Spectrodyne's pyrometer operates on the disappearing filament principle.

DFP 2000 offers accurate temperature measurement. Suitable for applications requiring stringent temperature measurements, the device from Spectrodyne Inc. provides user-controlled precision targeting, high 1° resolution and a short, 0.65 Km wavelength. Encased in rugged cast aluminum housing, the device operates on the disappearing filament principle, blending the brightness of a hot target with that of a calibrated lamp filament.

November 2000, RS# 231