EN

Railway Speed Sensors
MTR series: Speed sensors for railway applications
English
Product Features





Innovative screening concept (patent pending)
High insulation resistance
New sealing concept for long lifetime
IP69K tightness on sensor side
High pull out force of cable
User benefits





Superior electromagnetic immunity allows flexible installation
(e.g. closer to a traction motor than standard sensors)
Less risk of sensor damages due to differences in electric
potential
Longer lifetime
Sensor withstands high pressure wash
Less risk of damage during installation
Target applications for railways
On railways the speed signal is used for:

Traction motor feedback

Wheel slide protection (prevent wheels from not rotating)

Wheel slip protection (prevent wheels from spinning)

Speed indication

Unstable running (roll monitoring)

Generation of service signals such as for door opening

Signaling
Typical locations of speed measurement:

Traction motor

Gear box

Wheel axis
General Information
The Baumer MTR series is designated for speed measurement in harsh environment, in particular for railway applications. It offers compliance with all relevant standards such as the EN 50155, EN 61373, EN 45455 and exceeds these requirements in many aspects to meet the
expectations in real life. The measurement principle is based on measuring the changes in the magnetic field when a gear wheel rotates in
front of the sensor.
The sensors are available in many variants:





Electronics: sensors with different number of signals, insulated systems and outputs are available
Housing: railway typical housing with 42mm flange in straight and L-shaped (angled) versions
Connection: customer specific connections at the cable end
Screening: there are variants where the cable screen is either connect to the sensor housing or not
Gear wheel: the sensors can be adjusted to operate with different wheels, in particular with different modules
EN/2015.11.30
On the following pages it is described how the different variants can be generated:
First the sensor electronics needs to be chosen, followed by the sensor housing, the connection, the target gear wheel, cable termination and
cable length.
Design and specifications subject to change without notice
The robust stainless steel housing together with a rugged 13mm thick silicone cable provides a high mechanical stability for demanding applications. In particular, its high pull out force reduces the risk of damage during installation. The innovative screening concept (patent pending)
transfers the cable screen to the inside of the sensor and guarantees that the sensor electronics is always protect from electromagnetic disturbances which are present for example in the vicinity of traction motors. In addition, the internal screen provides a high insulation resistance
between electronics and sensor housing. This reduces the risk of sensor damage, if there high differences in electric potential between sensor housing and electronics. The sensors were qualified in very demanding environmental and EMC tests. The associated test reports are
available upon request. Speed generation down to 0 Hz allows for accurate measurements of slow speed.
www.baumer.com
Product Data Sheet, MTR_01
1 / 10
Compression ring kit
Railway
ZPX1-006
Speed Sensors
MTR
For LBFS
series:
sliding
Speed
connection
sensors for railway applications
Technical data (general)
Environmental specification
Electrical interface
(general)
Vibration resistance
(functional)
Switching frequency range
0 ... 20 kHz
Voltage supply +Vs
(permanent)
9 ... 30 VDC
extended versions available upon
request
Vibration resistance
(long time)
Nominal voltage Un
(according EN 50155)
15 ... 21.4 VDC
Shock resistance
Current consumption max.
(no load)
EN 60068-2-64 Fh
10 minutes, 38m/s2, 5-250 Hz
EN 61373: category 3
EN 60068-2-64 Fh
5h per axis, 144m/s2, 5-250 Hz
EN 61373: category 3
EN 60068-2-27 Ea
EN 61373: category 3
6 bumps per axis, 1000m/s2, 6 ms
30 mA
Constant temperature
(operational cold)
IEC 60068-2-1 Ad
Voltage outputs
push-pull (for each output)
Constant temperature
(operational dry heat)
IEC 60068-2-2 Bd
Maximal output current
< 20 mA (for each output)
exceeds EN 50155 (12.2.4)
Short circuit protection
(output to GND)
yes
Constant temperature
(damp heat)
IEC 60068-2-78
Reverse polarity protection
(+Vs to GND)
yes
Constant temperature
(storage cold)
IEC 60068-2-1 Ab
Insulation strength
(electronics to housing)
2.5 kVrms
Duty cycle
Constant temperature
(storage dry heat)
90° +/- 45°
(minimal phase shift φ>45°)
