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These units have a maximum operating temperature of
1200°C, 1500°C and 1600°C.
For units at 1200°C, heating is via an integral
resistance wire element wound on to the ceramic work tube
which is an integral part of the furnace. At 1500°C
and 1600°C, silicon carbide rod elements are mounted
parallel to the tube.
The end zone controllers are coupled to a centre zone
thermocouple enabling the centre zone temperatures to be
closely linked. This system provides a longer
uniform zone temperature than that achieved by the use of
single zone furnace of the same length.
Temperature uniformity
Temperature variation within the uniform zone is
typically +5°C, with a significant proportion of the
uniform zone length within +1°C. To improve the
uniform zone length within a tube furnace, it is necessary
to use multi-zone furnaces; the usual configuration is 3
zones.
Temperature uniformity will depend on the tube diameter
and heated length.
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