A food canning is needed highly for the market, it is fish canning. Fish canning is a food process that produces the canned foods from some fish (e.g. tuna, mackerel, and sardines). Inspecting a canned foods factory found that sauce filling is a step of fish canning process that makes a lot of quantities of sauce loss. In-line gravity sauce filling equipment is used to filling sauce into cans with sardines. This type of sauce filler causes fluctuation of sauce flow rate into cans, which leads to the possibi