دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: a pressure-sensing element of cylindrical shape whose walls contain convolutions that cause the length of the bellows to change when pressure is applied. bellows meter n: see orifice meter.

n: a pressure-sensing element consisting of a twisted or curved tube of noncircular cross section, which tends to straighten when pressure is applied internally. By the movements of an indicator over a circular scale, a Bourdon tube indicates the pressure applied.

n: a sensing element consisting of a thin, usually circular, plate that is deformed by pressure applied across the plate.

n: a strained sensing element installed on the strained joint of the double-barrelled elevator

n: see sensing element.

n: a device containing a mercury-in-glass thermometer, which may be inverted after the thermometer has reached thermal equilibrium with the oil in which it is immersed. The inversion breaks the mercury thread, disconnecting it from the sensing element and allowing it to run down to the other end of the thermometer stem. The instrument is then drawn to the surface and the recorded temperature, which remains unchanged until the instrument is reset, can then be read.

n: the part of a measuring device that is responsive to the absolute value or change in a physical quantity, such as temperature, pressure flow rate, pH, light, or sound. It converts that change into an input signal for an information-gathering system.

n: a device consisting of a sensing element. a power device, and an amplifier that is used to automatically control a mechanical device. The power device is usually called a servomotor.

n: the detecting element of a surface sensing automatic tank gauge.

n: a sensing element and its housing, if any, and defined as the part of a temperature device that is positioned in a liquid the temperature of which is being measured.