Programmable additive controller
First Claim
1. Programmable additive controller apparatus for the chemical industry, comprising an inlet, a filter connected to the inlet, an additive flowmeter connected to the filter for metering additive entering the apparatus, a control valve connected downstream from the flowmeter for controlling the flow of additive from the flowmeter, the flowmeter having a signal output for indicating additive volumes flowing through the flowmeter, a controller connected to the control valve for cyclically opening the control valve upon a command pulse, the controller having an input for inputting a quantity of additive to be added on each cycle and the controller having an opener for opening the control valve, a comparator having an accumulator for accumulating signal output from the flowmeter and the controller having a comparator for comparing accumulated signal output from the flowmeter and the input quantity, and having a closing control for closing the control valve and preventing further flow of additive when the accumulated flowmeter signal output approaches the input quantity, and further comprising an output connected to the flowmeter for injecting the additive into a main product flow.
1 Assignment
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Accused Products
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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Citations
21 Claims
- 1. Programmable additive controller apparatus for the chemical industry, comprising an inlet, a filter connected to the inlet, an additive flowmeter connected to the filter for metering additive entering the apparatus, a control valve connected downstream from the flowmeter for controlling the flow of additive from the flowmeter, the flowmeter having a signal output for indicating additive volumes flowing through the flowmeter, a controller connected to the control valve for cyclically opening the control valve upon a command pulse, the controller having an input for inputting a quantity of additive to be added on each cycle and the controller having an opener for opening the control valve, a comparator having an accumulator for accumulating signal output from the flowmeter and the controller having a comparator for comparing accumulated signal output from the flowmeter and the input quantity, and having a closing control for closing the control valve and preventing further flow of additive when the accumulated flowmeter signal output approaches the input quantity, and further comprising an output connected to the flowmeter for injecting the additive into a main product flow.
Specification