Patent ID: 8802032
Filing Date: 2014-08-12
Classification: B01L,G01N,Y10T

Abstract:
1. A dispensing apparatus comprising: a syringe having a plunger driven by a stepping motor as a power source; a nozzle for sucking gas and liquid with the driving motion of said syringe; a flow channel for connecting the nozzle with the syringe; at least one power transmission unit for transmitting power from a rotation output shaft of the stepping motor to the plunger; and an electrode for detecting a change of a current or voltage for detecting a boundary surface between a gas layer and a liquid layer in the flow channel when the plunger is driven in case that a gas and liquid are in the flow channel, wherein the amount of idling of the stepping motor before and after the stepping motor driven in reverse direction is calculated on the basis of a time at the boundary surface between a gas layer and a liquid layer passing through the electrode and the amount of the movement of the plunger.