18
BM 70 M
B) Solid antenna
6.1.4 Mounting on stilling wells/ trunks
Antenna Type
Outside diameter
1s
76 mm (2.99”)
2s
100 mm (3.94”)
3
140 mm (5.51”)
3s
152 mm (5.98”)
4s
200 mm (7.87”)
If necessary, turn antenna to size!
Further requirements on stilling wells:
•
The well must be electrically conductive.
•
Minimum inside diameter of well: 40 mm (1.57"). (BM 70 M: 80 mm, better > 100 mm).
•
If possible, use only smooth walled, straight stilling wells. If nevertheless an assembled stilling
well is necessary, abrupt changes in diameter along the pipe should be less than 1 mm
(0.04"). Surface roughness of the inside of the pipe should not be more than + 0.1 mm
(0.004").
•
For the BM 70 M the antenna types 1s, 2s, 3s or 4s have to be used to achieve a high
measuring accuracy.
It is possible to measure through a full-bore open ball valve if the valve and the pipe adapters
above and below the valve are relatively smooth-walled.
It is not possible to measure levels below the end of the stilling well.
To ensure equalization of pressure, drill one or two small holes in the stilling well above the
maximum filling level.
800 mm
Summary of Contents for BM 70 M Series
Page 75: ...BM 70 M 75 10 Certificates and approvals 10 1 Declaration of Conformity...
Page 83: ...BM 70 M 83 Annex C Spare parts...
Page 84: ...84 BM 70 M...
Page 85: ...BM 70 M 85...
Page 102: ...16 BM 70M EEx BM 70Mi EEx 11 Approvals...
Page 103: ...BM 70M EEx BM 70Mi EEx 17...
Page 104: ...18 BM 70M EEx BM 70Mi EEx...
Page 105: ...BM 70M EEx BM 70Mi EEx 19...
Page 106: ...20 BM 70M EEx BM 70Mi EEx...
Page 107: ...BM 70M EEx BM 70Mi EEx 21...
Page 108: ...22 BM 70M EEx BM 70Mi EEx...
