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BM 70 X Project Engineering Guidelines 01/2001
2.2 Signal processing
(digital)
The radar signals are further processed digitally by a microprocessor. The processing system is distin-
guished by intelligent procedures taking into consideration plausibilities and history.
2.3 Advantages of radar technology
Compared to alternative level gauging methods, radar technology offers numerous advantages:
•
Non-contact measurement
•
It is independent of the gas composition and temperature of the tank atmosphere
•
Will also work in tank atmospheres containing vapour and dust
•
Independent of electrical properties of the product (conductivity, permittivity)
•
Independent of product density and pressure
•
No radiation hazard
•
Extremely high measuring accuracy (version BM 70 P)
2.4 Modularity
(signal converter, flange, antenna)
The measuring system consists of the flange system und the signal converter.
The flange system contains the microwave window separating product from pressure, and the antenna
system.
The compact signal converter contains the microwave generator and the entire signal processing
system, including provision of a standardized output signal (4-20 mA or digital interface).
The signal converter can be detached from the flange system under process conditions, without loss
of pressure or escape of product.
Converter
Flan
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