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What is difference gap control ?

Differential gap control is similar to on off control except that a band or gap exists around the control point.

Use: 
In industry differential gap control is often found in non critical level control applications where it is desirable only to prevent a tank from flooding or drying. When a measured variable exceeds the upper gap the control valve will open fully or be closed fully. Similarly when it exceeds the lower gap it will open or close fully.

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