more accurate versions available
upon request
50% +/- 10%
more accurate versions available
upon request
72h, -40°C
IEC 60068-2-1 Bb
1000h, 125°C
Temperature variation
(constant humidity)
IEC 60068-2-14 Nb
Temperature variation
(varying humidity)
IEC 60068-2-30 Db
20 cycles (exposure 3h), -40°C … 120°C, 1°C/min
exceeds EN 50155 (12.2.5)
6 cycles (exposure 24h), 25°C … 60°C, 1°C/min,
90-100% humidity
Constant humidity
30 days, 85°C, 95% humidity
Fast temperature changes
IEC 60068-2-14 Na
35 cycles, -20°C … 100°C, changing time <5 min
As a standard the cable shield is not
connected to the sensor housing.
Other variants available upon request.
Mechanical data
Housing material
stainless steel 1.4404
Cable (standard)
silicone cable Ø13mm (black)
AWG 20
fire protection: HL2 (EN 45545-2)
O-ring
HNBR 70 Shore A Ø22 x 2,5
Gear wheel requirements
Tooth size
21 days, 40°C, 93% humidity
exceeds EN 50155 (12.2.13)
Shielding
Connection of cable shield
6h, 125°C
exceeds EN 50155 (12.2.3 and 14)
Signal quality
Phase shift
(only applicable to sensors
with quadrature output)
-2h, 40°C
modules 1 to 3 (others on request)
Fast temperature changes
followed by immersion
IEC 60068-2-14 Na
Salt resistance
96h in salty atmosphere, 35°C
10 cycles, 5°C … 85°C, changing time <10 s
at the end: immersion in water 24h, 1.5m
EN 50155 (12.2.10)
Electromagnetic
compatiblity
Electrostatic discharge
EN 61000-4-2
EN 50121-3-2 (9.3): criterion B
±6 kV (contact discharge)
±8 kV (air discharge)
Radio frequency immunity
(radiated)
EN 61000-4-3
EN 50121-3-2 (9.2): criterion A
80 Hz … 1000 MHz: 20 V/m, 80% AM, 1kHz
1400 MHz … 2100 MHz: 10 V/m, 80% AM, 1kHz
2100 MHz … 2500 MHz: 5 V/m, 80% AM, 1kHz
Electrical fast transient/burst
EN 61000-4-4
EN 50121-3-2 (7.2): criterion A
level 4: ±2 kV, 5 kHz
Electrical fast transient/burst
EN 61000-4-4
(direct on signal lines) criterion A
level 3: ±1 kV, 5 kHz
Width
≥ 10 mm (smaller wheels on request)
Material
ferrous (μr>>1)
Surge immunity
EN 61000-4-5
EN 50121-3-2 (7.3): criterion B
±2kV, 1.2/50 μs
Shape
involute gear (DIN 867)
Conducted radio frequency
EN 61000-4-6
EN 50121-3-2 (7.1): criterion A
0.15 … 80 MHz, 10 Vrms, 80% AM, 1kHz
Radio frequency emission
(conducted)
EN 55011
Ambient conditions
Operating temperature
-40 … 120°C
Storage temperature
-40 … 120°C
Protection class
IP67 / IP68 (24h, 1m under water) /
IP69K
exceeds EN 50155 (12.2.12)
www.baumer.com
EN 50121-3-2 (4.1)
Radio frequency emission
(radiated)
EN 50121-3-2 (6.1)
Product Data Sheet, MTR_01
9 KHz … 150 KHz: no limits
150 KHz … 500 KHz: 99 dBμV/m, quasi-peak
500 KHz … 30 MHz: 93 dBμV/m, quasi-peak
EN 55011
30 MHz … 230 KHz: 40 dBμV/m, quasi-peak
230 MHz … 1 GHz: 47 dBμV/m, quasi-peak
2 / 10
Compression ring kit
Railway
ZPX1-006
Speed Sensors
MTR
For LBFS
series:
sliding
Speed
connection
sensors for railway applications
Overview of variants
The sensor design is based on a platform which allows the generation of variants. Within the platform , 8 modules can be selected and are
listed on the following pages:
1)
Electronics
2)
Mechanical interface
3)
Cable outlet
4)
Cable and screening
5)
Target (gear wheel)
6)
Direction definition
7)
Cable end termination
8)
Cable length
Baumer is experience in the design of customised variants. If you do not find a the right variant in this document, please contact Baumer.
1) Electronics variants with 1 supply voltage
Electronics variant
Type code Schematics
Single channel with voltage
output
U1P
Dual channel with voltage output
(quadrature signals)
UQP
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Product Data Sheet, MTR_01
3 / 10
Compression ring kit
Railway
ZPX1-006
Speed Sensors
MTR
For LBFS
series:
sliding
Speed
connection
sensors for railway applications
1) (continued) Electronics variants with 2 independent supply voltages
Electronics variant
Type code
Sensor with 2 galvanically separated systems:
UCP
Schematics
System 1: dual channel with
voltage output (quadrature signals)
System 2: galvanically separated
copy of signal A from system 1
(voltage output)
Sensor with 2 galvanically separated systems:
UEP
System 1: dual channel with
voltage output (quadrature signals)
System 2: galvanically separated
copies of signal A and B from
system 1 (voltage output)
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Product Data Sheet, MTR_01
4 / 10
Compression ring kit
Railway
ZPX1-006
Speed Sensors
MTR
For LBFS
series:
sliding
Speed
connection
sensors for railway applications
2) Mechanical variants (interface on gear wheel side)
Mechanical variant
Type code
Flange housing
FSP

