VEGA VEGAPULS 68 (≥ 2.0.0 - ≥ 4.0.0) Profibus PA User Manual

Page 21

4 Mounting

VEGAPULS 68 • Profibus PA

36537-EN-130205

Tip:

The instrument is also optionally available with an antenna extension.

The antenna length can be selected (either ex works or later) to allow

the antenna to protrude slightly out of the end of the mounting socket.

Due to the antenna extension however, disturbing reflections are

generated in the close-up range. This can lead to an increase in the

required minimum distance, especially with poorly reflecting media

such as plastic powder. In practice, a cleanly constructed mounting

socket, if necessary with rounded edges, introduces fewer disturbing

influences than an antenna extension.

To measure as much of the vessel volume as possible, the sensor

should be aligned so that the measuring beam reaches the lowest

level in the vessel. In a cylindrical silo with conical outlet mounting is

carried out on a socket. It should be positioned on one third up to the

half of the vessel radius.

r...

1 3

1 2

Fig. 16: Orientation

If mounting in the centre of the silo is not possible, the sensor can be

directed to the vessel center by using the optional swivelling holder.

The following description shows a simple way to determine the requi-

red angle of inclination.

Orientation