Pipetting System Technology

Aspiration and dispense of the liquid sample are driven by vacuum or positive pressure. In order to allow high performance at low volumes down to 25 nL, the dispenser uses a system liquid that acts as hydraulic medium to transmit pressure as the solenoid valve opens. The system liquid allows large liquid acceleration, necessary to reach a jetting speed at the nozzle within miliseconds, ensuring clean jet start and breakoff at the valve closure.

As the valves opens, the inline MEMS Flow sensor measures the instantaneous flow rate, which is integrated in real time by the electronic controller. When the volume set point is reached, the electronic controller closes the valve, ensuring a high precision, independent of the sample liquid properties.

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