Republic of the Philippines Department of Education



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I-C.3 Operation Design – The Set-Up Mechanism of Water Pump

Project Hydra utilized a small water pump to thrust the filtered water from the reservoir towards the cistern or the water storage tank. The pump is powered by an acid battery of 12 V and 2.1A. A mechanical relay was used to switch on the water pump on the following conditions: 1) If the green LED light is on in which indicates low level of water stored in the cistern and 2) If the yellow LED light is on in which indicates a fair level of water stored in the cistern. The water pump is automatically switched off when the red LED light is on, indicating a full tank.



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