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GEL 2477 - 2 Channel Speed Sensor


  • Speed sensor based on magnetic measurement principle
  • Maintenance- and wear-free operation due to non-contact measurement of rotation
  • Suitable for ferromagnetic target wheels
  • Safe detection of slow rotation from 0 Hz without pulse loss and for high-speed rotation up to 25 kHz
  • Two channels shifted by 90° provide the direction of rotation
  • Robust and compact stainless steel housing suitable for harsh application
  • Simple flange mounting
  • Customized cable fittings


  • Measuring range 0 Hz to 25 kHz
  • High resolution due to pulse multiplier
  • Temperature range -40°C to +120°C
  • Protection class IP 68
  • Type test according to EN 50155

Fields of application

  • Rail vehicles
    -Traction control
    -Motor speed
  • Automation
    -Measurement of speed and positions at gears, motors and roller

Output signals

  • 2-channel square-wave signals, 90°-shifted, inversed signals

Technical Data

Signal pattern V X
Electrical data
Supply voltage VS (reverse polarity protected) 10 to 30 V DC
Current consumption per channel IS (without load) ≤ 50 mA
Output signal (short circuit-proof) square-wave signals
Output signal level high(1) ≥ VS - 0.8 V
Output signal level low (1) ≤ 0.5 V
Output current per channel ≤ 20 mA
Input frequency target wheel 0 to 25 kHz
Output frequency (2) 0 to 50 kHz / 0 to 100 kHz / 0 to 200 kHz
Duty(depends on measuring scale and air gap) 50% ± 30 %
Phase shift typ. 90°
Slew rate (2 m cable) ≥ 10 V/µs
Electromagnetic compatibility rail vehicles (EN 50121-3-2) industrial applications (EN 61000-6-1 to 4)
Insulation 500 V AC (EN 60439-1)
Mechanical data
Module m target wheel 1.00 (D.P. = 25.4)
Permissible air gap 0,8 mm (0,4...1,0 mm)
Width of target wheel ≥ 10 mm (smaller ones on request)
Form of target wheel involute gear as per DIN 867, slotted disk (on request)
Material of target wheel ferromagnetic steel
Operating and ambient temperature -40°C to +120°C
Storage temperature -40°C to +120°C
Protection class IP 68
Vibration resistance EN 61373 cat. 3
Shock resistance EN 61373 cat. 3
Typ test EN 50155
Housing material sensor stainless steel
Weight sensor (2 m cable) approx. 650 g
Electrical connection Cable halogen free and screened (specification on request) cable outlet straight or on the side
Cable length ≤ 100 m
Cable diameter 8.2 mm
Cable cross section 6 x 1.0 mm2
Cable type LK1069
Bending radius static / dynamic 24 mm / 41mm

Signal pattern, Output signals
Signal level, Electrical connection

Signal pattern

V(Vs=10 to 30 V DC)
X(Vs=10 to 30 V DC)

Output signals

Output signal for factor 2

Output signal for factor 8

Signal level

Voltage output for factor 2

Electrical connection

Electrical connection for signal pattern V/X
Signal pattern V X
channel 1 yellow yellow
channel 2 white white
GND (0 V) blue blue
+Vs()10 to 30 V DC red red
Cable/screen 1/1 1/1



all dimensions in mm

Assembly drawing

Assembly drawing

Please observe the EMC-reference into the operating instruction!

Type code

Type code GEL 2477

Notes: For a special customized version a Y-No. will be created. A special version 2477Yxxx is manufactured according to a drawing or application description and could differ from the technical standard specification.

Example for customized
cable connections

Encoder end

Cable end