|
|
|
| |
|
|
HTF-540
High
Temperature Furnace |
 Carbon/Sulfur
models
CS-530,
CS-800,
CS-2000
Oxygen/Nitrogen
models
ON-900,
ONH-2000
Carbon/Water
model
CW-800
|
|
|
|
| Overview |
|
The temperature of this furnace is adjustable up to
1550°C. The combustion tube has an inner diameter
of 27 mm 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 their hot remainders, once
extracted from the furnace. Inside the furnace inlet
there is gas supply jet, to ensure correct dosage of
the combustion gas. On request, the HTF-540 can be supplied
with a flow meter and adjustable restrictor for the
adjustment of the inlet gas flow. At the furnace outlet
there is dust trap, together with tube connection. A
micro filter, made up of fine precious stone fibre,
is also available. A glass tube is connected at the
furnace outlet, which can be filled with e.g. moisture
absorber or any other absorber. The furnace´s
robust housing, contains a built-in fan; thus ensuring
low surface temperature, in order to prevent contact
injuries.
|
|
|
|
|
|
|
| Temperature adjustment |
The 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 provide data for
automatic reference point compensation ensuring that furnace
temperature is not affected by fluctuations of ambient temperature.
The furnace requires approximately 10 to 15 minutes to reach
operating temperature. |
|
| Combustion
efficiency |
The
design of the furnace boat stop ensures oxygen carrier
gas penetrates into the crucible, ensuring efficient
combustion. This design eliminates the need for fragile
lances and honeycomb boat stops which tend to block
easily with ash. Additionally the boat stop protects
the combustion tube from the aggressive combustion products,
thus extending the 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 measured in thousands of analyses and not hundreds
as is the case with other analysers. ( protected by
German utility model )
|
|
 |
|
|
| Preheating crucibles |
 |
|
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.
This is important for analysis in the very low ppm range.
The crucibles are inserted into the furnace tube and
they remain preheated in the tube until needed. Each
time a crucible is needed, a new one is inserted into
the tube, and a preheated crucible falls out the other
end of the furnace tube. The recommended preheating
temperature is between 1250°C and 1350°C. For
preheating crucibles the boat stop is removed. |
|
|
| Combustion boats |
 |
|
A variety of combustion boats can be used in the HTF-540
including the reusable ceramic boats (L=57mm, W=22mm,
H=13mm). Porcelain or quartz boats are also an option. |
|
| |
Next:
HTF-540 Specifications |
|  |
|
