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Glossary of terms used on this site

There are 823 entries in this glossary.
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Term Definition
I/O port

A channel through which data is transferred between an input or output device and the microprocessor. The port appears to the CPU as one or more memory addresses that it can use to send or receive data.

I/P

Shorthand for current-to-pressure (I-to-P). Typically applied to input transducer modules.

Icon

A graphic functional symbol display. A graphic representation of a function or functions to be performed by the computer.

ICP

Integrated Circuit Piezoelectric; term sometimes used to describe an accelerometer with built-in electronics.

IEEE (Institute of Electrical and Electr

An organization of engineering and electronics professionals notable for developing the IEEE 802 standards for the physical and data-link layers of local area networks following the ISO Open Systems Interconnection model.

Impedance

The total opposition to electrical flow, including both resistive and reactive elements.

Infrared

An area in the electromagnetic spectrum extending beyond red light from 760 nanometers to 1000 microns (106 nm). It is the form of radiation used for making non-contact temperature measurements.

Inherent Characteristic

The relationship between the flow coefficient and the closure member (disk) travel as it is moved from the closed position to rated travel with constant pressure drop across the valve. Typically these characteristics are plotted on a curve where the horizontal axis is labeled in percent travel and the vertical axis is labeled as percent flow (or Cv). Because valve flow is a function of both the valve travel and the pressure drop across the valve, conducting flow characteristic tests at a constant pressure drop provides a systematic way of comparing one valve characteristic design to another. Typical valve characteristics conducted in this manner are named Linear, Equal-Percentage, and Quick Opening.

Inherent Diaphragm Pressure Range

(Control Valve Functions and Characteristics Terminology) The high and low values of pressure applied to the diaphragm to produce rated valve plug travel with atmospheric pressure in the valve body. This range is often referred to as a bench set range because it will be the range over which the valve will stroke when it is set on the work bench.

Inherent Flow Characteristic

(Control Valve Functions and Characteristics Terminology) The relationship between the flow rate and the closure member travel as it is moved from the closed position to rated travel with constant pressure drop across the valve.

Initial Unbalance

Initial unbalance is that unbalance of any kind that exists in the rotor before balancing.

Input Impedance

The resistance measured across the excitation terminals of a transducer.

Input Impedance (Input Resistance)

DC (or AC) resistance measured across the input terminals with signal leads disconnected.

Input Resistance (Impedance)

The input resistance of a pH meter is the resistance between the glass electrode terminal and the reference electrode terminal. The potential of a pH-measuring electrode chain is always subject to a voltage division between the total electrode resistance and the input resistance.

Installed Characteristic

The relationship between the flow rate and the closure member (disk) travel as it is moved from the closed position to rated travel as the pressure drop across the valve is influenced by the varying process conditions.

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