LEVEL DETECTORSLevel DetectorsFigure 1 (a) shows a gauge glass which is used for vessels where the liquid is at ambienttemperature and pressure conditions. Figure 1 (b) shows a gauge glass which is used for vesselswhere the liquid is at an elevated pressure or a partial vacuum. Notice that the gauge glasses inFigure 1 effectively form a "U" tube manometer where the liquid seeks its own level due to thepressure of the liquid in the vessel.Gauge glasses made from tubular glass or plastic are used for service up to 450 psig and 400°F.If it is desired to measure the level of a vessel at higher temperatures and pressures, a differenttype of gauge glass is used. The type of gauge glass utilized in this instance has a body madeof metal with a heavy glass or quartz section for visual observation of the liquid level. The glasssection is usually flat to provide strength and safety. Figure 2 illustrates a typical transparentgauge glass.Figure 2 Gauge GlassIC-03 Page 2 Rev. 0
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