1. Test SO2+SOF2, H2S, HF, CO 2. Test SF6 purity and moisture 3. Detect the ... other SF6 electrical equipments ----Test SO2+SOF2, H2S, HF, SF6 purity and moisture in just a single machine orseparate ... their earliest stage. SO2+SOF2, H2S, CO and HF are produced by SF6 electrical equipments faults. JH 4000series ... test, 500ml/min*Minimum amount detectable: SO2+SOF2, H2S, HF: ≤0.1µl/L (ppm)Purity: ≤0.03% ...