFx".

Terminal assignment

Terminal assignment

Core colour Signal / function TG
green V1+ Track 1 green
yellow V1- /Track 1 yellow
grey VN+ Reference track grey
white 0 V GND
brown VS + 5 V supply voltage
blue V2+ Track 2 blue
red V2- /Track 2 red
pink VN- /Reference track pink