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Chapter 2 Installation Series 220/221 Instruction Manual
Unobstructed Flow Requirements
Select an installation site that will minimize possible distortion in the flow
profile. Valves, elbows, control valves and other piping components may
cause flow disturbances. Check your specific piping condition against the ex-
amples shown below. In order to achieve accurate and repeatable perform-
ance install the flow meter using the recommended number of straight run
pipe diameters upstream and downstream of the sensor.
Note: For liquid applications in vertical pipes, avoid installing with flow in
the downward direction because the pipe may not be full at all points.
Choose to install the meter with flow in the upward direction if possible.
Flow meter
AB
Example 1.
One 90° elbow before meter
C'
Flow meter
AB
C
Flow conditioner
(if used)
Example 2.
Two 90° elbows before meter in one plane
C'
Flow meter
AB
C
Flow conditioner
(if used)
Example 3.
Two 90° elbows before meter out of plane (if three
90° bends present, double recommended length)
Flow meter
AB
Example 4.
Reduction before meter
C' C
Flow conditioner
(if used)
Flow meter
AB
C' C
Flow conditioner
(if used)
Example 5.
Expansion before meter
Example 6.
Regulator or valve partially closed before meter
(If valve is always wide open, base length
requirements on fitting directly preceding it)
Flow meter
AB
C' C
Flow conditioner (if used)
Minimum Required
Upstream Diameters
Minimum Required
Downstream Diameters
No Flow
Conditioner
With Flow Conditioner
No Flow
Conditioner
With Flow
Conditioner
Example A A C C´ B B
1 10 D N/A N/A N/A 5 D 5 D
2 15 D 10 D 5 D 5 D 5 D 5 D
3 25 D 10 D 5 D 5 D 10 D 5 D
4 10 D 10 D 5 D 5 D 5 D 5 D
5 20 D 10 D 5 D 5 D 5 D 5 D
6 25 D 10 D 5 D 5 D 10 D 5 D
D = Internal diameter of channel. N/A = Not applicable
Figure 2-1. Recommended Pipe Length Requirements for Installation, Series 220 and 221
2-2 IM-22