The drop method is widespread used in liquid micro-flow detection and control.The liquid micro-flow detection is a difficult point for research all the time.For this reason

a drop speed sensor is designed using a medical transfer line

a pressure sensor

and an instrumentation amplifier.The pressure sensor is used for measuring the pressure of the bottle which is attached to the medical transfer line for stock solution and then turns the pressure into a voltage

which could be converted into drop speed.The sensor hardware is designed and manufactured

and the experiments are conducted

so as to acquire the equation of the drop speed sensor.