This diagram shows that water absorbs long wave infrared very well. Absorption maxima are approx. 3 and 6µm.

This is the spectral absorption of PVC. The main absorption range lies between 7 and 10 µm. The curves for other plastics exhibit a similar character.

Emission spectrum of black body radiators. Dotted Line: 2100°C (as for visible radiators); Solid Line: 1100°C (as for quartz radiators); Dashed Line: 510°C for ceramic radiators, best range 3 to 10 µm.

This graph enables peak wavelength and main wavelength to be determined for each radiator’s power rating.

Temperatures are as indicated by cast in thermocouple. Surface temperatures will be slightly lower.

Temperatures are as indicated by cast in thermocouple. Surface temperatures will be slightly lower.