this invention relates to a device to monitor the administration of a fluid through a conduit , such as intravenous fluid , and detect the completion of fluid delivery by monitoring the fluid level inside a chamber . the device will monitor , through an optical fluid sensor comprising a radiation source , two sensors , a logic means , and an indicating means , the bottom half of any “ user supplied ” drip chamber that is normally full during the administration of fluids . when the fluid level in the chamber drops below a predetermined level , the indicating means will initiate an electromechanical device that releases a pinching device to occlude the conduit . the pinching device is a rotary pincher that derives its force from a torsion spring and is held in the open position by the electromechanical device .