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GEL 2474 - 1 or 2 Channel Speed Sensor



General information

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

Features

  • Module target wheel 1.00 to 3.50
  • Measuring range 0 Hz to 25 kHz
  • Temperature range -40 to +120 °C
  • Protection class IP 68
  • Type test according to EN 50155

Advantages

  • Low lifecycle costs for end customer due to high reliability
  • Place-saving sensor in a compact design
  • Increased sensing distance (air gap up to 3 mm, depending on module of target wheel)

Fields of application

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


Technical Data


Signal pattern E- EI EM V-
Electrical data
Supply voltage VS (reverse polarity protected) 10 to 30 VDC 10 to 20 VDC 10 to 30 VDC
Current consumption IS (without load) ≤ 30 mA - < 12 mA ≤45 mA
Output signal (short-circuit proof) Square-wave
Output level high (1) VS - 1.0 V typ. 14 mA VS - 1.8 V VS - 1.5 V
Output level low (1) ≤ 1 V typ. 7 mA ≤ 1.5 V (2) ≤ 1.5 V
Max. output current per channel ≤ 20 mA ≤ 16 mA ≤ 10 mA ≤ 20 mA
Input frequency target wheel 0 Hz to 25 kHz 1 Hz to 8 kHz 1 Hz to 25 kHz
Duty cycle
(depends on measuring scale and air gap)		 50% ± 5% 50% ± 10% 50% ± 5%
Phase shift - typ. 90°
Slew rate (with 2 m cable) ≥ 10 V/µs ≥ 6 V/µs
(RL = 560 Ω)		 ≥ 4 V/µs ≥ 10 V/µs
EMC Rail vehicles: EN 50121-3-2
Industry applications: EN 61000-6-1 to 4
Insulation strength (DIN EN 60439-1) 500 V
Mechanical data
Module m of target wheel: 1.0 to 3.5 (DP: 25.4 to 7.3) 2.0 (DP: 12.7)
Permissible air gap (for module m)
m = 1.00
m = 1.50
m = 2.00
m = 2.50
m = 3.50

0.2 to 1.4 mm
0.2 to 1.8 mm
0.2 to 2.2 mm
0.2 to 2.8 mm
0.2 to 3.0 mm
 0.3 to 1.5 mm 0.2 to 2.2 mm
Width of target wheel ≥ 10 mm (smaller ones on request)
Form of the target wheel Involute gear as per DIN 867, rectangular gear 1:1 or slotted disk (on
request)
Material of target wheel Ferromagnetic steel
Operating and ambient temperature -40°C to +120°C -40°C to +85°C -40°C to +120°C
Storage temperature -40°C to +120°C
Protection class IP 68
Vibration and shock resistance EN 61373 Cat. 3
Type testing EN 50155
Sensor housing material Stainless steel
Weight (with 2 m cable) 650 g
Electrical connection
Cable Cable non halogen and screened (specifications on request),
cable outlet straight
Cable length ≤ 100 m
Cable diameter 8.2 mm 8.3 mm 6.3 mm 8.2 mm
Cable cross section 6 x 1.0 mm2 4 x 1.0 mm2 3 x 0.5 mm2 6 x 1.0 mm2
Bending radius static / dynamic 24 / 41 mm 25 / 42 mm 19 / 32 mm 24 / 41 mm



Signal pattern,
Electrical connection


Voltage output (1 channel)

Signal pattern E: VS = 10 to 30 V DC

Voltage output (2 channels)

Signal pattern V: VS = 10 to 30 V DC

Voltage output with standstill voltage (1 channel)

Signal pattern EM: VS = 10 to 20 V DC

Current output (1 channel)

Signal pattern E: UB = 10 to 20 V DC
Key
1, 2 = channel 1, channel 2
VS = supply voltage



Electrical connection


Signal Voltage output Standstill voltage Current output
E V EM EI
Channel 1 yellow yellow blue
Channel 2 white white
GND (0 V) blue blue black
+VS red red red red
Cable/screen 1 / 1 1 / 1 1 / 1 1 / 1

for signal pattern E- / V-: VS = 10 to 30 V DC
for signal pattern EI / EM: VS = 10 to 20 V DC



Signal level


Voltage output

for signal pattern E- (without standstill voltage)
for signal pattern V

Voltage output with standstill voltage

for signal pattern EM

Current output

for signal pattern EI
When using the current output, the resistor to be connected
must not exceed a specific value:
RB,max = (VS-4 V) / Imax
with VS = 10 to 20 V DC and Imax = 16 mA
Example for VS = 15 V:
RB,max = 11 V / 16 mA = 690 Ω



Assembly drawing


Assembly drawing



X  Bevelling
d  Permissible air gap
    0.7 mm
1  Mounting screw (recommended:
    M8 x 20, EN ISO 4762)
2  Sealing ring (21 x 2.5 mm;
    NBR)
3  Visible surface (target wheel
    rotating forwards)
4  Index pin
   (only for signal pattern V)
5  Axial offset
6  Direction of rotation of the
    target wheel (forwards)


Drilling plan (top view)
A  for signal pattern E
B  for signal pattern V







Signal for forward drive
for signal pattern V



Please observe the EMC-reference in the operating instructions!


Type code,
Dimensions



Type code GEL 2474


Notes: For a special customized version a Y-No. will be created. A special version 2474Yxxx is manufactured according
to a drawing or application description and could differ from the technical standard specification.

Dimensions GEL 2474




A Screwed cable gland M20 x 1.5
B Flexible conduit connection with nominal width of 12 mm
C Hose connector piece with nominal width of 18 mm
  l Cable length
  1 Sealing ring 21 x 2.5 mm
Approximate dimension




Example for customized cable connections


Encoder end

Cable end