Method and device for measuring the volumetric flow of a fluid
First Claim
1. A device for measuring volumetric flow of a fluid, comprising:
- a movable element arranged to move cyclically and having a cycle frequency, said element generating measurement signals; and
a transducer for receiving the measurement signals, said transducer including;
means for determining the cycle frequency from the measurement signals, means for modifying the measurement signals into weighted signals using a stored correction factor corresponding to the frequency, wherein each measurement signal is weighted by a volume value of the correction factor, means for totaling the weighted signals, and means for generating a counter signal when the total of the weighted signals has reached at least one of a standard volume level and a multiple of the standard volume level.
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Abstract
The present invention provides a flow meter whereby movement of fluid causes screw spindles or other movable elements to rotate and generate electronic pulses. The invention compensates for non-linearity in the relationship between the flow rate and the number of pulses, occurring particularly at low flow rates, by providing a device in the form of a transducer which assigns volume a value to each pules, which volume values are accumulated such that when certain predetermined value is exceeded a transducer generates a counter signal. Thus, the present invention enables compensation for non-linearity to be made and pulses output corresponding to a standard unit of volume.
42 Citations
27 Claims
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1. A device for measuring volumetric flow of a fluid, comprising:
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a movable element arranged to move cyclically and having a cycle frequency, said element generating measurement signals; and
a transducer for receiving the measurement signals, said transducer including;
means for determining the cycle frequency from the measurement signals, means for modifying the measurement signals into weighted signals using a stored correction factor corresponding to the frequency, wherein each measurement signal is weighted by a volume value of the correction factor, means for totaling the weighted signals, and means for generating a counter signal when the total of the weighted signals has reached at least one of a standard volume level and a multiple of the standard volume level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for measuring volumetric flow of a fluid, comprising;
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generating measurement signals with a movable element arranged to move cyclically and having a cycle frequency;
outputting the measurement signals to a transducer;
determining the cycle frequency of the measurement signals;
modifying the measurement signals into weighted signals using a stored correction factor corresponding to the cycle frequency totaling the weighted signals;
generating a counter-signal when the total of the weighted signals has reached al least one of a standard volume level and a multiple of the standard volume level; and
communicating the counter-signal to an arithmetic unit for display. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A device for measuring volumetric flow of a fluid, comprising:
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a movable element arranged to move cyclically and having a cycle frequency, said element generating measurement signals; and
a transducer for receiving the measurements signals, said transducer adapted to;
determine the cycle frequency from the measurement signals;
modify the measurement signals into weighted signals using a stored correction factor corresponding to the cycle frequency, wherein each measurement signal is weighted by a volume value of the correction factor;
total up the weighted signals to create a total;
generate a counter signal when the total of the weighted signals has reached at least one of a standard volume level and a multiple of the standard volume level; and
communicate the counter-signal to an arithmetic unit for display. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification