Hochiki HF-24 UV Flame Detector – Installation Manual
3
UV Detection Basics
Summary
The ultraviolet type flame detector, which uses a UV tube, absorbs feeble ultraviolet
light contained in flames and detects them in the form of a discharge pulse train
with the help of the photoelectric effect and electron avalanche phenomenon. The
detector has a counter circuit, which prevents malfunctions from taking place
because of single shot or momentary UV rays, such as lightening and cosmic
radiation.
Comparison of Spectral Characteristics
Curve #1: Response of UV tube
Curve #2: Sunlight
Curve #3: Sensitivity of the human eye
Curve #4: Tungsten filament lamp
©
1995 Hochiki Europe (UK) Ltd DS0204/ISS1/DEC95
