Choosing the appropriate wavelength range is important for accurate qualitative and quantitative gas analysis by optical method. The 190

2

30 nm band is often used in the research of the SO

2

ultraviolet detection

for the SF

6

gas insulation equipment

the multiple decomposition components have the characteristic absorption in this wave band

hence

it is necessary to explore a new detection band to detect SO

2

accurately. In this paper

an ultraviolet detection platform of SO

2

is set up. The absorption spect

ra of the gas in the band of 190

4

00 nm are measured repeatedly. The absorption spectra of the bands at 290

3

10 nm are analyzed by MPI UV-V is spectra database. The results show that SO

2

has a good concentration inversion performance in the range of 290

3

10 nm

and its linear fitting goodness is 0.996. It is also suitable for on-line detection of trace SO

2

in SF

6

insulated electrical equipment.