VEGA VEGAPULS 81 User Manual

Page 37

VEGAPULS 64 and 81

Mounting and installation: Measurements of liquids

Pipe antenna

(surge or bypass pipe)

Pipe antennas are preferably used on vessels
with many installations such as e.g. calorifiers,

heat exchangers or quick stirrers. The meas-

urement of products with strong turbulences,

and installations in the vessel do not cause

false reflections.

By focusing of the radar signal within the

measuring pipe, also products with small
dielectric constants (

1,5 … 3) can be meas-

ured.

Pipe antenna system in the tank

Pipe flange system as bypass pipe

Extended bypass pipe

Surge hole

Type
plate

max.

min.

Surge pipe
welded to the

tank

Surge pipe in the
socket piece

100 %

0 %

Casting nose

50 %

0 %

100 %

The surge pipes which open at the bottom

must reach the requested min. level as a

measurement is only possible in the pipe.

Note the upper required ventilation hole in the

surge pipe. These ventilation and surge holes

must be in one axis with the type plate

(VEGAPULS 64) or the casting nose
(VEGAPULS 81).

As an alternative to the surge pipe in the ves-
sel, a pipe antenna outside the vessel is possi-

ble as a bypass pipe.

Note that with the measurement in a pipe, the

max. measuring range is slightly reduced (see

Technical Data).