Eddy current sensors for displacement,
distance and position
Eddy current and inductive
measurement system and sensors with
micrometer resolution for linear
measurement and displacement,
distance and position
Non-contact eddy current sensors or inductive measurement
systems also kown as oszillation sensors, flatness sensor, position
sensor, dislocation sensor, displacement sensor, distance sensor,
small miniature sensors for measurement in motors, heavy industry,
heat resistant, stable, robust, industry sensor, measurement system
for motor optimisation, top dead centre of the piston, dislocation
Needle Lift, fuel injection, spindle movement, thermal drift, axial
movement of crankshaft, speed sensor for turbo chargers, gap,
measurement system for elongation, also for customer-specific OEM
sensors, automotive engineering test and test-rigs, automotive
sensors
eddyNCDT 3010
Non-Contact Displacement Measuring Systems
The eddyNCDT 3010 (Non-Contacting Displacement
Transducers) is a non-contacting displacement measuring
system operating on the eddy current principle. It is used for
measuring targets made of electrically conductive materials
which may be either ferromagnetic or non-ferromagnetic.
A high-frequency alternating current flows through a coil cast
in the sensor housing. The electromagnetic coil field induces
eddy currents in the conductive target which alters the AC
resistance of the coil. This change in impedance produces a
linear electrical signal proportional to the distance of the
target from the sensor. Temperature-dependent measuring
errors are reduced to a minimum by a unique electronic
compensation method.
1
2
3
4
5
6
TYPICAL APPLICATIONS
1 - vibration, amplitude, clearance, run-out
2 - displacement, distance, position, elongation
3 - deflection, deformation, waviness, tilt
4 - dimensions, measuring tolerances, sorting,
part recognition
5 - stroke, deformation, axial shaft oscillation
6 - bearing oscillations, lubricating gap,
wear, displacement
The
eddyNCDT 3010 is designed for industrial use in
production plants, for machine control and for measuring
and testing during in-process quality assurance. Illustrated
are examples showing only a small selection of the numerous
possibilities.
ADVANTAGES
• Wear and maintenance free
• Excellent linearity <0.25 % FSO
• Active temperature compensation (<150 ppm/F)
• Flexible field calibration
• Multi-channel applications by synchronization
Temperature Compensation
The temperature operating range of the 3010 sensors ranges
from -50 °C up to 150 °C. In the case of fluctuating ambient
temperatures a stable output signal is very important for
reliable measurements. Due to a patented temperature
compensation method the eddyNCDT series 3010 offers a
unique thermal stability, which no other system can offer.
Temperature error by comparison
Temperature error (% FSO)
10
8
6
4
2
0
10
20
30
40
50
65
°C
10
8
6
4
2
0
10
20
30
40
50
65
°C
Temperature error (% FSO)
10
8
6
4
2
0
10
20
30
40
50
65
°C
Temperature error (% FSO)
common inductive sensor
with ferrite core
02
common eddy current sensor
without temperature compensation
best practice:
eddy
NCDT
3010
with temperature compensation
System structure
The eddyNCDT 3010 is a compact, single-channel system
consisting of an eddy current sensor, a sensor connecting
cable and an amplifier electronics (signal conditioning unit).
In multi-channel set-ups, synchronization of separate
channels is possible. The system is matched to a reference
target material (aluminum or steel AISI 4130) and is
adjustable for ferro- or non-ferromagnetic material.
Series eddyNCDT 3010 is a non-contact displacement
measuring system using the eddy current principle:
1) power and output cable (accessory)
2) amplifier electronics
3) sensor cable
4) sensor
1
2
3
4
Synchronization
If several channels of series 3010 operate simultaneous
close to one another, a mutual interference is possible
because of slight differences in the oscillator frequencies.
This can be avoided by synchronization. Two SMC-
connectors at the electronic box, one for oscillator signal
output (sync out) and one for input (sync in) are standard
equipment. The electronics operate independently as long
as they are not interconnected. lf connected together, they
automatically switch to synchronized operation and are
controlled by the first electronics (master). Any quantity of
units can be synchronized by serial connection.
