Enhanced time-based proportional control
First Claim
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1. A process for time-based proportional control of chemical values in a water treatment system wherein a measured signal value is generated, comprising the steps:
- selecting an offset sensitivity value; and
calculating a setpoint offset value (SOV) to determine said measured signal value;
wherein said measured signal value approximates an ideal proportional control response, and wherein said setpoint offset value is calculated according to the formula
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Abstract
The instant invention is a device and method for its use which includes the addition of a deviation compensation function effective to automatically adjust the offset used in time-based proportional control. Inclusion of this improvement finds particular utility in situations like public pools where daily bather load varies depending on weather and other unpredictable factors.
157 Citations
14 Claims
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1. A process for time-based proportional control of chemical values in a water treatment system wherein a measured signal value is generated, comprising the steps:
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selecting an offset sensitivity value; and
calculating a setpoint offset value (SOV) to determine said measured signal value;
wherein said measured signal value approximates an ideal proportional control response, and wherein said setpoint offset value is calculated according to the formula
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2. In a process for time-based proportional control of chemical values in a water treatment system wherein a measured signal value is generated, the improvement comprising:
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modifying said measured signal value to be within a range defined by a particular proportional band width;
verifying that said signal value likes within a hysteresis value about a particularly defined setpoint;
measuring said signal value to confirm that said signal value is steady or retreating from said setpoint during a selected time duration;
selecting an offset sensitivity value; and
calculating a setpoint offset value (SOV) according to the formula - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification