Patent ID: 7434589

Claim:
A wafer treating apparatus comprising: a tank vessel for use in containing liquid into which a wafer is dipped; a pump connected to said tank vessel for pumping liquid from the tank vessel; and a pump malfunction anticipation unit operatively connected to said pump so as to operate at the same time as the pump, said pump malfunction anticipation unit include a calculator configured to calculate the flow rate of liquid being pumped by the pump, and a comparator that compares the flow rate calculated by said calculator with a preset value, whereby a malfunctioning of the pump can be anticipated, wherein said pump comprises a bellows that reciprocates from side to side in the pump to create a pumping action that pumps the liquid from said tank vessel, and a left proximity sensor and a right proximity sensor disposed at both sides of the pump, such that said left proximity sensor is actuatable when the bellows moves proximate said left proximity sensor, and said right proximity sensor is actuatable when the bellows moves proximate said right proximity sensor.