Method and apparatus for titrating liquids

Claim 2

Apparatus for transferring liquid titrant from a reservoir to an outlet and indicating liquid quantity transferred, comprising: conduiting means interconnecting the reservoir and outlet; pumping means interconnected with said conduiting means including a body member with a cavity interconnected with said conduiting means, piston means disposed within said cavity, and an actuator providing relative translatory movement between the body member and piston means when rotated in a first direction to move titrant from the reservoir, and when rotated in the second direction to move liquid to the outlet; electric signal generating means including a resistance potentiometer having a slide contact that is secured to said pumping means actuator whereby said slide contact is adjustably positioned on rotation of said actuator for adjusting the electric signal magnitude as a function of actuator rotative movement; and electric signal readout means conNected to the signal generating means for providing an indication of liquid amount transferred.

Claim 3

Apparatus for transferring a liquid titrant from a reservoir to an outlet and indicating the quantity of titrant transferred, comprising: conduiting means interconnecting the reservoir with the outlet; pumping means interconnected with said conduiting means including a body member with a cavity in fluid communicating relation with said conduiting means, piston means disposed within said cavity, and an elongated rodlike actuator providing relative translatory movement between the body member and piston when rotated axially about its long dimension in a first direction to move titrant from the reservoir, and when rotated in the second direction to move liquid to the outlet; electric signal generating means including a resistance potentiometer having a slide contact secured to said rodlike actuator, which slide contact is adjustably positioned on rotation of said actuator to provide an electric signal of magnitude functionally related to titrant transferred by said pumping means; and means responsive to said electric signal for providing a digital display of units of titrant transferred by said pumping means.

Claim 4

Apparatus for transferring a liquid titrant from a reservoir to an outlet and indicating the quantity of titrant transferred, comprising: conduiting means interconnecting the reservoir with the outlet; pumping means interconnected with said conduiting means including a body member with a cavity in fluid communicating relation with said conduiting means, piston means disposed within said cavity, and an elongated rodlike actuator providing relative translatory movement between the body member and piston when rotated axially about its long dimension in a first direction to move titrant from the reservoir, and when rotated in the second direction to move liquid to the outlet; electric signal generating means including a resistance potentiometer having a slide contact secured to said rodlike actuator, which slide contact is adjustably positioned on rotation of said actuator to provide an electric signal of magnitude functionally related to titrant transferred by said pumping means; and means responsive to said electric signal for providing a digital display of units of titrant transferred by said pumping means.

Claim 5

Apparatus for transferring liquid from a reservoir to an outlet and providing an indication of liquid quantity transferred, comprising: liquid conduiting means interconnecting the reservoir and outlet; pumping means interconnected with the liquid conduiting means, said pumping means including a piston received within a cylinder and threaded drive means rotation of which in a first direction effects relative translation of the piston within the cylinder to transfer liquid toward said outlet from the reservoir; electric signal generating means including a resistance potentiometer with a slide contact integrally connected with said threaded drive means and adjustably positioned on rotation of said drive means; first and second electric circuit means of individually selectively adjustable impedance; switch means selectively actuable to interconnect the potentiometer with the first or second circuit means in a Wheatstone bridge varying the electric signal magnitude per unit of element movement in accordance with the adjustment and connection of said circuit means; and readout means connected to the signal generating means for providing readout indication of liquid amount transferred.

Claim 6

Apparatus for transferring liquid from a reservoir to an outlet and providing an indication of liquid quantity transferred, comprising: liquid conduiting means interconnecting the reservoir and outlet; pumping means interconnected with the liquid conduiting means, said pumping means including a piston received within a cylinder and threaded drive means rotation of which in a first direction effects relative translation of the piston within the cylinder to transfer liquid toward said outlet from the reservoir; electric signal generating means including a resistance potentiometer with a slide contact integrally connected with said threaded drive means and adjustably positioned on rotation of said drive means; first and second electric circuit means of individually selectively adjustable impedance; switch means selectively actuable to interconnect the potentiometer with the first or second circuit means in a Wheatstone bridge varying the electric signal magnitude per unit of element movement in accordance with the adjustment and connection of said circuit means; and readout means connected to the signal generating means for providing readout indication of liquid amount transferred.

Claim 7

Apparatus as in claim 3, in which there are further provided first valving means located in the conduiting means between the pumping means and reservoir, second valving means in the conduiting means located between the pumping means and the outlet, and means for actuating the first and second valving means to opposite states for providing unidirectional liquid transfer.

Claim 8

Apparatus as in claim 3, in which said first and second electric circuit means are adjustable to a relative impedance that said readout means provides a direct indication of the concentration of a component material of said liquid transferred.