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US 5,291,780 AGranted
Flow meters
OwnerPaul D. Thomas, Cetin Mazharogluinventors
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Abstract
A flow meter of the non-moving part type comprises first and second measuring devices (1, 2) having different point characteristics and which are connected together in a series. A by-pass line (11) and valve (12) are connected in parallel with the flow meters and a third larger flow measuring device (10) is connected in series. At a given flow rate the valve opens and the third measuring device is used to measure the higher flow rates.
Claims5
A flow meter comprising:
- first and second flow measuring means having different frequency versus flow rate characteristics and which are connected together in series;
- a third flow measuring means having another frequency versus flow rate characteristics which is larger than either the first and second flow measuring means, and which is connected in series with the first and second flow measuring means upstream or downstream therefrom;
- a valve;
- and
- a by-pass passage controlled by said valve connected between upstream and downstream ends of the first and second flow measuring means to by-pass the first and second flow measuring means at a given rate of flow, including means for calculating flow rates up to said given rate comprising a comparison between the characteristics of the first and second flow measuring means, wherein said third flow measuring means is adapted to measure flow rates above the said given rate.
2 more elements
Dependencies are inferred from the claim text.