60
58-610 Model R82 Radar Transmitter
Accuracy
The closeness of agreement between the result of
measurement and the true value of the measure (inaccuracy
equals the maximum positive and negative % deviation over the
total span).
ANSI
American National Standards Institute.
Antenna
A mechanical component that serves as an impedance
match between the transmission of a signal in a cable (or wave-
guide) and air.
AntnaMnt
Antenna Mount
The type of process mounting
(NPT, BSP or Flange) utilized in the installation. This aids in
establishing an exact Sensor Reference Point for Radar propaga-
tion and measurement.
AntnaTyp
Antenna Type
A particular antenna configuration or
design. Each antenna design has a set of unique performance
characteristics.
ATEX
ATmosphere EXplosive
European regulations governing the
use in hazardous areas.
BlockDist
Blocking Distance
The area near the antenna where
reflections cannot be measured effectively due to antenna ringing
and noise.
CE
Conformité Européene
Standards and performance criteria for
the new European Union.
CENELEC
Comité Européen de Normalisation Electrotechnique
European organization that sets standards for electrical equipment.
CSA
Canadian Standards Association
Canadian, third party
agency that qualifies the safety of electrical equipment.
Damping
Factor applied to smooth output variations due
to turbulence.
Default Screen
The main position of the menu structure that
displays the primary measurement values of STATUS, LEVEL,
ECHO STRENGTH, % OUTPUT, LOOP CURRENT,
LOCAL TAG. The transmitter returns to this position after
5 minutes of inactivity (except Screens 2-6).
Diagnostics
Three levels of error messages; Fault, Warning
and Information.
Dielectric Constant
(
ε
) The electrical permittivity of a material.
The units are farad/meter. Typical values: Hydrocarbons 1.9–3,
Glycol 32, Water-based media 80. See Technical Handbook
41-600 for complete listing.
Dielectric Rod antenna
A non-metallic (TFE and polypropylene
typical) transition between the microwave waveguide and air.
Distance
The present reading measured from the transmitter’s
Sensor Reference Point to the material in a vessel; compliment
of Level.
DVM/DMM
Digital Volt Meter/Digital Multimeter.
Electromagnetic Energy
The radiation that travels through
space as electric and magnetic fields varying with position and
time. Examples in increasing frequency: radio waves, microwave,
infrared light, visible light, ultraviolet light, x-rays, gamma
waves, and cosmic waves.
EM
See Electromagnetic Energy.
EMI
Electromagnetic Interference
Electrical noise caused by elec-
tromagnetic fields that may affect electrical circuits, particularly
low-power electronic devices.
EN
European Normal
Committee guidelines in EC countries
that take precedence over local, country guidelines.
ENV
Preliminary EN guidelines, or pre-standards.
Ergonomic
A mechanism that considers human capability in its
design or function.
ETS
Equivalent Time Sampling
Process that captures high speed
electromagnetic events in real time (nanoseconds) and recon-
structs them into an equivalent time (milliseconds).
Explosion Proof Enclosure
An enclosure designed to withstand
an explosion of gas or vapor within it and prevent the explosion
from spreading outside the enclosure.
Factory Sealed
A third-party-approved Explosion Proof seal
installed in the unit during manufacturing. This alleviates the
end user from installing an external XP seal adjacent (within
18") to the device.
Fault
The highest level in the hierarchy of diagnostics annunci-
ating a defect or failure in circuitry or software that preclude reli-
able measurement. The current (mA) value unit defaults to 3.6,
22, or Hold and a message is displayed on the rotating screen.
Further information can be obtained by viewing the Status or
Diagnostic (Factory Menu) screens.
Feedthrough
A small, connecting cavity between the main hous-
ing compartments, carrying the cable that supplies the operating
energy to the measurement circuitry and returns the output
value proportional to level. This cavity is potted to maintain the
environmental isolation between the two compartments.
Fiducial
A reference signal (baseline) to which all measurements
are referenced.
FM
Factory Mutual
American, third party agency that qualifies
the safety of electrical equipment.
Foam
The entraining of air in a liquid. The effect of foam on
radar measurement is based on four factors; 1.) dielectric of the
liquid from which the foam has developed, 2.) density of the
foam (bubble size), 3.) amount of foam above the liquid and, to
a lesser extent, 4.) wall thickness of the bubbles.
Glossary
