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TERMINAL OBJECTIVE - h1013v1_63
Figure 2    Gauge Glass

Instrumentation and Control Volume 1 of 2
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Level Detectors LEVEL DETECTORS LEVEL DETECTORS Liquid 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 your car  which  measures  the  height  of  the  oil  in  the  oil  pan.    An  example  of  the inferred method is a pressure gauge at the bottom of a tank which measures the hydrostatic head pressure from the height of the liquid. EO 1.1 IDENTIFY  the  principle  of  operation  of  the  following types of level instrumentation: a. Gauge glass b. Ball float c. Chain float d. Magnetic bond e. Conductivity probe f. Differential pressure (DP) Gauge Glass A 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 (top connection not needed in a tank open to atmosphere) of the tank that is monitored.   The height of the liquid in the tube will be equal to the height of water in the tank. Figure 1    Transparent Tube Rev. 0 Page 1 IC-03







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