CHEMICAL DISPENSING SYSTEMS AND POSITIVE DISPLACEMENT FLOW METERS THEREFOR
First Claim
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1. A chemical fluid dispensing system, comprising:
- a controller having a microprocessor and a user interface;
a first pump for pumping a first fluid through a first fluid line into a mixing chamber;
a second pump for pumping a second fluid through a second fluid line into the mixing chamber;
a first flow meter disposed in said first fluid line;
a second flow meter disposed in said second fluid line; and
a feedback loop extending from each of said first and second flow meters back to said controller, for closed loop control of said system.
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Abstract
A volume-based, rather than time-based, system for dispensing fluid incorporates a microprocessor-based controller, software, pump, and positive displacement flow meter. The volume being pumped and the time it takes to pump that volume is calculated and tracked by the software, giving a flow rate. This rate is then tracked by the software for any changes. Any conditional changes that occur, affecting this rate, are tracked, and if the rate becomes too excessive outside of the normal rate established at initial calibration, then an alarm or other indication is provided to the operator.
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Citations
24 Claims
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1. A chemical fluid dispensing system, comprising:
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a controller having a microprocessor and a user interface; a first pump for pumping a first fluid through a first fluid line into a mixing chamber; a second pump for pumping a second fluid through a second fluid line into the mixing chamber; a first flow meter disposed in said first fluid line; a second flow meter disposed in said second fluid line; and a feedback loop extending from each of said first and second flow meters back to said controller, for closed loop control of said system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A positive displacement flow meter, comprising:
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a flow meter housing, comprising a flow meter body having a gear cavity, a fluid inlet, a fluid outlet, a gear cover assembly, and a sensor cover; a gear which may be disposed on a first gear post in said gear cavity; a gear-magnet assembly which may be disposed on a second gear post in said gear cavity; and a sensor for counting rotations of the gear-magnet assembly. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method of calibrating a fluid dispensing system, comprising:
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pumping a liquid, having known flow characteristics, through a flow meter and into a reservoir having a known or measurable volume; counting the number of rotations of a gear in the flow meter while the known volume of fluid is pumped through the flow meter; and recording said number of rotations and the known volume of fluid. - View Dependent Claims (22, 23)
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24. A method of modifying a fluid flow capacity of a positive displacement flow meter comprising a flow meter body having a gear cavity, a fluid inlet, and a fluid outlet, the method comprising:
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removing a first gear cover assembly having a protruding step which extends a particular distance downwardly into the gear cavity when the first gear cover assembly is attached to the flow meter body; removing a first set of gears having a first predetermined vertical height from said gear cavity; replacing said first set of gears with a second set of gears having a second predetermined vertical height; and attaching a second gear cover assembly having a protruding step which extends a different particular distance downwardly into the gear cavity to said flow meter body.
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Specification