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As shown in the above diagram out of three sensors, 1 sensor put at the bottom, 1 sensor put at middle, and 1 sensor at top level of the tank. When the water level in the tank becomes low, means water get down from middle sensor, motor get switch on automatically. The tank starts filling up. When the water level reaches to the higher level, the top level sensor sense. the motor automatically gets switched off. No Man power is required. Supply voltage : 220-270 V AC, Suitable up to 2HP Motor. Also suitable for single phase MCB starter panel & submersible motor. Auto and manual switch available. Sensing Elements: Carbon sensors, so that it is free from oxidation. Long life.Every care is taken for packing so that the item reaches to the buyer safely and undamaged. Manufacture in Ahmedabad. Made In India Product.