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3. Introduction
3�1 Application
Betex induction heaters are intended for heating bearings, so they can be assembled easily
by means of a shrink fit. Subject to professional assessment, they can also be used to heat
bushings, cogwheels, couplings and metal objects that form a closed circuit. Bearings and
workpieces are demagnetised automatically after each heating cycle.
Bearings and workpieces can be heated to a maximum temperature of 240ºC (464°F), except
for the Betex BLF 200 type where the maximum temperature is set at 150ºC (300°F).
Betex induction heaters are suitable for continuous use. However, when heating to 240°C
(464°F), don't do so for more than half an hour. Betex BLF 200 has a duty cycle of 1,5 hour.
CAREFUL!
• Bearings may be heated to a maximum of 120°C (248°F).
• Precision bearings may be heated to a maximum of 70°C (158°F). Higher temperatures
can affect metallurgical structure and lubrication, resulting in instability and failure.
• Do not use a heater for bearings and workpieces that are outside the minimum and
maximum dimensions specified in the technical specifications.
• Never switch off the unit with the main switch while it is still heating up.
3�2 Operating conditions
• Only use the device indoors.
• Fit for use in an industrial environment, at an ambient temperature of 0ºC (32°F) to 50ºC
(120°F) and humidity of 5 to 90% – non-condensing.
At temperatures below 0°C (32°F), the unit stops operating.
3�3 Principle of operation
The operation of the heater is based on inducing a (low frequency)
current in the bearing. This is achieved by incorporating the bearing
as a secondary winding in a transformer.
The primary winding is connected to the mains by means of an
electronic controller. The magnetic field induces a high current
(short-circuit current) through the bearing, which then becomes hot.
After each heating cycle, the bearing or workpiece is demagnetised.
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