monitors the flow rate of the fluid being transferred from the supply containers 16 and 18 to the receiving container 20 the device 12 includes alarms for alerting personnel of conditions of no flow low flow or high flow in the system thereby indicating malfunctions such as empty supply containers broken transfer tubing line blockage malfunctioning of pumps or simultaneous pump operation fluid flow monitoring for delivering a predetermined amount of fluid is accomplished in the present invention by the comparison of fluid weights taken at preselected time intervals this can be explained by the expression of flow rate equalling weight change times a constant specific gravity divided by the time interval this mode of monitoring flow rates is more accurate and more economical than the indirect measurement of fluid speed by ultrasonic transducers and the like or by the slow and costly volume chamber method in accordance with the above described premise a weight sensor or detector 26 such as a load cell strain gauge or the like detects the weight of the receiving container and relays this information through a line 28 to a control module 30 the control module 30 includes means for comparing each pair of consecutive weights taken at succeeding times to determine if there has been a weight gain from the preceeding detected weight if there has not been a weight gain an alarm 32 is sounded indicating lack of fluid flow from the supply containers 16 and 18 to the receiving container 20 representing empty supply containers breach of the tube or the like a delay means down counter or clock 34 is utilized to select the weight at the desired preselected times for use with the comparing means.