Readings can be taken from the top down or bottom up. Examine the application to determine the right instrument and technique. In most applications, level measurements need to be quantified and sent electronically to an automation system, which requires some type of instrument. Sorting through the instrument selection process begins by determining what data is needed for the application and how it can be obtained as simply as possible. Level measurements are generally concerned with these points: 1. Level of liquid--How close is the vessel to being full or empty? 2. Volume of liquid--How many liters or gallons is in the vessel? 3. Level has reached a high limit--Will the vessel overflow? 4. Level has reached a low limit--Will the vessel run dry?
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