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Instrument Database:
Eltra GmbH - HTF-540 High Temperature Furnace
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| Year of introduction |
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| Status |
available |
| Company |
Eltra GmbH
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| Categories |
Sample preparation: Furnaces
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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 using HTF-540
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.
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| Specifications |
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Temperature range
Room temperature to 1550°C adjustable
Resolution
1°C
Display for set point and actual temperature
Digital
Combustion tube inner diameter
27 mm
Length of the hot zone
approx. 20 cm
Power requirements
230 VAC +/-10% 50/60 Hz
Maximum heat up current 20 A
Dimensions
Width 33cm (13”) Height 52cm (20.5”) Depth 60cm (23.5”)
Weight
36 kg
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