42 mm bore distance

29mm head length

With mounting pin
Flange housing:

42 mm bore distance

29mm head length

Without mounting pin
Other interfaces
www.baumer.com
Drawings
FSN
Available on request
Product Data Sheet, MTR_01
5 / 10
Compression ring kit
Railway
ZPX1-006
Speed Sensors
MTR
For LBFS
series:
sliding
Speed
connection
sensors for railway applications
3) Cable outlet variants
Cable outlet variant
Type code
Straight cable outlet
S
L-shape (angled) cable outlet
A
Drawings
B
C
D
E
F
G
cable
H
Other cable outlets
www.baumer.com
Available on request
Product Data Sheet, MTR_01
6 / 10
Compression ring kit
Railway
ZPX1-006
Speed Sensors
MTR
For LBFS
series:
sliding
Speed
connection
sensors for railway applications
4) Cable and screening
Cable variant
Type code
Details
Screen not on housing
(standard variant)
SZN

Cable: 13mm silicone

Protective tube: none

Screening: cable screening not connected to sensor housing

Cable: 13mm silicone

Protective tube: none

Screening: cable screening connected to sensor housing
Screen on housing:
SZS
Other cables and protective
tubes
Available on request
5) Target (gear wheel)
Gear wheel
Type code
Details
Module 1.0 (involute gear)
10
Air gap range: 0.1 … 0.8 mm
Module 1.5 (involute gear)
15
Air gap range: 0.1 … 1.2 mm
Module 2.0 (involute gear)
20
Air gap range: 0.1 … 1.5 mm
Module 2.5 (involute gear)
25
Air gap range: 0.1 … 1.6 mm
Module 3.0 (involute gear)
30
Air gap range: 0.1 … 1.6 mm
Other gear wheel geometries
Available on request
6) Direction definition
Direction of rotation
Type code
A leads B if wheel rotates from
pin/pin hole towards center of
sensor
S
A leads B if wheel rotates from
center of sensor towards pin/pin
hole
T
Drawings
Not applicable as single channel Z
sensor
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Product Data Sheet, MTR_01
7 / 10
Compression ring kit
Railway
ZPX1-006
Speed Sensors
MTR
For LBFS
series:
sliding
Speed
connection
sensors for railway applications
7) Cable termination
Cable termination
Type code
Tinned litz wires
(standard variant)
C
Details
Connection and wire assignment see 1) electronics
Connector or other termination
Available on request
8) Cable length
Cable length in cm
Type code
Details
1m
0100
Measured from flange (straight housing) or center line (angled housing) to end of sheath
2m
0200
Measured from flange (straight housing) or center line (angled housing) to end of sheath
5m
0500
Measured from flange (straight housing) or center line (angled housing) to end of sheath
Other lengths
www.baumer.com
up to 10m possible, indicate in cm, e.g. 0250 = 2.5m
Product Data Sheet, MTR_01
8 / 10
Compression ring kit
Railway
ZPX1-006
Speed Sensors
MTR
For LBFS
series:
sliding
Speed
connection
sensors for railway applications
Installation information (general)
Setup sensor to gear wheel Details
Working distance
The allowable air gap range is dependent on the gear wheel and is listed in the section 5) target. The closer
the sensor is mounted to the gear wheel the more stable the signals will be. During operation, the gear wheel
must not touch the front face of the sensor, as this might damage the sensor.
Alignment of sensor to wheel
In order to get optimal signals, the sensor should be centered with respect to the toothed gear. This means
that side offset should be kept minimal.
Mechanical interface
Details
Clamping of cable
Worst case conditions:

