VEGA VEGAFLEX 82 Profibus PA - Manual (Page 16)

16
4 Mounting
VEGAFLEX 82 • Profibus PA
44220-EN-130910
vessels, the distance to the vessel wall should be at least 500 mm
(19.7 in).
During operation, the probe must not touch any installations or the
vessel wall. If necessary, fasten the probe end.
In vessels with conical bottom it can be advantageous to mount the
sensor in the center of the vessel, as measurement is then possible
nearly down to the lowest point of the bottom. Keep in mind that
measurement all the way down to the tip of the probe may not be pos-
sible. The exact value of the min. distance (lower dead band) is stated
in chapter "Technical data".
Fig. 5: Vessel with conical bottom
Plastic vessel/Glass vessel
The guided microwave principle requires a metal surface on the pro-
cess fitting. Therefore use in plastic vessels etc. an instrument version
with flange (from DN 50) or place a metal sheet (ø > 200 mm/8 in)
beneath the process fitting when screwing it in.
Make sure that the plate has direct contact with the process fitting.
When installing rod or cable probes without metal vessel wall, e.g.
in plastic vessels, the measured value can be influenced by strong
electromagnetic fields (emitted interference according to EN 61326:
class A).
Use a probe in coax version for applications in liquids.
Type of vessel