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BM 70 X Project Engineering Guidelines 01/2001
1 Application range
The BM 70 A/P, BM 702 Level-Radar gauging system is used for distance, level, volume and reflection
measurement of liquids, pastes, slurries, solids and particulate materials. It can be operated on
storage and process tanks, and also on still wells.
BM 70 P is specially designed for applications on storage tanks with highest precision requirements.
BM 702 is a 2-wire Radar for the simpler applications in storage tanks, process tanks, stilling wells and
side vessels.
Hazardous-duty versions BM 70 A/P, BM 702 Ex are suitable for use in Ex-Zone 0, 1 and 2.
In Germany (and, depending on the respective radio approval, in some other countries as well), its use
is restricted to closed tanks or containers made of metal or concrete. Because of low output, however,
the microwaves are not harmful to humans.
Selection sheet
Application condition BM 702 BM 70 A BM 70 P
Measuring range ≤ 20 m / 66 ft
99 9
Measuring range 20 ... 35 m / 66 ... 115 ft —
99
Measuring range 35 ... 100 m / 115 ... 328 ft — K —
Storage tanks
99 9
Still wells / reference vessels
99 9
Process tanks with slightly moving surface
99
K
Difficult process tanks (e.g. agitator) —
9
—
Large or many disturbing tank internals —
9
K
Solids — K —
Extreme measuring accuracy (± 1 mm) — —
9
High measuring stability / repeatability — —
9
Current output 4-20 mA HART®
99 9
2-wire connection
9
——
Bus connection (RS 485, PROFIBUS-PA, FF) K
99
Legend:
9 suitable
— not suitable
K contact KROHNE
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