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Glossary ...C

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

Cavitation: The boiling of a liquid caused by a decrease in pressure rather than an increase in temperature.

CE Approval: CE marking is a declaration by the manufacturer that the product meets all the appropriate provisions of the relevant legislation implementing certain European Directives. The initials "CE" do not stand for any specific words but are a declaration by the manufacturer that his product meets the requirements of the applicable European Directive(s). Portaflow 330, 220A, 220B models manufactured in accordance with the following Directives and Standards: Directive 2004/108/EC, Directive 2006/95/EC. BS EN 610101:2001, BS EN61326-1:2006, BS EN613626-2:2006.

Centre of Gravity (mass centre): The centre of gravity of a body is that point in the body through which passes the resultant of weights of its component particles for all orientations of the body with respect to a uniform gravitational field.

CFM: The volumetric flow rate of a liquid or gas in cubic feet per minute.

Closeness of Control: Total temperature variation from a desired set point of system. Expressed as "closeness of control" is ±2° C or a system bandwidth with 4° C, also referred to as amplitude of deviation.

Colour Code: The ANSI established colour code for thermocouple wires in the negative lead is always red. Colour Code for base metal thermocouples is yellow for Type K, black for Type J, purple for Type E and blue for Type T.

Communication: Transmission and reception of data among data processing equipment and related peripherals.

Compensated Connector: A connector made of thermocouple alloys used to connect thermocouple probes and wires. Compensation: addition of specific materials or devices to counteract a known error.

Confidence Level: The range (with a specified value of uncertainty, usually expressed in percent) within which the true value of a measured quantity exists.

Connection Head: An enclosure attached to the end of a thermocouple which can be cast iron, aluminium or plastic within which the electrical connections are made.

Convection: 1. The circulatory motion that occurs in a fluid at a nonuniform temperature owing to the variation of its density and the action of gravity. 2. The transfer of heat by this automatic circulation of fluid.

CPS: Cycles per second; the rate or number of periodic events in one second, expressed in Hertz (Hz).

Critical Damping: Critical damping is the smallest amount of damping at which a given system is able to respond to a step function without overshoot.

Critical Speed: The rotational speed of the rotor or rotating element at which resonance occurs in the system.

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