Dosing apparatus

Details Dosing apparatus Dosing apparatus

G - Physics

05

D

342/29, 341/38.3

G05D 5/06 (2006.01) A61M 5/172 (2006.01) B01L 3/02 (2006.01) F04B 49/20 (2006.01) H02P 7/00 (2006.01)

Patent

CA 1157129

ABSTRACT OF THE DISCLOSURE The metering apparatus for small volumes of liquid in the milliliter and microliter range comprises a piston/ cylinder system driven by a direct-current motor. The piston stroke is measured by means of an optical path-length measur- ing system. For this purpose, a slide-rule pulse scale pro- vided with a regular line grid is affixed to the piston. The light from a light transmitter passes through the slide-rule pulse scale and a stationary scanning plate which likewise is provided with a regular line grid, and to a light receiver. The pulses of the light receiver are digitalized in a pulse conditioning circuit and fed to a counter adapted to be pre- set by means of a coding switch. The counter position acts upon a braking and rotative-speed regulating circuit in such a way that regardless of the preset desired value of the rotative speed the speed of rotation of the motor is reduced to a small value as the final value of the counter is approached. As soon as the preset volume has been metered and the counter has reached the corresponding position, the motor is brought to a dead stop through a motor-control logic circuit with the aid of a reverse voltage. During the stopping process the no- load voltage of the motor is measured by means of a zero- voltage comparator at regular intervals. A pulse monitoring circuit serves to measure and regulate the piston-stroke speed and to turn off the motor in case of a mechanical defect. Motor and electronic systems are supplied with current from dry cells or storage batteries, a power supply being optionally provided to charge them.

360386

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