ABB AquaProbe FEA100 User Manual page 28

AquaProbe FEA100 / FEA200
Electromagnetic flowmeter – insertion-type flow sensors
Limits of Upstream Disturbance
Type of Disturbance Upstream from
the Measuring Cross-Section
90° Elbow or a T-bend
Several 90° Coplanar Bends
Several 90° Non-coplanar Bends
Total Angle Convergent 18 to 36°
Total Angle Divergent 14 to 28°
Fully Opened Butterfly Valve
Fully Opened Plug Valve
*Expressed in multiples of the diameter of the conduit.
Downstream from the measurement cross-section, the straight length must be at least equal to five duct diameters whatever the type of
disturbance.
Note. This Table is an extract from ISO7145 (BS 1042): Section 2.2: 1982 and is reproduced with the permission of BSI.
Complete copies of the standard can be obtained by post from BSI Publications, Linford Wood, Milton Keynes, MK14
6LE.
26
On
Centre Line
Minimum Upstream Straight Length*
For a measurement at the point of
mean axial velocity
50
50
80
30
55
45
30
5 See
Diameters Table Below
For a measurement on the
axis of the conduit
25
25
50
10
25
25
15
OI/FEA100/200–EN Rev. D
6 Specification