Introduction; Application; Operating Conditions; Principle Of Operation - BEGA BETEX BLF 200 Manuel Utilisateur

2. Introduction

2.1 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 bushes, 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 BLF200 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), we
recommend that you do not do so for more than half an hour. Use an external thermometer.
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.

2.2 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.

2.3 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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