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if u r talking about digital water level indicator den it's here:-

it consist of 3 parts mainly...a slab, a circular rotating potentiometer & a digital display screen .

the slab is tied with a rope or thread and put in d tank with d rope going over a pulley and a weight tied at d other end whose weight is slightly less than d weight of slab. so when water level increases in d tank ,the effective weight of d slab decreases w.r.t d outside hanging weight due to buoyancy . therefore d slab goes up rotating d pulley which is actually a circular potentiometer...hence due to d rotation of potentiometer d voltage across d two points changes in d circuit of potentiometer that voltage is sent to voltage display screen frm where it is calibrated with d water level of d tank....

after calibration we know d corresponding voltage fr d max. allowable water level so we set alarm for dat voltage...hence d alrm goes on when dat particular voltage is sensed.

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15y ago

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