Vega VEGAPULS 43 Profibus PA Bedienungsanleitung PDF herunterladen (Seite 19)

VEGAPULS 43 – Profibus PA 19

Welding beads too large

Tube connection protrudes

Additional connection in the bypass tube in one plane

Use of guide tubes

In case of very rough inner surfaces in exist-

ing bypass tubes (e.g. due to corrosion),

large connecting tube openings, as well as

bypass tubes with more than 100 mm inner

diameter, the use of a guide tube inside the

existing bypass tube is recommended. This

reduces the noise level and increases meas-

urement reliability considerably. The flange of

the guide tube can be easily mounted as a

sandwich flange between vessel and sensor

flange.

Connections to the bypass tube

The connections to the bypass tubes must

be fashioned in such a way that only minimal

reflections are caused by the walls of the

connecting tubes. This is especially important

for the breather connection in the upper part

of the tube. Observe the following points:

• Use small openings for the connection.

• The diameter of the connecting tubes

should not exceed 1/3 of the bypass diam-

eter.

• The tube connections must not protrude

into the bypass tube.

• Large welding beads in the tubes should

be avoided.

• Additional connections to the bypass tube

must lie in the same plane as the upper

and lower vessel connection (above each

other or displaced by 180°).

Mounting and installation

Optimum connection to the bypass tube

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Vega VEGAPULS 43 Profibus PA Bedienungsanleitung Seite 19