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Drainage pump switch

LABSPROJECT
Based on a Labs project | October 2011 | Find it here
Drainage pump switch
Most drainage pumps are fitted with a level swttch that provides a hysteresis of 1O~15 cm. When small volumes are drained, the liquid runntng back in the hose will increase the hysteresis by 3-5 cm. The hysteresis can be reduced appreciably by the present circuit.
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