How do inductive probes work

Inductive position measuring systems

Driver name
ECL202ECL150ECL101 / ECL110ECW110ECA101ECA110
Max. Bandwidth15 kHz15 kHz80 kHz1kHz10kHz10kHz
Measurement range0.25mm - 15mm0.50mm - 15mm0.50mm - 15mm2mm - 3.5mm0.50mm - 15mm0.50mm - 15mm
Typical linearity0,2% 0,2% 0.5% F.S.0.5% F.S.Non-linearNon-linear
Resolution at 15kHzNon-ferrous 0.007%, ferrous 0.009%Non-ferrous 0.007%, ferrous 0.009% Non-ferrous 0.009%, ferrous 0.011%100nm @ 1kHzNon-ferrous 0.02%, ferrous 0.02%Non-ferrous 0.02%, Ferrous 0.02% @ 10kHz
Zero / offset adjustYesYesYesNoYesNo
Typical thermal drift0.01% F.S. * / C0.01% F.S. * / C0.04% F.S. * / C0.04% F.S. * / C0.04% F.S. * / C0.04% F.S. * / C
LED range indicatorYesYesYesNoYesNo
Other featuresBandwidth: 100 Hz, 1 kHz, 10 kHz, 15 kHz (user selectable)Bandwidth: 250 Hz, 1 kHz, 10 kHz, 15 kHz (user selectable)Two environmental ranges - Standard to 125C, High to 200C Two environmental ranges - Standard to 125C, High to 200C Embeddable unit, no user adjustment
* F.S. = full scale

The eddy current sensor system ECL202 offers exceptional resolutions of up to 10 nm and bandwidths of up to 15 kHz. The electronics of the ECL202 are based on the latest digital FPGA technology, offer excellent interference immunity and very high stability. The system offers a linear analog voltage output (0-10 volts) proportional to changes in the target position and a digital (switched) output with a user-programmable switching threshold.

Sample modelRange TypeRange mmNear gap mmMaterial type

Resolution nm @ 100Hz

@ 1 kHz@ 10 kHz@ 15 kHzECL202e @ 15kHzThermal drift probe% F.S. / CThermal drift driver 
U3Fine0,250,05Non-ferrous10152530 -0,040,04 

Oxide thickness of the reactor plate - The customer had to measure the thickness of the oxide layer on the surface of nuclear fuel rods. This thickness is used to determine the remaining life of the rods and to optimize the economic performance of the nuclear fuel rod. Since defects in the oxide layer are also detected, it is used to analyze the causes of defective fuel rods and to validate fuel behavior models.

The eddy current sensor system ECL150 system offers up to 8 channels for high resolution position and motion measurements in a small package. It is ideal for multi-sensor applications in the industrial environment, e.g. for synchronized measurement of x, y and z positioning, shaft measurement with 5 degrees of freedom or multi-point thickness measurement.
Sample modelRange mmNear gap mmMaterial type

Resolution nm @ 250Hz

@ 1 kHz@ 10 kHz@ 15 kHzECL150e @ 15kHzThermal drift probe% F.S. / CThermal drift driver 

Machine tool measuring frames - 24 sensors were integrated into a machine tool bed to enable real-time measurements of thermal and workpiece-related deformations. Wireless sensors were used to simplify integration and provide an inexpensive intelligent measurement solution.

When precision measurement is required for high-speed applications, the ECL101 offers extremely high bandwidths of up to 80 kHz. Typical examples of high-speed applications are e.g. the determination of the error movements and the thermal growth of high-speed spindles as well as the observation of high-speed vibrations or ultrasonic applications. The system can be calibrated on site. For multi-channel applications, the ECL101 is available as an OEM system in the form of small and stacked circuit boards with minimal space requirements for OEM applications. Up to eight channels can be ordered as a single ECL110 system.
Sample modelRange mmNear gap mmMaterial typeResolution nm @ 1 kHz@ 10 kHz@ 80 kHz 

Stealth ships - High-precision sensors were used under water to record vibrations and / or movements of moving surfaces on ships (propellers, rudders ...). The combination of high bandwidth and extreme precision of the ECL101 was perfect for this challenge.

The ECW110 offers wireless high-precision inductive measurement technology for continuous measurements of up to 42 hours on one charge. For applications where cabling is a problem, e.g. B. in robotics, with measuring systems that are attached to a moving table or a moving pallet, or where space is limited and several sensors are essential. The system communicates with a laptop via a dedicated WiFi network at a speed of up to 1 kHz. The system consists of driver electronics and 1 to 3 probes.
Sample modelRange mmMaterial type

Resolution nm @ 1 kHz

U80,35 - 2,35Non-ferrous100 
 0,35 - 2,35Ferrous125 
U120,60 - 4,10Non-ferrous160 
 0,60 - 4,10Ferrous200 


Magnetic Levitation - A contactless and wireless solution was developed to control the short stroke of a magnetically levitating precision table in a vacuum in real time. A set of synchronized probes was used to measure z-height and two out-of-plane rotations. 2 kHz bandwidths were achieved with deterministic data transmission with latency values ​​of 300us; sufficient to control real-time positioning. To ensure reliability, the packet loss rates have been reduced to 1.1e-7.

For demanding applications where a very cost effective solution is required, the ECA101 system can provide the precision you need. This non-linear system offers easy operation with adjustable gain, offset and setpoint switching.

Sample modelRange mmNear gap mm 

Thread detection - While conventional sensors have problems detecting the presence of threads, the ECA101 can distinguish between a threaded hole and a threaded hole. In the case of a hole without a thread, the signal changes compared to a threaded hole. The thread pitch can be recorded as a distance sensor.

The ECA110 is a versatile system ideal for applications with high demands on resolution and repeatability, at a lower price than linear sensors. These integrated circuit board units are fully calibrated at the factory, without user adjustments, and delivered ready for installation.

Sample modelRange mmOffset mm