Positioning The Transducers; Incorrect Measurements; Attaching The Transducers - GF U3000 V2 Betriebsanleitung

Installation
4.3

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.
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.
4.3.1

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.
4.4

Attaching the transducers

Type 'A' or 'B' transducers are attached to the pipe using the adjustable guide rail assembly shown below. The guide rail itself is
secured to the pipe using two wrap-around steel bands. For convenience, an imperial (inches) and metric (millimeters) ruler is
attached to the side plate of the guide rail. Once the guide rail assembly is fully assembled the transducers are locked into position
by tightening the transducer clamp.
NOTICE
When using the flowmeter in the 'diagonal' mode, or in 'reflex' mode on pipes over 350 mm diameter, two guide rails are required
with a transducer mounted in each one – refer to correct section (6.4.4. in this document).
4.4.1 Cleaning the contact area.
Type 'A' or 'B' transducers are attached to the pipe using the adjustable guide rail assembly shown in Figure below. The guide rail
itself is secured to the pipe using two wrap-around steel bands. For convenience, an imperial (inches) and metric (millimetres)
ruler is attached to the side plate of the guide rail. Once the guide rail assembly is fully assembled the transducers are locked into
position by tightening the transducer clamp.
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User Manual