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Answer Posted / amsal
i think he is asking about principles to measure level by different methods which are,
1. by dp xmtr based on dp principle in case of steam drum or closed tank level.
2. by the principle of head static pressure in case of open tank system.
3. by Archimedes principle which uses buoyant force etc
and others are their helping systems like displacement type level xtmr which using Archimedes principle actually,
and capactive reactance which is using in to measure pressure on the diaphragm actually of DP xtmr not for level measurement.
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