Compact target flow meter

A flow measurement device comprising:

• a. A rigid housing defining a flow channel having a channel input and a channel output, the flow channel being configured to allow a fluid medium to flow from the channel input to the channel output;
• b. A moving member mounted within the flow channel, and extending transverse to a direction of flow of the fluid medium, the moving member comprising a moving member magnet, the moving member magnet operatively moving on exposure to a drag force resultant from fluid passing in the flow channel;
• c. A fixed magnet, provided at least proximal to a side-wall of the flow channel, the fixed magnet having like polarity with respect to moving member magnet, and being arranged to operatively exert a consistent repulsive force on the moving member magnet thereby limiting its displacement proportionally to the magnitude of the drag force exerted by the fluid flow, so to linearise a relationship between a rate of flow of the fluid medium and moving member magnet displacement;
• d. A sensing element located relative to the moving member magnet and configured to provide an output indicative movement of the moving member magnet within the flow channel;
• and
• wherein the moving member magnet comprises a permanent magnet located transverse to the fluid flow, whose displacement is parallel to the direction of flow of the fluid medium and which is connected to a support parallel to the direction of flow of the fluid medium, and where the fixed magnet is placed downstream, in a middle of the flow channel and transverse to the fluid flow.