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Operating Instructions
4
Installation
4.1
Positioning the transducers
The flowmeter requires an even and uniform flow profile, since distortions in the flow can cause
unpredictable measurement errors.
In many applications, however, it is not possible to have a uniform flow rate through 360°. This may be, for example, because there
are air bubbles inside the top of the pipe, or turbulence in the pipe, or sludge at the bottom of the pipe.
Possible air gap
Possible deposits
(sludge)
5x inner diameter
Experience has shown that the most accurate results are obtained if the guide rail of the
transducers is not mounted vertically to the pipe, but turned at an angle of about 45° to the right
or left on the pipe.
NOTICE
Incorrect measurements
Measurements can be distorted if the transducers are positioned close to upstream pipe components and fittings such as pipe
bends, T-branches, valves, pumps and similar obstacles.
To ensure that the flowmeter is positioned at a place that has an undistorted flow profile, the transducers must be mounted
sufficiently far from possible sources of distortion to prevent these from having any effect on the measurement.
► Install a straight section of pipe with length 10 times the diameter on the upstream side of the transducer.
► Install a pipe section with length 5 times the diameter on the downstream side of the transducer. In exceptional cases, a pipe
with length 5 times the diameter may be sufficient.
Turbulent flow profile
Possible sensor position
Laminar flow profile
10x inner diameter
Installation
Flow
19
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