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Omega Model CYTX231 User’s Manual
Glossary of Terminology B-1
APPENDIX B
GLOSSARY OF TERMINOLOGY
absolute zero . The temperature of –273.15 °C, or –459.67 °F, or 0 K, thought to be
the temperature at which molecular motion vanishes and a body would have no
heat energy.
1
accuracy . The degree of correctness with which a measured value agrees with the
true value.
2
electronic accuracy . The accuracy of an instrument independent of the sensor.
sensor accuracy . The accuracy of a temperature sensor and its associated
calibration or its ability to match a standard curve.
ambient temperature . The temperature of the surrounding medium, such as gas or
liquid, which comes into contact with the apparatus.
1
anode . The terminal that is positive with respect to the other terminal when the diode
is biased in the forward direction.
2
Anode Cathode
+ –
asphyxiant gas . A gas which has little or no positive toxic effect but which can bring
about unconsciousness and death by displacing air and thus depriving an organism
of oxygen.
calibration . To determine, by measurement or comparison with a standard, the
correct (accurate) value of each scale reading on a meter or other device, or the
correct value for each setting of a control knob.
1
cathode . The terminal from which forward current flows to the external circuit.
2
Anode Cathode
+ –
Celsius (°C) Scale . A temperature scale that registers the freezing point of water as
0 °C and the boiling point as 100 °C under normal atmospheric pressure. Celsius
degrees are purely derived units, calculated from the Kelvin Thermodynamic Scale.
Formerly known as “centigrade.”
See Temperature for conversions.
cgs system of units . A system in which the basic units are the centimeter, gram, and
second.
2
cryogenic . Refers to the field of low temperatures, usually –130 °F or below, as
defined by 173.300(f) of Title 49 of the Code of Federal Regulations.
cryogenic fluid . A liquid that boils at temperatures of less than about 110 K at
atmospheric pressure, such as hydrogen, helium, nitrogen, oxygen, air, or methane.
Also known as cryogen.
1
cryostat . An apparatus used to provide low-temperature environments in which
operations may be carried out under controlled conditions.
1
curve . A set of data that defines the temperature response of a temperature sensor. It
is used to convert the sensor's signal to temperature.
Curve 10 . The voltage versus temperature characteristic followed by all CY-7 Series
Silicon Diode Temperature Sensors.
degree . An incremental value in the temperature scale, i.e., there are 100 degrees
between the ice point and the boiling point of water in the Celsius scale and
180 degrees between the same two points in the Fahrenheit scale.
drift, instrument . An undesired but relatively slow change in output over a period of
time, with a fixed reference input. Note: Drift is usually expressed in percent of the
maximum rated value of the variable being measured.
2