Programmable additive controller

Details Programmable additive controller Programmable additive controller

1992-05-18

1993-12-21

Huson, Gregory L.

Dispensing

Cutoff operated by selectively preset volume or rate of...

Operating cycle including reset to starting position

222 57, 222 71, 222642, 13762413, 377 16, B67D 530

Patent

active

052715264

ABSTRACT:
Programmable additive controllers control flow of fluid additives from a fluid supply line. A flowmeter is connected to the solenoid control valve for measuring flow of fluid. A controller opens and closes the control valve. The control valve is positioned downstream from the flowmeter, leaving the meter full upon shut off. A settable input controls cyclic operation of the controller. The controller further incorporates an input for required quantities of additive to be added on each cycle. A comparator in the controller compares a required quantity with signal output indicating flow through the flowmeter. The difference, if any, between actual flow and target flow is continuously sent, and the target flow is continuously adjusted up or down when necessary to compensate for the previous difference. The comparator connects to a closing control for closing the control valve and preventing further flow of additive when the cumulative flowmeter output signal approaches the requirement. Condition specific alarms signal the user and controller during operation if over or under injections are detected. Over injections relayed by the alarm to the controller cause a closing of the valve. A secondary alarm is provided for signalling if the apparatus continuously injects for over a given time period. A three-way valve connects to the flowmeter for selectively flowing fluid additive to a test and to an outlet for ejection into a mixing tank. The controller has an input for local panel factor and reads out mixing ratio volume per cycle and total volume of additive.

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patent: 5118008 (1992-06-01), Williams

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