What terminology is used for communicating level measurement concepts in general?
POINT LEVEL: Material level distance as measured from the vessels bottom. POINT LEVEL DETECTION: Level detection at the desired height from the bottom of the vessel in terms of a switching function. HIGH LEVEL: Maximum level at which vessel full indication is required. LOW LEVEL: Minimum level at which vessel empty indication is required. HIGH HIGH LEVEL: Above maximum expected level. LOW LOW LEVEL: Below minimum expected level. PUMP CONTROL LOGIC: As applied to overhead tank level control, the pump is STOPPED if the level is equal to or greater than the maximum desired level and does not RESTART until the level is equal to or less than the minimum desired level. Thus the level is maintained between the minimum and maximum point levels. As applied to sump level control, the pump is STOPPED when the level is equal to or less than the minimum desired level and RESTARTED when it is equal to or greater than the maximum desired level. Thus the level is maintained between the minimum and max
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