... field detecting contents of SO2+SOF2, H2S, CO and HF .... from GIS The gas analyzer for GISis a precision, ... inside the equipment, ie. SO2+SOF2, H2S, CO and HF if SF6 circuit breaker, instrument transformer, GIS and transformer ... . Performance indexMin. detectable amount: SO2+ SOF2, H2S and HF ≤0.1µl/L, CO≤0.5µl/L, ... /L, whichever is greater; CO≤±2 or ±0.5µl/L, whichever is greater; HF≤±2% or ±0.1µl/L, ...