The Western Research 921M SO2 Analyzer performs simultaneous dual range analysis on a continuous basis. It has a sealed gas reference cell for increased stability and accuracy.The Model 921M is suited for lower range uses (i.e. 0-50ppm and lower). The Model 9000RM can be configured to measure most gas species that absorb in the UV (examples NOx, H2S and SO2). The optional low range white cell provides longer path length for measuring lower concentrations. For example, the minimum full scale for SO2 is 25 ppm, with an accuracy of 1% of full scale. of both methane and non-methane hydrocarbons (NMHCs).
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