Gauge glass level discrepancy

This discrepancy between the apparent level, in the gauge glass, and the actual level (see Fig. 6.1), in the tower, also occurs in any other type of level-measuring device. This includes external float chambers, kidneys, displacement chambers, and level-trols. The one exception to this is level-measuring devices using radiation techniques. 

After all, the external level indication chamber (level-trol) holds just water. When we look at the gauge glass, it has water, not steam. Hence, the indicated water level outside the drum is less than the boiling water level inside the drum. This discrepancy causes water carry-over with the steam due to high boiling water levels. 

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See also in sourсe #XX -- [ ]

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