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 on wheels
Temperature monitoring via NTC thermistor from -55 °C to +150 °C
Perfect for Condition Monitoring and predictive maintenance

Inquiry & Support

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

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

Registration required

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

Cable outlet straight

Cable length L is determined by type code

Cable outlet at side

Cable length L is determined by type code

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 U_B(reverse polarity protected)	10 to 30 V DC		10 to 20 V DC
Current consumption I_B(without load)	≤ 30 mA		≤ 25 mA
Output signal (short-circuit-proof)	Square-wave signals
Output signal level High	≥ U_B - 1.5 V		≥ U_B - 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 U_B(reverse polarity protected)	10 to 30 V DC
Output signal level High	≥ U_B - 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 kOhm 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

CombiCODER – Flat spot detector – GEL 2475FD

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

Technical information

Properties

Advantages

Downloads

Downloads

Field of application

Railroad technology and transportation

Rail vehicle industry:

Condition monitoring in rail vehicles:

Dimensional drawings

Cable outlet straight

Cable outlet at side

Technical data

Display of signal patterns

Signal pattern E-

Signal pattern V-

Signal pattern EM

Signal pattern VM

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