Vega VEGAPULS 61 (≥ 2.0.0 - ≥ 4.0.0) Profibus PA Bedienungsanleitung PDF herunterladen (Seite 25)

4 Mounting

VEGAPULS 61 • Probus PA

36501-EN-121011

•

The measurement through a ball valve with complete run is pos-

sible

Constructional requirements on the bypass pipe:

•

Material metal, smoother inner tube

•

In case of an extremely rough tube inner surface, use an inserted

tube (tube in tube) or a radar sensor with tube antenna

•

Flanges are welded to the tube according to the orientation of the

polarisation level

•

Gap size with junctions ≤ 0.1 mm, for example, when using a ball

valve or intermediate anges with single pipe sections

•

The antenna diameter of the sensor should correspond to the

inner diameter of the tube

•

Diameter should be constant over the complete length

The short examples give you introductory information on the ow

measurement. Detailed planning information is available from ume

manufacturers and in special literature.

max

min

≥ 2 mm x h

max

90°

3 ... 4 h

max

≥ 50 mm

90°

2 3

Fig.22:Flowmeasurementwithrectangularume:d

min.

= min. distance of the

sensor (see chapter "Technical data"); h

max.

=max.llingoftherectangular

ume

1 Overoworice(sideview)

2 Headwater

3 Tail water

4 Overfallorice(viewfrombottomwater)

In general, the following points must be observed:

•

Install the sensor on the headwater side

•

Installation in the centre of the ume and vertical to the liquid

surface

•

Distance to the overfall orice

•

Distance of orice opening above ground

•

Min. distance of the orice opening to bottom water

•

Min. distance of the sensor to max. storage level

Flow measurement with

rectangularume

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 87 88

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