VEGA MINITRAC 31 Foundation Fieldbus User Manual

Page 9

3 Product description

MINITRAC 31 • Foundation Fieldbus

41782-EN-131119

Fig. 2: MINITRAC 31 - Application possibilities
1 Level measurement - Residue detection

2 Point level detection

3 Density measurement

4 Mass flow measurement

Further application possibilities are also the use as X-ray alarm or real

value correction.
If X-ray alarm is selected, the instrument detects radiation from exter-

nal sources. Possible external radiation sources can be, for example,

a weld joint test in a neighbouring facility or other radiation-based

instruments.
When the instrument operates as real value correction it transmits the

real value to correct another radiation-based sensor. The measure-

ment can thus be adapted perfectly to the situation in the vessel.

In radiation-based measurement, a Caesium-137 or Cobalt-60 iso-

tope emits focussed gamma rays that are attenuated when penetrat-

ing the tube wall and the medium. The NaI detector on the opposite

side, on a pipeline for example, receives the radiation. The intensity

of the radiation is dependent on the density of the measured media.

The measuring principle has proven to be very reliable in conjunction

with extreme process conditions because it measures contactlessly

Functional principle