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March 2024
1
Location and orientation
Correct orientation and straight run requirements must be met for
accurate and repeatable flow measurements. Refer to
minimum pipe diameter distances from upstream disturbances.
Note
•
Consult the factory for instructions regarding use in square or
rectangular ducts.
•
"In plane A" means the sensor is in the same plane as the elbow.
"Out of plane A" means the bar is perpendicular to the plane of
the elbow.
•
If proper lengths of straight run are not available, position the
mounting such that 80% of the run is upstream and 20% is
downstream.
•
Use straightening vanes to reduce the required straight run
length.
•
Row 6 in
throttling valves that are partially opened, as well as control
valves.
Table 1-1: Straight Run Requirements
In plane
Out of plane
1
2
Quick Start Guide
Table 1-1
applies to gate, globe, plug, and other
Upstream pipe diameters
Without
straightening
vanes
In
plane A
8
N/A
11
With
straightening
vanes
Out of
A'
C
plane A
10
N/A N/A
N/A
8
4
16
N/A
N/A
Quick Start Guide
Table 1-1
for
Downstream
pipe
diameters
C'
B
N/A
4
4
4
N/A
4
3
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