These models are heated by wire heating elements protected from chemical and mechanical damage by a high quality, hard wearing alumina based liner. The graded winding and heating from four sides allow the elements to compensate for heat loss and they are additionally used to preheat the air entering the furnace. Temperature uniformity within the chamber is therefore excellent, despite the higher airflow through the chamber.
The AAF 11/3 and AAF 11/7 have a large floor area which allows many samples to be accommodated and because of the low chamber height the airflow is held close over the samples to promote burning. High airflow of between 4-5 changes per minute is ensured by use of an air inlet and a tall chimney, however it is not too high to disturb the samples in the crucibles, or chill them, as the incoming air is preheated.
The AAF range is ideal for ashing materials such as food, plastics, coal and other hydrocarbons. The AAF 11/7 furnace complies with the following industry standards BS 1016 part 4, ISO 344 and 1171, ASTM D2361, D2795 and D3174.
The AAF 11/18 has high grade heating wire mounted behind silicon carbide tiles to protect against carbon or corrosive atmospheres. A two tier shelf is supplied as standard, which doubles the furnace capacity.
The AAF 11/8 has high grade heating wire mounted behind silicon carbide tiles to protect against carbon or corrosive atmospheres. A two tier shelf is supplied as standard, which doubles the furnace capacity
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 Maximum operating temperature 1100 DegC
Chamber capacities of 3, 7 or 18 litres
Robust mullite muffle design
of 3 & 7 litre models and silicon carbide tiles of 18 litre model
offer strong resistance to carbon build up and chemical attack
Constant airflow of 4-5 volume changes per minute ensures rapid combustion
Pre-heated airflow to maintain excellent temperature uniformity
3 & 7 litre models supplied with inconel tray & handle for easy loading/unloading
Tall chimney for fume exhaust by convection
Vertical counter-balanced door keeps hot door insulation away from operator
Postive break door safety switch isolates chamber from power supply, when the door is opened
Double skinned construction allows convection air flow to cool the outer case, to conform to EN61010 safety standard
Choice of PID controller or programmers
Pictured above are 3 & 7 litre models Models in this range:
AAF 11/3
AAF 11/7
AAF 11/8
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Furnaces & Ovens