Sensor is mounted horizontally

Cable is not bent until first clamp

Vibrations class: EN 61373 category 3 (wheel axis)
In worst case conditions, the first clamping point of the cable must be at maximal L=500mm. Please consult
Baumer if longer free cable length is required.
Pull out force
The sensor variant with the silicone cable has a high pull out force 200 N.
Installation aid
Alignment pin (standard)
Connection of wires
The color designation of the wires is listed in section 1) electronics.
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Product Data Sheet, MTR_01
9 / 10
Compression ring kit
Railway
ZPX1-006
Speed Sensors
MTR
For LBFS
series:
sliding
Speed
connection
sensors for railway applications
Ordering code
The ordering code for the railway speed sensor is composed as follows:
Sensor series
Railway speed sensor
.
-
.
.
/
MTR
1) Electronics
Single channel with voltage output
Dual channel with voltage output (quadrature signals)
Sensor with 2 galvanically separated systems (1 copy)
Sensor with 2 galvanically separated systems (2 copies)
2) Mechanical variants
Flange housing with pin (bore distance 42mm, head length 29mm)
Flange housing without pin (bore distance 42mm, head length 29mm)
3) Cable outlet variants
Straight cable outlet
L-shaped (angled) cable outlet (0°)
Angled cable outlet (45°)
Angled cable outlet (90°)
Angled cable outlet (135°)
Angled cable outlet (180°)
Angled cable outlet (225°)
Angled cable outlet (270°)
Angled cable outlet (315°)
U1P
UQP
UCP
UEP
FSP
FSN
S
A
B
C
D
E
F
G
H
4) Cable and screening
Screen not connected to housing (silicone cable, no protective tube)
Screen connected to housing (silicone cable, no protective tube)
SZN
SZS
5) Target wheel
Module 1.0
Module 1.5
Module 2.0
Module 2.5
Module 3.0
10
15
20
25
30
6) Direction definition
A leads B if wheel rotates from pin/pin hole towards center of sensor
A leads B if wheel rotates from center of sensor towards pin/pin hole
Not applicable as single channel sensor
7) Cable termination
Tinned litz wires
S
T
Z
C
8) Cable length (in cm)
1.5 meter cable length
2 meter cable length
5 meter cable length
0150
0200
0500
Customer specific variants with options not shown in this document are available, please contact Baumer for further details.
Example: MTR.UQP-FSPS.SZN.20TC/0500
 Railway speed sensor
 Dual channel with voltage output (quadrature signals)
 Flange housing with pin (bore distance 42mm, head ength 29mm)
 Straight cable outlet
 Screen not connected to housing (silicone cable, no protective tube)
 Module 2.0
 A leads B if wheel rotates from center of sensor towards pin/pin hole
 Tinned litz wires
 5 meter cable length
www.baumer.com
Product Data Sheet, MTR_01
10 / 10
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