Glossary

Glossary

0/24 mA . . . . . . . . . . . . . . . . range of current for the current loop (0mA=minimum reading, 24mA=maximum reading)

4/20 mA . . . . . . . . . . . . . . . . range of current for the current loop (4mA=minimum reading, 20mA=maximum reading) - preferred because less than 4mA can indicate a fault or open circuit, also there is at least 4mA available to power equipment

7 segment . . . . . . . . . . . . . . . type of display configuration - where 7 segments can be used to form the numbers 0 through 9 and most letters

A/D . . . . . . . . . . . . . . . . . . . . analog to digital - a device or circuit that converts an analog voltage to a digital number

absorption . . . . . . . . . . . . . . . retention by penetration into bulk of material adsorption . . . . . . . . . . . . . . . retention as a surface layer on a material

accuracy . . . . . . . . . . . . . . . . quantification of the magnitude of error of a measurement, or degree of conformity with a standard.

Al2O3 . . . . . . . . . . . . . . . . . . aluminum oxide

attenuation

the decrease in intensity of a signal, as a result of absorption of

 

energy, measured in decibels (dB).

AWG

American Wire Gauge (size of the wire, cross section area of the

 

wire)

baud

Bits per second of data transfer (over the serial interface)

bit(s)

Binary digit(s) - ones and zeros

BNC

a connector type, used with coaxial cables

bypass mounting

sensor mounting in a slip stream of sample, which feeds back into

 

the process stream

CE

Conformitée Europeane; symbol affixed to a product indicating its

 

conformance with directives issued by the European Community

 

(EC)

CENELEC

Comité Europeen de Normalisation Electrotechnique (European

 

Committee for Electrotechnical Standardization); amongst many

 

others has set standards for intrinsic safety

check sum

an arithmetic total on a set of data: e.g. the data in the instrument's

 

memory is summed, and compared to a previously stored sum to

 

check for corrupted data

coalescing

formation of liquids in gas samples, or separation and collection for

 

disposal of liquids from gas samples

control drawing

schematics and system drawing of hazardous area approved appara-

 

tus with control number issued by approval agency

CSA

Canadian Standards Association

CTS

Clear To Send - a label for a RS232 interface control line

cUL

indicates UL evaluation of a product to Canadian safety require-

 

ments

current loop

a circuit where the variation in the current flow is used to indicate

 

the value of a measurement from the instrument, only 2 wires are

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Epson XDT manual Glossary