Patent ID: 6604555
Filing Date: 2003-08-12
Classification: F17C,G01F,Y10T

Abstract:
A chemical refill system which comprises:(a) at least one primary liquid chemical reservoir; (b) at least one secondary liquid chemical reservoir; (c) a distribution means for supplying a carrier gas to said chemical refill system; (d) a conduit for connecting said means for supplying said carrier gas, said primary liquid chemical reservoir, and said secondary liquid chemical reservoir; (e) at least one venturi comprising a gas inlet, a gas outlet and an exhaust gas outlet, said venturi being disposed between said distribution means for supplying said carrier gas and said primary and secondary liquid chemical reservoirs; and (f) at least one volume sensor selected from the group consisting of: optical sensor, thermal conductance sensor, capacitance sensor, weight scale, sonic sensor, nitrogen back pressure sensor, electrostatic charge sensor, float sensor, and any combinations thereof, said volume sensor being capable of monitoring the volume of chemicals remaining in said primary and secondary chemical reservoir.