COSA Xentaur Xentaur XDT - Manual (Page 38)

Glossary
31
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.
Al
2
O
3
. . . . . . . . . . . . . . . . . . aluminum oxide
ATEX . . . . . . . . . . . . . . . . . . (ATmospheres EXplosibles) directive defines the requirements
upon equipment to be installed in Hazardous Locations. Only prod-
ucts with the ATEX certification and with ATEX labeling are
approved for placing into service in Hazardous Locations in the EU
(European Union) and EFTA (European Free Trade Association)
countries.
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).
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