by the trailing edge of the pulse from schmitt trigger 42 as a control voltage to pulse generator 38 it should be noted that this feature of the invention is highly suited in situations where highly viscous fluids are delivered via filters or when high arterial pressures are encountered presenting a need for forces greater than the hydrostatic gravity produced force to maintain the desired flow rate it is possible to use air pressure in the intravenous flask under these conditions the flow rate may be so high that it will produce continuous fluid flow instead of a drop formation the system will continue to work as soon as the liquid bridges the gap between the drop detector electrodes a signal is generated to close the clamp because of continuous flow conditions the amount of liquid produced will be much larger than the ordinary drop however this increase in drop size will be reflected as an increase in duration of the drop detection signal and this information is used to adjust the time for the next drop initiation pulse by pulse generator 38 so that volumetric flow rate is maintained at the exact rate desired drop generation time the time between the pulse from pulse generator.