Patent ID: 7032461

Claim:
A flow sensor comprising: a sensor head section which comprises: a case having six faces, wherein at least two of said faces each include an opening disposed therein, a pipe line through which the fluid passes, said pipe line being disposed so as to pass through the opening disposed in each of said at least two of said faces of said case, a detector for detecting a flow quantity of the fluid, and a flow indicator having a plurality of light emission sections disposed on one of said faces of said case and turning on at least one of said plurality of light emission sections, so as to indicate the flow quantity of the fluid by at least one of a speed of cycling light through said plurality of light emission sections and the number of said plurality of light emission sections emitting light, and wherein one of said faces of said case consists of said plurality of light emitting sections of said flow indicator and a planar face whereby the width of said case is minimized by using said plurality of light emitting sections disposed along the longitudinal direction of said pipe line; and a sensor main section provided as a separate body from said sensor head section which comprises a display section for displaying a value of the flow quantity as a numeric value, and an output section for outputting a signal based on the value of the flow quantity.