Control and Instrumentation Glossary
We have 18 entries in our Glossary for this letter.
Arithmetic Average Roughness Height
Method of determining surface roughness.
Flange Surface Finish Guide
The measurement of pressure relative to the pressure in a vacuum.
It is equal to the sum of the pressure shown on a pressure gauge and atmospheric pressure.
The closeness of the agreement between the result of the measurement and the conventional true value of the quantity.
AF - Across the Flats
Measurement between 2 parallel faces on a nut. Indicates the size of spanner or socket required to tighten or loosen the nut.
AGA - American Gas Association
Promoters of gas use in the US and publishers of widely used calculations for gas density (AGA 8) and gas flow (AGA 3).
The atmospheric pressure surrounding a sensor or instrument.
The average temperature of the atmosphere surrounding an instrument.
Assumes that the instrument is not exposed to the sun or other radiant energy sources.
A signal that continuously represents a variable or condition.
Typical annalogue signal is 4 to 20 mA
Analogue to Digital Converter
An electronic device that converts analogue signals to an equivalent digital form.
A device that uses Pitot tubes to measure the gas flow rate within a pipeline.
ANSI - American National Standards Institute
A private non-profit organization that administers and coordinates the U.S. voluntary standardisation and conformity assessment system.
American Petroleum Institute
A trade association founded in 1919 sponsored by the oil and gas industry to develop Recommended Practices for the industry.
American Standard Code for Information Interchange established to achieve compatibility between various types of data processing equipment.
ASCII Code Guide
American Society of Mechanical Engineers.
Professional organisation focused on technical; educational and research issues of the engineering and technology community.
American Society for Testing and Materials.
EU Directive 94/9/EC covering equipment and protective systems for use in potentially explosive atmospheres.
A dimensionless ratio defining the decrease in magnitude of a signal as it passes between two points or two frequencies.
Occasionally expressed in decibels (dB).
AWG - American Wire Gauge
A standarised method for specifying the properties - including diameter - of electrical and electronic wire.
Electrical and Electronic Wire
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