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02/2019 - MA OPTIWAVE-M 7400 C R01 en
6
APPENDIX
OPTIWAVE-M 7400 C
6.1
Glossary
D
Dielectric constant
An electrical property of the product. Also known as
ε
r, DK and relative
permittivity. This property defines the strength of the wave reflected back to the
device's signal converter.
Distance
The distance from the face of flange to the level (1 product) or the surface of the
top product (2 or more products). See the diagrams at the end of this section.
Drop antenna
A new generation of antenna made of PTFE or PEEK. It has an ellipsoidal
shape for a more precise emission of radar signals.
DTM
Device Type Manager. A driver for use in the PACTware
™
program. All data and
functions of the device are included in it.
E
Electromagnetic compatibility
(EMC)
Defines how much a device influences or is influenced by other devices that generate
electromagnetic fields during operation. Refer to European standard EN 61326-1 for
further details.
F
FMCW
Frequency-modulated continuous-wave radar technology. The signal is
continuously present, but the frequency is modulated, usually in successive
linear ramps over time (frequency sweeps).
H
Hazardous area
An area with a potentially explosive atmosphere. Trained personnel can
install and use a device in this area. The device must be ordered with the appropriate
options. The device requires approvals (ATEX, IECEx, cQPSus, NEPSI etc.) related to site
specifications. You can find more data about hazardous areas in the Ex Manuals and Ex
Certificates of Compliance.
Horn (cone) antenna
A common antenna for most applications. It is used for the controlled
emission and collection of radar signals.
I
Interference signals
False radar reflections usually caused by equipment in the tank.
L
Level
Height from the bottom of the tank (user-defined) to the surface of the top
product (Tank height
–
distance). See the diagrams at the end of this section.
M
Mass
Total mass of tank contents.