Radiant flux sensor is a thin foil radiant flux sensor. It is designed to measure the thermal radiation emitted from or absorbed by its sensing area even in the presence of heat transfer through conduction, and convection.

Radiant heaters produce electromagnetic radiation, largely in the infrared, which is identical to light in all but wavelength. This radiation is emitted spontaneously from any heated object, the total quantity increasing rapidly and the average wavelength reducing as it becomes hotter. Radiant heaters are placed in four groups according to wavelength: short wave, medium wave, long wave and low temperature hot water. The first three types have very hot elements and produce intense radiation, which may ignite materials placed too close to them. The shorter the wavelength, the more compact the source and the greater the proportion of radiation to total heat output.

Radiant Superheaters are placed at the rear of the furnace where they receive the bulk of the heat by radiation from the flame. Radiant superheaters located in the boiler furnaces are used on shipboard only in a few installations. A radiant superheater is one in which the tubes are directly exposed to the furnace radiation. Radiant superheaters are widely used in packaged steam generators.

Radiant tube burner is used to transfer heat from combustion gases to the radiant tube and then radiate the energy to the load. This burner is used in specific heating processes where combustion products cannot come in contact with the load or material. It is an indirect heating burner meaning the heat is transferred without any direct flame or combustion exhaust. It is designed to reduce nitrous oxide in the burner process. This type of burner is used for batch annealing, continuous annealing, continuous galvanizing, heat treating, roller hearth and soaking applications.