VEGA VEGAPULS 43 Profibus PA - Manual (Page 15)

VEGAPULS 43 – Profibus PA 15
Mounting and installation
Optimum measuring conditions exist when
the emission cone reaches the measured
product perpendicularly and when the emis-
sion cone is free from obstructions.
Examples of vessel echoes
The following vessel images show a typical
echo pattern in a vessel. The example shows
a process vessel with a slow double-bladed
stirrer. In the lower area, the vessel is
equipped with heating spirals. A thin, angled
inlet tube ends in the vessel centre between
the stirrer blades.
Empty vessel
False echoes from the top down:
- first inlet tube fastening
- upper stirrer blade
- second inlet tube fastening
- angled inlet tube
- upper heating tubes
- lower stirrer blade
- remaining heating tubes
- vessel bottom
¼ filling
When the vessel is empty, you see the ech-
oes of the vessel installations around the
emission cone. Beside the large bottom echo,
you see a number of additional false echoes.
The false echoes of the vessel installations
are saved during a false echo recording. For
this reason, the false echo recording must be
carried out when the vessel is empty.
After filling, the bottom echo is replaced by
the product echo.
½ filling