Controlled fluid transfer system

A system for controlled transfer of at least two fluids through lines between at least two reservoirs and a vessel in a manner to provide respective flow-related parameters at selected values, comprising:

• (a) a first pressurizable reservoir to contain a quantity of said first fluid;
• (b) a fluid vessel to contain a different quantity of said first fluid;
• (c) a first conduit means connected at one end to said first reservoir and at the other end to said vessel, to transfer said first fluid between them;
• (d) means to control the flow of said first fluid in said first conduit, including means to pressurize said first reservoir in a positive or negative sense with respect to atmospheric pressure, to provide a pressure difference between between said first reservoir and said vessel, that will cause fluid to flow in either direction through said first conduit between said first reservoir and said vessel, depending on the sense of the pressure difference;
• (e) first reference means to provide an electrical signal related to a selectable value of a flow related parameter for said first fluid;
• (f) first means to provide an electrical signal related to the measured value of said flow-related parameter for said first fluid;
• (g) first means to compare the electrical signal outputs of said first reference means and said first flow-related parameter measuring means, and to provide an electrical signal output related to their difference;
• (h) means, including a microcomputer, responsive to said electrical signal output of said first comparator means to adjust said first fluid flow control means, in a direction and with a magnitude to provide the selected value of said first flow-related parameter;
• (i) a second pressurizable reservoir to contain a quantity of a second fluid;
• (j) a second conduit means connected at one end to said second reservoir and at the other end to said vessel to transfer said second fluid between said second reservoir and said vessel;
• (k) means to control said second fluid in said second conduit means, including means to pressurize said second reservoir;
• (l) second reference means to provide an electrical signal related to a selectable value of a flow-related parameter for said second fluid;
• (m) second measuring means to provide an electrical signal related to the measured value of said flow-related parameter for said second flank;
• (n) second comparator means to compare the electrical signal outputs of said second reference means and said second measuring means, and to provide an electrical signal output related to their difference;
• and
• (o) means including a microcomputer, responsive to said electrical signal output of said second comparator means to adjust said second fluid control means in a direction and with a magnitude to provide the selected value of said second flow-related parameter.