Level DetectorsLEVEL DETECTORSLEVEL DETECTORSLiquid level measuring devices are classified into two groups: (a) direct method,and (b) inferred method. An example of the direct method is the dipstick in yourcar which measures the height of the oil in the oil pan. An example of theinferred method is a pressure gauge at the bottom of a tank which measures thehydrostatic head pressure from the height of the liquid.EO 1.1 IDENTIFY the principle of operation of the followingtypes of level instrumentation:a. Gauge glassb. Ball floatc. Chain floatd. Magnetic bonde. Conductivity probef. Differential pressure (DP)GaugeGlassA very simple means by which liquid level is measured in a vessel is by the gauge glass method(Figure 1). In the gauge glass method, a transparent tube is attached to the bottom and top (topconnection not needed in a tank open to atmosphere) of the tank that is monitored. The heightof the liquid in the tube will be equal to the height of water in the tank.Figure 1 Transparent TubeRev. 0 Page 1 IC-03
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