03
SC30 – synchronization cable (accessory)
amplifier
electronics
in
sync
out
amplifier
electronics
in
sync
out
amplifier
electronics
in
sync
out
eddyNCDT 3010
Technical specifications
Technical specifications are valid for the aluminum or mild
steel AISI 4130 reference materials at 20 °C (70 °F). The data
may deviate for other materials.
Linearization and Calibration
eddyNCDT 3010 systems can be individually linearized and
calibr
ated by simple 3-point adjustment. Therefore optimum
3-point calibration
1/1
3
accuracy can always be achieved even with special target
materials or critical sensor mounting conditions.
The adjustment is carried out at 3 distances (1, 2, 3) which
are measured by an independent reference.
Accessory: Micrometer calibration device
Sensor
Output
1/2
2
1
1/2
Range (Displacement)
1/1
To gain best performance the eddyNCDT 3010 supports a
field calibration. This is neccessary to get best measuring
results in respect to
- A: different target materials
- B: target size (measuring spot)
- C: target shape
- D: side load
- E: target tilt
Also with the field calibration the measuring range can be
extended.
common sensor without field calibration
Signal
A
C
B
E
D
best practice:
eddy
NCDT
3010 with MICRO-EPSILON field calibration
Signal
AC
B
D
E
±0.25 % FSO
Range
Offset
Why is field calibration needed?
Target
Range
04
Technical data
Sensor model
DT3010-A
DT3010-M
Measuring range *
mm
inch
Offset distance
Linearity
Static repeatability
Resolution
1
Frequency response
Temperature range
sensors and cables
Temperature stability
sensors (£ midrange)
£
Temperature compensation range
Temperature range electronics
µm
µm
mm
inch
U05
U1
S1
S2
U3
U6
U15
Non-ferromagnetic target (reference target: alu)
Ferromagnetic target (reference target: ST37)
0.5
0.02
0.05
0.002
1
0.04
0.1
0.004
1
0.04
0.1
0.004
2
0.08
0.2
0.008
3
0.12
0.3
0.012
6
0.25
0.6
0.025
15
0.60
1.5
0.060
£
£±0.25%
FSO
0.05
0.025
0.1
0.05
0.1
0.05
0.2
0.1
0.005 % FSO
25 kHz (-3dB)
0.3
0.15
0.6
0.3
1.5
0.75
Operation: -50 to 150 °C / -60 to 300 °F
Storage: -50 to 150 °C / -60 to 300 °F
£0.025%
FSO / °C •
£
£0.015%
FSO / °F
£
10 to 65 °C / 50 to 150 °F
Operation: 10 to 50 °C / 50 to 125 °F
Storage: -25 to 75 °C / -15 to 170 °F
Temperature stability
£
electronics (£ midrange)
Signal output
Power supply
Electromagnetic compatibility (EMC)
Synchronization
Protection class
FSO = Full Scale Output
1) static resolution at midrange
£0.05%
FSO / °C •
£0.03%
FSO / °F
£
£
0 ... 10 V / 10 mA and 4 ... 20 mA
24 VDC (9 ... 30 V) / 205 mA
acc. EN 50081-2 • EN 50082-2
with cable SC 30 (accessory)
Electronics IP 54 Sensors IP 65
Sensor model *
Shielded sensors
Unshielded sensors
Sensor weight (appr.) without cable
Standard sensor cable length
Optional sensor cable length
* customized sensors / ranges available
g
ounce
m
ft
m
ft
U05
•
0.6
0.02
3
10
6
20
U1
•
1.5
0.05
3
10
6
20
S1
•
5
0.2
3
10
6
20
S2
•
U3
•
U6
•
22
0.8
3
10
6
20
U15
•
24
0.85
3
10
6
20
9
0.3
3
10
6
20
7.5
0.25
3
10
6
20
05
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