Answer / faiyaz ahmad

Level troll is process or technique which is used to measure level in close tank or vessel
calibration of level troll weight the displacer and measure the diameter of displacer through vernier caliper after that calculate in computer then i will hookup link in apparatus and then
25% 50% 75% 100% again reverse 75% 50% 25% o% 4 mA 8mA 12mA 16mA 20mA

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