more electrical leads 44 may be configured to receive a signal transmitted from the flow sensing element 42 corresponding to the sensed flow rate of a fluid flowing through flow channel 42 via one or more traces provided on the package substrate 40 in some cases the one or more electrical leads 44 may include a metal however any suitable conductive material may be used as desired fig7 is a graph showing output variations of an illustrative flow sensor having porous inserts in the flow ports in the illustrative example the porous inserts may include a polyethylene material having a pore size of 45 pores per inch ppi and a length of about 6 35 millimeters 0 25 inches as illustrated the graph shows forty consecutive data points or readings from a digital output of the flow sensor having a fluid flow of 1000 standard cubic centimeters per minute sccm in the illustrative example the digital output is measure in u201c counts u201d where there are 6 55 counts per sccm the data points or readings from the flow sensor can be obtained at 1 millisecond intervals to help illustrate the variations in the digital output of the flow sensor the digital output is normalized to the.