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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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How level transmitter works?
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Sentence for indicator?
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Automative water level indicator using scr?
check out this website Water Level Indicator Circuit-Liquid Level Sensor Project http://www.circuitstoday.com/simple-water-level-idicator
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