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LECO Tube Furnaces

LECO Cornerstone TF Tube Furnaces deliver high-temperature crucible baking up to 1350 °C, reducing contamination, improving carbon and sulfur accuracy, and cutting energy costs by up to 60%.

The LECO Cornerstone TF Tube Furnaces are versatile, energy-efficient resistance furnaces designed to bake crucibles and significantly reduce contaminants that can interfere with carbon and sulfur analytical results. Engineered for both high- and lower-volume laboratories, the TF series improves data accuracy, repeatability, and operating efficiency while reducing overall energy consumption.<h4>Key Features</h4><ul><li>Long-life molybdenum disilicide heating elements with an operating temperature range from 800 °C to 1350 °C</li><li>Integrated digital furnace controller displaying set point or actual temperature with built-in overtemperature protection</li><li>TF4 Quad Tube Furnace<ul><li>Six heating elements</li><li>Enables simultaneous baking of crucibles in four combustion tubes</li><li>Ideal for demanding, high-volume installations supporting two to four analytical units</li></ul></li><li>TF2 Dual Tube Furnace<ul><li>Four heating elements</li><li>Efficient solution for lower-volume laboratories supporting one to two systems</li></ul></li><li>Increased crucible capacity and optimized furnace design deliver up to 60% lower energy consumption compared to previous models, significantly reducing operating costs</li></ul><h4>Impact of Crucible Preheating on Analytical Results</h4>Preheating crucibles in the TF furnaces has a pronounced effect on carbon and sulfur accuracy. When 528-018 crucibles were baked at 1250 °C for 15 minutes, results for a high-purity iron reference material (certified at 5 ppm carbon and 2 ppm sulfur) showed dramatically improved accuracy and reduced variability.<ul><li>Baked crucibles produced results close to certified values with low standard deviation</li><li>Unbaked crucibles showed elevated carbon and sulfur levels</li><li>Baked but touched crucibles demonstrated significant contamination, highlighting the importance of proper handling after baking</li></ul>These results confirm that controlled crucible baking is essential for achieving low-level carbon and sulfur determinations with confidence.<h4>Energy Efficiency</h4>The redesigned TF furnaces use approximately 60% less energy than previous models. At continuous operation with a full crucible load and a furnace temperature of 1350 °C, operating cost comparisons clearly demonstrate substantial savings in power consumption, making the TF series both an analytical and economic advantage for modern laboratories.<h4>Models</h4><ul><li>TF4 – Quad Tube Furnace</li><li>TF2 – Dual Tube Furnace</li></ul>

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