BASIC DIFFERENCE BETWEEN AMETEK 931S, 932S AND 933

	Model 931S Single-Gas UV Analyzer	Model 932S Multi-Gas UV Analyzer	Model 933 UV Analyzer
Method	Dual wavelength, high resolution, non-dispersive UV analysis.	Multi-wavelength, high resolution, non-dispersive UV analysis.	Non-dispersive UV analysis for measurement of H2S, carbonyl sulfide (COS), and methyl mercaptan (MeSH) in pipeline quality natural gas.   Frontal elution chromatography is used to remove interfering species from the sample gas.
Range Measuring Cell	H2S:  Range @ 228 nm -  30 % H2S / (Cell length), minimum 200 PPM to maximum 100 % H2S:  Range @ 214 nm - 30 % H2S / (Cell length), minimum 50 PPM and maximum 75 %. SO2 :  Range -  15 % SO2 / (Cell length),  minimum of 100 PPM	SO2 : Range -  20 % SO2 / (Cell length),  minimum  100 PPM NO: Range -6 % NO / (Cell length), minimum 60 PPM. NO2: Range - 30 % NO2 / (Cell length), minimum 150 PPM. COS: Range - 50 % COS / (Cell length), minimum 400 PPM. H2S: Range -@ 228 nm = 20 % H2S / (Cell length), minimum 200 PPM.  H2S: Range- @ 214 nm = 4 % H2S / (Cell length), minimum 60 PPM. NH3: Range - 10 % NH3 / (Cell length), to a minimum of 200 PPM.	STANDARD RANGE MEASURING CELLS  H2S Standard Range: 4,000 / (Cell length) Minimum ranges are 1/4 of maximum ranges. COS Standard Range: 20,000 / (Cell length) Minimum ranges are 1/5 of maximum ranges. MeSH Standard Range: 10,000 / (Cell length) Minimum ranges are 1/5 of maximum ranges. LOW RANGE MEASURING   H2S: 0–5 PPM minimum and 0–50 PPM maximum. COS: 0–25 PPM minimum and 0–250 PPM maximum. MeSH: 0–15 PPM minimum and 0–100 PPM maximum.
Column	No	No	Yes
Sample Gas Temperature	165 °C	165 °C	0 °C to 50 °C with Column Block  0 °C to 165 °C  without Column Block
Laptop Communicating software	931&932 configurator	931&932 con figurator	933 configurator
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