Importance

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Abstract

A pipetting system for dispensing multiple liquids into a single receptacle includes a plurality of liquid reservoirs, a plurality of syringes for aspirating preselected quantities of liquids from the reservoirs, and a common dispensing head connected to all the syringes for simultaneously receiving the preselected quantities of liquids from a plurality of the syringes and simultaneously dispensing the liquids into the reservoir. The system also includes means for simultaneously aspirating the preselected quantities of liquids from the reservoirs into the syringes. In addition, the system includes aspirating means for withdrawing a liquid sample from a container into the dispensing head at an aspirating position, means for storing the aspirated sample while the dispensing head is moved from the aspirating position to a dispensing position, and means for dispensing the aspirated sample to the dispensing head simultaneously with the dispensing of the preselected quantities of other liquids. The dispensing/aspirating head is mounted for vertical movement in both the dispensing and aspirating positions to permit the lower end of the head to be lowered into both the aspirating container and the dispensing receptacle, and means are provided for automatically stopping the downward movement of the head at different preselected elevations in the dispensing and aspirating positions, and means for adjusting those preselected elevations.

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First Claim