Dual integral ballast flow sensor

A package for a sensor for sensing a flow of a gas, comprising:

• a body having an inlet port, an outlet port and a passage in operational communication with said inlet and outlet, said inlet having an axis of flow substantially different to an axis of flow through said passage;
• support means for supporting the flow sensor within said passage;
• said support means further sealing said passage such that said gas may only enter said passage through said inlet port and exit through said outlet port, said support means also establishing a space between said ports and said sensor, the space volume is adjusted to provide between the plugs an air volume for the sensor such that a low pass filter effect is established such that high frequency changes in the air flow are removed as noise from the sensor output;
• and
• first and second flow restrictors located one in the inlet port and one in the outlet port and comprising substantially identical plugs with an inlet side and an outlet side and each being formed of material having substantially no linear but numerous convoluted through-passages therein which allow the fluid of interest to pass therethrough from said inlet to outlet side of each said plug.