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Control and Instrumentation Glossary

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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
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Calibration
The process of adjusting an instrument so that its reading can be correlated to the actual values being measured.

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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.
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Cavitation
A condition of liquid flow where a liquid vaporises and the vapour bubbles subsequently collapse.
Can produce surface damage to pumps; valves etc.
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CCC - Compressor Controls Corporation
US based manufacturer of antisurge devices for centrifugal compressors.

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CCR
Central Control Room

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CEN - Committee European de Normalisation
One of the European Standards Bodies that produces harmonised standards in all fields except electrotechnical and telecoms.

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CENELEC
European Committee for Electrotechnical Standardisation

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Centigrade
A non-preferred term formerly used to designate the scale now referred to as the Celsius scale.

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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.
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Chatter
Rapid abnormal and detremental opening and closing of a valve
Most often associated with relief valves
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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
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CPU
Central Processing Unit

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CRA
Corrosion Resistant Alloy

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CRO
Control Room Operator
Sometimes referred to as Control Room Technician (CRT)
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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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ATEX
Cable Gland Selector
CE Marking
Flange Dimensions
Ingress Protection
Pipe Schedules
Relief Valve Orifice Size
Temperature Class
Temperature Conversion
Thermocouple Types
Valve Leakage
Vortex Meters
Wires and Cables

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