To supply concentrate solution of mold release agent to spray it on, for example, a metallic mold surface of a die-cast machine, by detecting presence/absence of the spray and exactly measuring and trapping the spray even if a spray amount is minute when spraying.
Fluid L is guided out of a fluid supply source T and then is guided in a part N to which fluid is supplied, along a fixed direction with piston pressure. A fluid supply device comprises: a supply block body 2 which has a storage/supply chamber 3 storing the liquid L, an inlet part 4 communicating with the storage/supply chamber 3 and connected with the fluid supply source T, and an outlet part 6 connected with the part N are formed; a supply piston head 1 slidably disposed in the storage/supply chamber 3 to guide the liquid L out of the storage supply chamber 3 by pressing, and to guide the liquid therein by sucking; and detection means 13, 15 detecting whether or not the supply piston head 1 is moved, or detecting a distance.
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