6.4
Operator Safety
This product incorporates a safety switch which interrupts the heating
element circuit when the furnace is opened. This prevents the operator
touching a live heating element and also prevents the product from
heating up if the furnace is left open. The operation of this switch should
be checked periodically.
Depending on use, the surfaces in the working chamber and the
chamber load may still be very hot after the appliance is switched off.
Touching these surfaces may cause burns. Use suitable personal
protective equipment or wait until the appliance cools down to ambient
temperature.
Before removing a hot object from the product, make sure there is a safe place to put it
down. If necessary use tongs, face masks and heat resistant gloves. Heat resistant
clothing and face protection can guard against the effects of radiated heat when the
furnace is open.
When the product is opened during operation there is considerable radiated heat. Do
not keep any flammable objects near the product, nor objects which could be damaged
by radiated heat.
6.5
Over-Temperature Control (if fitted)
The product may be fitted with a “chamber over-temperature control”, if this has been
ordered. The chamber Over-Temperature control stops further heating if an over-
temperature condition is reached and heating is not resumed until the system is
manually reset. Operating instructions for the over-temperature controller are referred
to in section 6.1 and detailed in the controller instructions.
All cupellation furnaces also have an “element over-temperature control” which serves
to cut power temporarily to the heating elements if the temperature in the immediate
vicinity of the elements is too high. Heating resumes when the temperature drops and
manual resetting is not required. This is controlled by a Eurotherm 2132 Controller (or
similar).
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