7.5.2 Resistance furnace
Description
The temperature of the furnace is adjustable up to 1550°C. The combustion tube has an inner
diameter of 27 cm and a hot zone of about 200 mm. The temperature, which is digitally
displayed, can be adjusted with an accuracy right down to 1°C. The platform on the front-side of
the furnace serves to carry samples for the analyses, as well as hot combustion boats, after
been removed from the furnace. Inside the furnace inlet there is a gas supply lance for
supplying oxygen into the furnace.
Temperature adjustment
The resistance furnace HTF-540 employs silicon carbide heating elements. Full electronic
control includes current limitation during cold-start conditions to promote long element life. A
separate sensor is used to monitor ambient temperature and to provide data for automatic
reference point compensation ensuring that the furnace temperature is not affected by
fluctuations of the ambient temperature. The furnace requires approximately 10 to 15 minutes to
reach its operating temperature.
Combustion efficiency
The design of the furnace boat-stop guaranties that the oxygen carrier gas enters the
combustion boat, ensuring efficient combustion. This design eliminates the need of fragile
lances and honeycomb boat stops which tend to block easily with ash. Additionally the boat stop
protects the combustion tube from aggressive combustion products, thus extending the service
life of the tube.
The combustion tube is a simple straight
ceramic tube that is robust and inexpensive
to replace. The life expectancy of the tube
is hundreds of analyses.
(protected by German utility model).
A variety of combustion boats can be used
including the reusable ceramic boats
(L=57mm, W=22mm, H=13mm).
Porcelain or quartz boats are also an
option.
: Preheating furnace
The HTF-540 can be used for preheating of ceramic crucibles for induction furnaces. The
crucibles have the standard size of 25mm (1”) diameter and are used for combustion analysis of
carbon and sulfur in solid materials. The preheating reduces the blank value of the crucibles.
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