GEL 15x
GEL 15XF
GEL 15xSSI
GEL 235
GEL 2035
GEL 2310
GEL 235 Accessories

GEL 8110
GEL 8115
GEL 8130
GEL 8135
GEL 8140
GEL 8180
GEL 8190
GEL 8310
GEL 8610

GEL 207
GEL 208
GEL 209
GEL 219
GEL 260
GEL 293
GEL 27xx

GEL 212
GEL 213
GEL 214

GEL 176
GEL 177
GEL 220

GEL 2432
GEL 2442
GEL 2443
GEL 2444

GEL 8810
GEL 8819

Programmable Preselect Counter GEL 104

GEL 247
GEL 248
GEL 2471
GEL 2472
GEL 2474
GEL 2477
GEL 2478

Temperature Sensor Gel 2161
Test Device for Minicoder GEL 210K
Test Device GEL 210TX
Accessories

General Information

• Contactless measurement of rotational movements
• Magnetic measurement principle for scanning wheel targets
• Can be uses under very harsh conditions
• Detetction of very slow movements from 0 Hz to 25 kHz
• Compact mounting dimension

Main Features

• Large air gap up to max. 3 mm (depends on the target module)
• Module range from m = 1.0 to 3.5 (D.P. = 25.4 - 7.3)
• Simple flange-mounting
• Robust stainless steel casing
• Customized cable fittings
• Protection class IP 68
• Wide temperature range –40 °C to +120°C
• High electromagnetic compatibility

Fields of Application

• Rail vehicles
- Traction control
- Wheel slip prevention
- Motor speed
• Automation
- Measurement of speeds and positions in machines and motors

Output signals

Single square-wave signals as

• Voltage output
• Current output 7 mA/14 mA

Technical Data

	E-	EI	EM
Supply voltage VS, reverse polarity protected	10 ... 30 V DC	10 ... 20 V DC
Current consumption IS without load per channel	≤ 30 mA	-	< 12 mA
Output signals (short circuit-proof)	≤ 50 mA
Output signal (short circuit-proof)	square-wave signal
High level Low level	UB - 1.0 V < 1.0 V at 120 °C, 30 VDC, 20 mA	14 mA nominal 7 m A nominal	UB - 1.8 V < 1.5 V at 85 °C, 14 VDC, 10 mA; 7 V ± 0.3 V at frequencies below 1 Hz ± 0.3 Hz
Output current max.	< 20 mA	16 mA	10 mA
Signal frequency	0 ... 25 kHz	1 ... 8 kHz
Duty (depending on measuring scale and air gap	50 % ± 5 %	50 % ± 10 %
Slew rate (with 2 m cable)	≥ 10 V/µs	≥ 6 V/µs (RB = 560Ω)	≥ 4 V/µs
Cable length max.	100 m
Electromagnetic compatibility (EMC)	rail vehicles: EN 50121-3-2 industry applications: EN 61000-6-1 to 4
Insulation strength according to EN 60439-1	500 V
Target wheel module	m = 1.0 ... m = 3.5		m = 2.0
Air gap depending on the module m = 1.0 m = 1.5 m = 2.0 m = 2.5 m = 3.5	0.2 ... 1.4 mm 0.2 ... 1.8 mm 0.2 ... 2.2 mm 0.2 ... 2.8 mm 0.2 ... 3.0 mm		0.2 ... 1.5 mm
Operating and ambient temperature range	-40°C ... +120°C		-40°C ... +85°C
Protection class	IP 68
Vibration and shock resistance	EN 61373 cat. 3
Type test	in compliance with EN 50155
Width of target wheel	≥ 10 mm ((smaller on request)
Material of target wheel	ferromagnetic steel
Form of target wheel	involute teeth according to DIN 867 or rectangular teeth 1:1 or slotted disk (on request) other tooth forms on request
Weight	< 650 g with 2 m cable
Housing	stainless steel
Cable halogen free and screened	6 x 1.0 mm2 diameter 8.2 mm bending radius fixed 24 mm / flexing 41 mm	4 x 1.0 mm2 diameter 8.3 mm bending radius fixed 25 mm / flexing 42 mm	3 x 0.5 mm2 diameter 6.3 mm bending radius fixed 19 mm / flexing 32 mm

* Depending on target tooth form and air gap
** Conversion from module (M) to diametric pitch (D.P.) D.P. = 25.4 over M

Signal Level

Voltage output (2474E-)







When using the current output, the resistor to be connected must not exceed a specific value:

R_B,max = (V_S – 4 V) / I_max
with V_S = 10 … 20 V DC and I_max = 16 mA

Example for V_S = 15 V:
R_B,max = 11 V / 16 mA = 690 Ω

Dimensional drawing

Assembly drawing

Example for customized cable connections

Encoder end



Cable End

Pin layout, Type code

Pin layout



Type code GEL 2474




Special variant

Rail speed sensors marked GEL 2474 Y ... are variants based on the standard sensors in this document. For details of the variation refer to the variant-specific drawing and or specification.

Lenord & Bauer: Rail Speed Sensors & Rotary Pulse Encoder