Teledyne 8800A Operating Instructions Manual page 42

impedance . . . . . . . . . . . . . . . the ratio of voltage to current at a specified frequency measured in
in-situ . . . . . . . . . . . . . . . . . . measurement with sensor located in the process stream
intrinsically safe . . . . . . . . . . incapable of releasing enough electrical or thermal energy to cause
LBS H O/mmscf. . . . . . . . . . see - pounds of water per million standard cubic feet
2
LCD . . . . . . . . . . . . . . . . . . . Liquid Crystal Display - a display that uses a special material [that
monograph . . . . . . . . . . . . . . a systematic learned exposition of a subject, e.g. a chart represent-
National Electrical Code . . . . a set of US standards related to accepted practices for electrical wir-
NFPA. . . . . . . . . . . . . . . . . . . National Fire Protection Agency (issuer of the National Electrical
NIST . . . . . . . . . . . . . . . . . . . National Institute of Standards and Technology
NPT . . . . . . . . . . . . . . . . . . . . National (American Standard) Pipe Taper; an ASTM (American
parity . . . . . . . . . . . . . . . . . . . a way of incorporating error checking into a RS232 data transmis-
pounds of water per
million standard cubic feet . (LBS H
ppm . . . . . . . . . . . . . . . . . . . . parts per million - usually based on volume measure, but must be
ppmV . . . . . . . . . . . . . . . . . . parts per million based on volume measure, volume of water vapor
pressure correction . . . . . . . . computation of dewpoint at a pressure different from the pressure at
PROM . . . . . . . . . . . . . . . . . . Programmable Read Only Memory - a device that can be pro-
RAM . . . . . . . . . . . . . . . . . . . Random Access Memory - a device that holds data as long as it has
regenerative dryer purge . . . . small flow of dry air from drying column passing through regener-
response time . . . . . . . . . . . . time it takes for a sensor to react to change in its environment
RG58 . . . . . . . . . . . . . . . . . . . a type of coaxial cable - the letters/numbers refer to the electrical
Ohms, a resistor of the same value would act the same as the mea-
sured circuit
the ignition of flammable substances listed for a hazardous area
classification
is sensitive to electrical voltages] to affect the transmission or
reflection of light
ing dewpoint conversions for differing pressures.
ing
Code (NEC))
Society for Testing and Materials) standard of tube fittings with
tapered threads
sion [on a character by character basis] to check if the data has been
received correctly
O/mmscf) the mass of water vapor present in unit volume
2
of moist air at standard temperature and pressure.
a measurement unit for moisture, typically used in the natural gas
industry
stated whether it is by volume or by mass (weight)
per total volume of gas for an ideal gas.
the sensor
grammed so that data is permanently stored in it [typically used for
computer programs]
power applied to it [the data can be changed with out limit]
ating column and desorbing water from desiccant at low pressure
characteristic of the cable [resistance/capacitance per foot of
length]
35
Glossary