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<p>Dear All</p>
<p>in a differential controller what is the upper dead band? I know that when the difference of Th and Tl is lower than "lower dead band temperature" the controller will actand , for example , the pump will be turned off. but for the difference higher lower
than "upper dead band" and also higher than it, the pump is turned on !</p>
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<p>Thank you</p>
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Ahmad abbasianzadeh</div>
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Solar energy Researcher</div>
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Pensylvania</div>
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