With over 550 employees worldwide, Prüftechnik are world leaders in Condition Based Monitoring, Non-Destructive Testing and Laser Alignment solutions across a wide range of industrial applications.

With products, processes and services for condition monitoring and availability optimization, Prüftechnik helps to ensure that your machines run smoothly and generate an output of consistently high quality. This also includes systems for automatic process control and quality assurance that are integrated directly in your production process.



High frequency technology for outstanding heating performance.

Proper shrink fitting extends the life of roller bearings by several times. EDDYTHERM Portable operates in the high-frequency range to heat roller bearings with an inner diameter as small as 20 mm up to an outer diameter of 160 mm and a weight of up to 10 kg.

The workpiece is placed onto the cone shaped heating surface. The integrated time and temperature regulation capability ensures that the workpiece is heated evenly with no risk of overheating.

Key features

  • Suitable for bearings up to 10 kg

  • Portable and compact induction heater

  • Magnetic temperature probe up to 180°C

  • No support yoke required

  • Predictive temperature control (no overheating)

  • Available options: Voltage from 100 - 230 V and frequency 50/60 Hz.

  • High frequency technology for outstanding heating performance

EDDYTHERM® is the logical approach to shrink fitting of bearings, gears, couplings, impellers, crane wheels, rings, sleeves, etc

EDDYTHERM® utilizes the induction principle as in transformers – its core and windings can be seen as the primary side, but the workpiece acts as a short-circuited secondary winding, which rapidly heats up due to its great electrical resistance.  This phenomenon allows EDDYTHERM® to control heating by continuously monitoring the workpiece temperature and adjusting its own heating power accordingly.  This ensures that the workpiece is heated evenly and the selected temperature is achieved precisely. The crossbar itself remains cool to touch.

Why shrink fitting?

Proper shrink fitting extends the life of roller bearings by several times. Nearly half of all reduced bearing life expectancy is due to improper installation. Mechanical methods such as hammers and hydraulic presses risk damaging the inside surface of the inner ring and the bearing races.  The better shrink fitting solution is via induction heating.

Detailed features

  • Robust industrial design

    • Equipment for workshop use

    • Heavy-duty construction

    • Suitable to use with work gloves

  • Environmentally friendly
    • Energy saving
    • No smoke or oil vapour
  • Safety
    • Automatic error detection
    • Thermal overload protection
  • Saves bearings
    • No contamination of factory prelubrication
    • Precision ground crossbars reduce vibration, preventing chatter marks on bearings
  • Demagnetization
    • All EDDYT​HERM® heaters demagnetize workpieces automatically at the end of every heating cycle with no residual magnetism to collect debris.
  • Magnetic temperature probe up to 180°C
  • Easy operation:
    • Temperature and time selection

    • Temperature display in °C or °F

    • Digital display of set and actual value

    • Acoustic signal at the end of heating cycle

    • Dust, oil and water-resistant operator panel

    • Straightforward operation

    • Automatic demagnetizing

  • Thermal overload protection

Summary of Features

  • Robust industrial design

  • Easy operation

  • Environmentally friendly

  • Safety

  • Saves bearings

  • Automatically demagnetizes

  • Suitable for bearings up to 0 kg

  • Compact and flexible with movable stand

  • Magnetic temperature probe up to 180°C

  • Available options: Voltage from 100 - 230 V and frequency 50/60 Hz.​

  • Magnetic temperature probe up to 180°C 

  • Thermal overload protection​

Technical specifications

Voltage 100V- 230V1) / 50 - 60Hz
Power consumption max. 1.5 kVA
Workpiece max. weight 10 kg
Workpiece bore diameter inside > 20 mm/outside < 160 mm
Thermal overload protection yes
Temperature control up to 180°C
Temperature accuracy better than 3°C
Time setting 0-10 min
Residual magnetism after heating < 2 A/cm
Power throttling yes
Error display yes
Dimensions (W x D x H) 420 x 280 x 345 mm
Distance between posts -
Weight (Standard version) 3.5 kg 

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