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.



EDDYTHERM 4x is a powerful induction heater suitable for workpieces up to 300 kg.

The swivel-arm crossbar design and the pedal-operated crossbar lift allows a one-man operation even when mounting extremely large workpieces, while the heavy, welded-steel carriage provides on-site mobility.  

EDDYTHERM 4x controls the 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 the touch.

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


    • Automatic error detection
    • Thermal overload protection

Saves bearings

    • No contamination of factory prelubrication
    • Precision ground crossbars reduce vibration, preventing chatter marks on bearings


    • All EDDYT​HERM® heaters demagnetize workpieces automatically at the end of every heating cycle with no residual magnetism to collect debris.
  • Suitable for bearings up to 300 kg
  • Compact and flexible with movable stand
  • Magnetic temperature probe up to 240°C
  • Available options: Voltage from 200 - 600 V and frequency 50/60 Hz

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

Magnetic temperature probe up to 250°C (depending on model)
Thermal overload protection

Summary of Features

  • Robust industrial design
  • Easy operation
  • Environmentally friendly
  • Safety
  • Saves bearings
  • Automatically demagnetizes
  • Suitable for bearings up to 300 kg
  • Compact and flexible with movable stand
  • Magnetic temperature probe up to 240°C
  • Available options: Voltage from 200 - 600 V and frequency 50/60 Hz
  • Magnetic temperature probe up to 250°C (depending on model)
  • Thermal overload protection​

Technical specifications​

Voltage1) 200 - 600V1) / 50 - 60Hz
Power consumption max.14 kVA
Workpiece max. weight 300 kg
Workpiece bore diameter inside > 79 mm/outside < 640 mm
Thermal overload protection yes
Temperature control up to 240°C
Temperature accuracy better than 3°C
Time setting 0-60 min
Residual magnetism after heating < 2 A/cm
Power throttling yes
Error display yes
Dimensions (W x D x H) 1120 x 550 x 960 mm
Distance between posts 270 mm
Weight (Standard version) 150-174 kg

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