Features 1) integration of the units, fully automatic control, compacted, easy for carrying and especially suitable to operation in field operation. 2) an on-site testing of the withstand voltage of oil as and after purified, automatic printout of test results is available. 3) imported parts are used for all electric system which ensures operation of the equipment with high performance. 4) function of real time analysis and testing of general performance of purifiers is available. 5) a unique gas/water removal system adopting stereo-evaporation technology which rapidly separates the water and gas content in the oil and the system is free of maintenance. 6) a superior purification system with top quality filter core, which can accommodate large quantity of dirt, and is densified progressively step by step. The filter core has got a high precision and multiple-stage filtration 7) safe, reliable heating system and optimized piping design ensure that there is no "dead angle" and oil is completely subjected to purification. 9) an advanced infrared liquid level control system which automatically controls the level of oil in and out. 10) purifiers are equipped with an interlocked safety protective device. I. E, backflow of a oil outlet over pressure can be achieved via an overflow valve; b oil inlet will interlock with heating system.