Detect the fault of SF6 circuit breaker, Instrument transformer, switchgear, GIS, bushing, surge arrester, transformer ... detector Intelligent expert to detect inner faults of SF6 circuit breaker, instrument transformer,GIS (Gas Insulated Substation), transformer and ... produced by SF6 electrical equipments faults. JH 4000series meansure fault gases content, SF6 purity and moiture, giving precise ...