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Omega Model CYTX231 User’s Manual
B-2 Glossary
of
Terminology
error
. Any discrepancy between a computed, observed, or measured quantity and the
true, specified, or theoretically correct value or condition.
2
excitation
. Either an AC or DC input to a sensor used to produce an output signal.
Common excitations include: constant current, constant voltage, or constant power.
Fahrenheit (°F) Scale
. A temperature scale that registers the freezing point of water
as 32 °F and the boiling point as 212 °F under normal atmospheric pressure.
See
Temperature for conversions.
four-lead
. measurement technique where one pair of excitation leads and an
independent pair of measurement leads are used to measure a sensor. This
method reduces the effect of lead resistance on the measurement.
GaAlAs
. Gallium-aluminum-arsenide semiconducting material used to make the
special Omega TG family of diode temperature sensors.
gaussian system (units)
. A system in which centimeter-gram-second units are used
for electric and magnetic qualities.
ground
. A conducting connection, whether intentional or accidental, by which an
electric circuit or equipment is connected to the earth, or to some conducting body
of relatively large extent that serves in place of the earth.
Note:
It is used for
establishing and maintaining the potential of the earth (or of the conducting body) or
approximately that potential, on conductors connected to it, and for conducting
ground current to and from the earth (or of the conducting body).
2
hazard communication standard (HCS)
. The OSHA standard cited in 29 CFR
1910.1200 requiring communication of risks from hazardous substances to workers
in regulated facilities.
hertz (Hz)
. A unit of frequency equal to one cycle per second.
international system of units (SI)
. A universal coherent system of units in which the
following seven units are considered basic: meter, kilogram, second, ampere,
kelvin, mole, and candela. The International System of Units, or Système
International d'Unités (SI), was promulgated in 1960 by the Eleventh General
Conference on Weights and Measures. For definition, spelling, and protocols,
see
Reference 3 for a short, convenient guide.
interpolation table
. A table listing the output and sensitivity of a sensor at regular or
defined points which may be different from the points at which calibration data was
taken.
IPTS-68
. International Practical Temperature Scale of 1968. Also abbreviated as
T
68
.
isolated
(neutral system). A system that has no intentional connection to ground
except through indicating, measuring, or protective devices of very-high
impedance.
2
ITS-90.
International Temperature Scale of 1990. Also abbreviated as
T
90
. This scale
was designed to bring into as close a coincidence with thermodynamic
temperatures as the best estimates in 1989 allowed.
Kelvin (K)
. The unit of temperature on the Kelvin Scale. It is one of the base units
of SI. The word “degree” and its symbol (°) are omitted from this unit.
See
Temperature Scale for conversions.
Kelvin Scale
. The Kelvin Thermodynamic Temperature Scale is the basis for all
international scales, including the ITS-90. It is fixed at two points: the absolute zero
of temperature (0 K), and the triple point of water (273.16 K), the equilibrium
temperature that pure water reaches in the presence of ice and its own vapor.
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