VEGA VEGAFLEX 83 4 … 20 mA_HART - four-wire PFA insulated User Manual

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4 Mounting

VEGAFLEX 83 • 4 … 20 mA/HART - four-wire

41835-EN-130314

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.

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.
Higher sockets or sockets with a bigger diameter can generally be

used. They simply increase the upper blocking distance. Check if this

is relevant for your measurement.

Type of vessel

Socket