VEGA VEGAFLEX 81 4 … 20 mA_HART - four-wire - Manual (Page 18)

18
4 Mounting
VEGAFLEX 81 • 4 … 20 mA/HART - four-wire
41825-EN-130314
sible. The exact value of the min. distance (lower dead band) is stated
in chapter "Technical data".
Fig. 7: 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 in vessels without metal walls,
e.g. in plastic vessels, the measured value can be influenced by
strong electromagnetic fields (emitted interference according to
EN 61326: class A). In this case, use a probe with coaxial version.
1 2
Fig. 8: Installation in non-metal vessel
1 Flange
2 Metal sheet
If possible, avoid sockets. Mount the sensor flush with the vessel top.
If this is not possible, use short sockets with small diameter.
Type of vessel
Socket