Manual
34
used for the circuit [see 4/20]
dB . . . . . . . . . . . . . . . . . . . . . see - decibel
DB25. . . . . . . . . . . . . . . . . . . a style and size of connector - in this case with 25 pins
DB9. . . . . . . . . . . . . . . . . . . . a style and size of connector - in this case with 9 pins
decibel. . . . . . . . . . . . . . . . . . a dimensionless unit representing the logarithm of the ratio of two
values
DEMKO . . . . . . . . . . . . . . . . independent test laboratory and the European National Certification
Body for Denmark for the safety testing of electrical products
desiccant . . . . . . . . . . . . . . . . drying agent, usually made from molecular sieve, silica gel or acti-
vated alumina
desorption . . . . . . . . . . . . . . . release of a previously absorbed or adsorbed substance
dewpoint . . . . . . . . . . . . . . . . saturation temperature of a gas in regards to another gas
dewpoint demand mode . . . . scheme to control the switching between the desiccant towers of a
dryer based on the actual dewpoint
dielectric constant . . . . . . . . . measure of the ability of a material to hold an electric charge when
placed between two metal plates, most commonly measured rela-
tive to that of free space
Div 2 . . . . . . . . . . . . . . . . . . . see Division 2 Hazardous Areas
Division 2
Hazardous Areas . . . . . . . areas classified as hazardous under abnormal conditions (0.1-10
hrs/year)
DSR. . . . . . . . . . . . . . . . . . . . Data Set Ready - a label for a RS232 interface control line
DTR . . . . . . . . . . . . . . . . . . . Data Terminal Ready - a label for a RS232 control line
EEPROM . . . . . . . . . . . . . . . Electrically Erasable Programmable Read Only Memory - a device
that can remember information, even when it has no power applied
to it
electromagnetic
compatibility . . . . . . . . . . compatibility with directives issued under CE or with FCC stan-
dards, concerning electromagnetic interference
EMI . . . . . . . . . . . . . . . . . . . . Electro-Magnetic Interference - external electrical or magnetic sig-
nals from natural or man-made sources that can interfere with a
device
G/M
3
. . . . . . . . . . . . . . . . . . . see - grams per cubic meter
grams per cubic meter. . . . . . the mass of water vapor present in unit volume of moist air at stan-
dard temperature and pressure.
HTF™ . . . . . . . . . . . . . . . . . Hyper-Thin-Film aluminum oxide sensor technology.
hygrometer . . . . . . . . . . . . . . device measuring the amount of water present in a sample
hygroscopic. . . . . . . . . . . . . . property of attracting water or water vapor
hysteresis. . . . . . . . . . . . . . . . lagging in effect behind it’s cause depending upon whether the con-
dition is approached from above or below the value of interest; pur-
posefully programmed into control systems with relays to avoid
chatter
IGT Research Bulletin 8 . . . . Institute of Gas Technology, has developed Charts of the Equilib-
rium Moisture Content of Natural Gases in the Range of -40°F to
250°F and 14.7 to 5000 psi
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