VEGA VEGAFLEX 82 4 … 20 mA_HART four-wire - Manual (Page 16)

16
4 Mounting
VEGAFLEX 82 • 4 … 20 mA/HART - four-wire
41830-EN-130314
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.
1 2
Fig. 6: Installation in non-metal vessel
1 Flange
2 Metal sheet
Type of vessel