| US 7,396,512 B2 | ||
| Automatic precision non-contact open-loop fluid dispensing | ||
| Nicholas M. DiTrolio, Havertown, Pa. (US); and Eric L. Canfield, Chester Springs, Pa. (US) | ||
| Assigned to Drummond Scientific Company, Broomall, Pa. (US) | ||
| Filed on Nov. 04, 2003, as Appl. No. 10/700,374. | ||
| Prior Publication US 2005/0095723 A1, May 05, 2005 | ||
| Int. Cl. B01L 3/02 (2006.01) | ||
| U.S. Cl. 422—100 [73/864; 73/863.32; 73/863.83; 73/863.72; 73/864.01; 73/864.11; 73/864.15] | 20 Claims |
| 1. An electronic, hand held fluid dispensing system for use with a laboratory pipette, comprising:
a housing capable of being held in one hand;
a coupler disposed at least partially within said housing, said coupler being adapted to be removably connected to said pipette;
a source of pressure and/or vacuum;
a valve pneumatically coupled between said source and said coupler;
at least one pressure transducer pneumatically coupled to said coupler, said pressure transducer generating at least one output;
and
an electronic controller electrically coupled to control at least said valve and also electrically coupled to said pressure
transducer, said electronic controller operating in an open-loop mode to control said valve in accordance with a valve control
timing parameter derived from said pressure transducer output and a stored quantity parameter relating to a desired quantity
of fluid to be dispensed, said valve control timing parameter controlling said valve so that said system automatically, repetitively
dispenses substantially a predetermined quantity of fluid from said pipette.
|