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Control and Instrumentation GlossaryWe have 20 entries in our Glossary for this letter. C&E Cause and Effect Typically used to refer to a chart depicting the functions required from a logic system, e.g. PLC, ESD etc Further Reading Calibration The process of adjusting an instrument so that its reading can be correlated to the actual values being measured. Further Reading Capaciatance The capability of a device to store electric charge. The unit is the farad, which expresses the ratio of stored charge in coulombs to the impressed potential difference in volts. Further Reading Cavitation A condition of liquid flow where a liquid vaporises and the vapour bubbles subsequently collapse. Can produce surface damage to pumps; valves etc. Further Reading CCC - Compressor Controls Corporation US based manufacturer of antisurge devices for centrifugal compressors. Further Reading CCR Central Control Room Further Reading CEN - Committee European de Normalisation One of the European Standards Bodies that produces harmonised standards in all fields except electrotechnical and telecoms. Further Reading CENELEC European Committee for Electrotechnical Standardisation Further Reading Centigrade A non-preferred term formerly used to designate the scale now referred to as the Celsius scale. Further Reading CESI Testing institute and Notified Body based in Italy. Also provide power system studies and consultancy to power producers; electrical utilities; large-scale users of electricity and Financial Institutions. Further Reading Chatter Rapid abnormal and detremental opening and closing of a valve Most often associated with relief valves Further Reading Coaxial Cable Cable consisting of a central wire surrounded by an electrical insulator which in turn is surrounded by a shield conductor Provides a low capacitance and inductance cable most suited to carry high frequency current Further Reading COD - Chemical Oxygen Demand The quantity of oxygen used in biological and non-biological oxidation of materials in water. Used as a measure of water quality. Further Reading BiologicaL Oxygen Demand Compensating Cable Cable whose wires are constructed from low cost alloy conductors with thermo-electric properties similar though different to those of the thermocouple to which it will be connected. The operating temperature range in which the cable operates has to be restricted to minimise errors. Further Reading COSHH UK regulations set up in 1994 for Control of Substances Hazardous to Health. Revised in 2002 Further Reading CPU Central Processing Unit Further Reading CRA Corrosion Resistant Alloy Further Reading CRO Control Room Operator Sometimes referred to as Control Room Technician (CRT) Further Reading CSA Canadian Standards Association Publishes standards for equipment requirements Further Reading CV - valve flow coefficient A measurement of valve capacity. The number of gallons per minute of room temperature water that will flow through the valve with a pressure drop of 1 psi across the valve. Further Reading |
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