air bubbler liquid level detector; A device for indirectly measuring the level of liquid in a vessel especially a corrosive liquid, viscous liquid or liquid containing suspended solids; it consists of a standpipe open at the bottom and closed at the top, which is connected to an air supply whose pressure is maintained slightly above maximum head of liquid in the vessel; air bubbles out of the bottom of the pipe, maintaining the internal pressure equal to the head of liquid in the vessel, pressure being measured by a simple gauge or transducer.
algorithm; A prescribed set of well defined rules or processes for the solution of a problem in a finite number of steps
alias; When varying signals are sampled at equally spaced intervals, two frequencies are considered to be aliases of one another if they cannot be distinguished from each other by an analysis of their equally spaced values.
aliasing; False signals in the frequency domain caused by a measuring rate for digitising that is too slow.
alkalinity; Represents the amount of carbonates, bicarbonates, hydroxides and silicates or phosphates in the water and is reported as grains per gallon, or ppm, as calcium carbonate.
ambient; A surrounding or prevailing condition, especially one that is not affected by a body or process contained in it.
ambient air; 1. Air to which the sensing element is normally exposed. 2. The air that surrounds the equipment. The standard ambient air for performance calculations is air at 80°F, 60% relative humidity, and a barometric pressure of 29.921 in. Hg, giving a specific humidity of 0.013 lb of water vapour per lb of air.
ambient conditions; The conditions (pressure, temperature, etc.,) of the medium surrounding a given device or equipment.
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