QSK series air compressor pressure control is suitable for ordering start and stop of all kinds of air compressor by means of pressure variance in the pressure tank. When pressure inside the pressure tank reaches the upper limit, the pressure control will automatically cut off the power and stops the compressor. When pressure inside the pressure tank drops till the lower limit, the controllers will automatically connect the power and the compressor starts working. The whole cycle of controlling is a full-automatic one and no more personal attention will be needed. It is an indispensable automatic control device for air compressor. Since it is a kind of automatic control, air inside the tank can be stabilized within a certain range. At the same time, it can keep the air compressor and its motor at intermittent work. In this way, it greatly improves the efficiency of air compressor and extends its life and saves electricity power. 

Principle for Selection:
The choice of the correct models of QSK series air compressor pressure control depends on the power consumption and pressure range of the air compressor. Usually, the cut-out pressure of the controller shall be equal to the upper pressure limit of the compressor and its cut-in pressure shall be same as the lower pressure limit of the compressor.