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CombiCODER – Flat spot detector – GEL 2475FD

Highly integrated speed sensor, vibration sensor, temperature sensor with
integrated evaluation

  • 1-/2-channel Hall effect speed sensor with integrated flat spot detection and temperature monitoring
  • Reliable detection of high rotational speeds to creeping (0 Hz to 20 kHz)
  • Reliable detection of flat spots, welds, and rail joints
  • Temperature monitoring via NTC thermistor from -55 °C to +150 °C
  • Perfect for Condition Monitoring and predictive maintenance
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Technical information

Properties

  • Speed, vibration and temperature measurement in one housing
  • Vibration measurement with state-of-the-art MEMS technology in 3 axes
  • Integrated evaluation algorithms output the severity of flat spots and welds in discrete stages via PWM signal.
  • Using multiple flat spot detectors makes it possible to detect rail joints.
  • Electrically isolated signals for reliable evaluation in different control systems
  • Configuration flexibility thanks to freely selectable cable outlet, cable protection, and connector variants
  • Type-tested according to DIN EN 50155 for safe use in railway applications
  • Fire protection is ensured by cables and cable protection in accordance with DIN EN 45545-2 up to HL3

Advantages

  • Maximum compatibility
  • Maintenance and wear-free
  • Flat spot detection works regardless of the installation position of the sensor
  • Simplest evaluation thanks to analog PWM signal
  • Parallel condition monitoring of vehicle and infrastructure
  • Maximizing efficiency of maintenance planning
  • Simple integration
  • Easy to assemble
  • Electrically isolated measuring systems
  • High signal quality

Downloads

Downloads

Product Document Languages
GEL 2475FD Technical information DE EN CN
Product information* DE/EN

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Field of application

Railroad technology and transportation

Rail vehicle industry:

  • Traction monitoring, anti-slip protection, motor speed, anti-skid protection, Automatic Train Protection, odometry

Condition monitoring in rail vehicles:

  • Automatic, objective detection and evaluation of flat spots

Dimensional drawings

All dimensions in mm [inch]

Technical data

Display of signal patterns

Signal pattern E-

1 channel

Signal pattern V-

2 channels, 90° phase offset

Signal pattern EM

1 channel with standstill voltage

Signal pattern VM

2 channels, 90° phase offset, with standstill voltage

Signal pattern

E-

V-

EM

VM

Electrical data

Supply voltage UB(reverse polarity protected)

10 to 30 V DC

10 to 20 V DC

Current consumption IB(without load)

≤ 30 mA

 ≤ 25 mA

Output signal (short-circuit-proof)

Square-wave signals

Output signal level High

≥ UB - 1.5 V

 ≥ UB - 1.8 V

Output signal level Low

≤ 1.0 V
≤ 1.5 V

Output current per channel

≤ 20 mA
≤ 10 mA

Frequency range

0 to 20 kHz

0 to 8 kHz

Duty cycle

50% ± 20%

Phase offset

-

typ. 90°

-

typ. 90°

Electrical data PWM signal

Supply voltage UB(reverse polarity protected)

10 to 30 V DC

Output signal level High

≥ UB - 1.5 V

Output signal level Low

≤ 1.0 V

Output current

≤ 20 mA

Frequency

1 kHz

Electrical data NTC thermistor

Measuring resistor

1 to 100 kΩ at 25 °C

Measuring range

-55 °C to +70 °C (max. 100 mW)
-55 °C to 150 °C (max. 1 mW)

Measurement tolerance

1 % at 25 °C

Mechanical data

Sensor tube material		 Stainless steel
Flange material Stainless steel
Sensor weight (incl. 2 m cable) 500 g

Environmental tests

Working and operating temperature

-40 °C to +120 °C

Storage temperature

-40 °C to +120 °C

Dielectric strength

500 V AC/750 V DC (DIN EN 50155:2022-06)

Electromagnetic compatibility

DIN EN 50121-3-2:2017-11

Degree of protection on measuring side

 IP 68

Vibration resistance

DIN EN 61373:2011-04 cat. 3

Shock resistance

DIN EN 61373-2011-04 cat. 3

Fire protection

DIN EN 45545-2:2023-12
NFPA 130 upon request

MTTF value (speed)

2,000,000 h at 55 °C

MTTF value (flat spot)

950,000 h at 55 °C