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2 Safety
2.1
General warnings
CAUTION. Personnel must not be exposed to the microwave energy radiated from the
microwave generator. All connections, waveguides, flanges, gaskets, etc., must be secure in
order to ensure that microwave leakage remains below specified limits. Never operate the
furnace without an absorbing load. To maintain the microwave leakage at an acceptable value,
the microwave heating equipment shall be periodically inspected and kept in good working
condition.
COMPETENT people only should be permitted to install, maintain and operate the furnace.
Installation and maintenance should be done by a qualified electrician. Operating should be
done by a person who has read this manual and is aware of and understands the safety issues
in using high temperature electrically heated equipment.
If this furnace is used in a way not specified by Carbolite, the protection provided by the
furnace may be impaired.
2.2
Operator safety - heat
The temperatures of all external surfaces are within limits set by BS EN 61010. The chimney
will get hot when the furnace is operated at high temperatures – do not touch.
2.3
Door latches and safety interlocks
When the door is closed and latched both the radiant heating and microwave power circuits
are enabled.
When the door is open, both the radiant heating and microwave power circuits are disabled.
When the MW power is on the door is locked.
The operation of these switches should be checked periodically. See section 13.3 for
instructions.
2.4
Safety precautions when opening the door
Take great care when loading or unloading the furnace chamber. [See also section 4.1].
• Do not open the door at high temperatures. If possible, do not open it above 200°C and
keep the door open for as short a period as possible.
• Wear heat-resistant clothing, including appropriate hand and face protection suitable for
high levels of radiated heat, if it is necessary to load or unload work at elevated
temperatures.
• Always wear eye protection if opening the door when the temperature is between 200°C
and ambient. Small fragments of glaze may be ejected from the surface of the elements.
• Objects which are inflammable or could be damaged by radiated heat should not be kept
near the furnace.
• Before removing a hot object from the furnace, make sure you have a safe place to put it
down.
• Read section 4.1 for further notes about opening the door.
MF 55-GB 1.21
MRF 16/22
7
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