Carbolite MTT 12/38/850 - Manual (Page 6)

MTT
6
MF38 – 3.07
3.3 General Operating Advice
Heating element life is shortened by use at temperatures close to maximum. Do not leave the
furnace at high temperature when not required. The maximum temperature is shown on the
furnace rating label and on the back page of this manual.
Switch off the Heater switch whenever loading or unloading anything into the ceramic worktube -
see the safety warning below.
Lightweight ceramic fibre insulation can easily be marked by accidental contact. Some fine cracks
may be visible on the surface of the insulation, or in the surface of the chamber due to the
progressive shrinkage of the insulation materials. Cracks are not usually detrimental to the
functioning or the safety of the furnace.
Avoid metal directly touching the work tube - see the safety warning below.
3.4 Operator Safety
The ceramic materials used in furnace manufacture become electrically conductive to some extent
at elevated temperatures. DO NOT use any conductive tools within the work tube or chamber
without isolating the elements.
The elements are isolated when the Heater switch is OFF. This switch directly cuts both sides of
the heating circuits.