Our sight glass assembly was designed for use with high temperature furnace systems. The unique design permits “thermal distortion-free viewing” of a heated cavity.

The window minimizes thermal distortion associated with previous sight ports by providing a curtain of heat at the entrance of the cavity to reduce convective and radiative heat transfer.

The Sight Glass was developed for the patented MELLEN Electro-Dynamic Gradient Crystal Growth System, but now may be applied to other furnaces, as part of our “Intelligent Processing of Materials” project.

By controlling the power level to the auxiliary window heaters, separately from the main furnace heaters, a concentrated curtain of heat is maintained at the entrance to the sight port. Testing has shown that the heat input of the window heaters can minimize the thermal disturbance created by the existence of the sight port.

MELLEN currently offers the sight port design with many MELLEN furnaces. Options for the port include closeable apertures, automatic temperature control of window heaters, special sight glass materials and coatings and water cooled sight glass housings.

For more information, please complete a Request for Additional Information.

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MELLEN can raise your operating temperature in more ways than one, the hotter the better.