Precision dispensing system
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United States of America Patent
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-
May 5, 1998
Grant Date -
N/A
app pub date -
Sep 19, 1995
filing date -
Sep 19, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A microprocessor controlled precision dispensing system (PDS) introduces an additive into a flowing liquid. A fixed amount of additive is introduced per unit volume of the liquid. The fixed amount can be changed by the user and can be varied as a function of an external parameter. The PDS includes a dispensing device which is actuated by a flow meter. The liquid flows through the flow meter which includes a Hall effect transducer which measures flow rate. The signal from the Hall effect transducer is input into a microprocessor mounted in the dispensing device. The microprocessor controls a stepper motor which drives a crankshaft which drives a reciprocating pump. The release of the additive is correlated to the volume of liquid flow. The dispensing device includes means for selecting the amount of additive to be dispensed per gallon of liquid. For example, the system can be set to dispense an amount from 0-10 ml/gal; this amount can be changed by increments of 0.01 ml. Also included are means to accumulate the total amount of additive dispensed. The microprocessor can also be programmed to vary the amount dispensed as a function of some external parameter.
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