VEGA VEGAFLEX 66 (-20…+250°C) Foundation Fieldbus - Manual (Page 14)

Excessive system vibration or shocks, e.g. caused by agitators or
turbulence in the vessel (e.g. from fluidisation) can cause the coax
probe of VEGAFLEX 66 to vibrate in resonance. Should a coax probe
of more than 1 m (3.281 in) length should be used, you can provide a
suitable support or guy directly above the end of the probe to stabilise
it.
Standpipes or bypass tubes are normally metal tubes with a diameter
of 30 … 200 mm (1.18 … 7.87 in). In measurement technology such a
tube corresponds to a coax probe. It does not matter if the standpipe is
perforated or slotted for better mixing. Lateral inlets with bypass tubes
also do not influence the measurement.
Measuring probes can be mounted in bypass tubes up to DN 200.
The max. temperature is 250 °C (482 °F).
If VEGAFLEX 66 is used in standpipes or bypass tubes, contact with
the tube wall should be avoided. We offer spacers as accessories for
fastening the probe in the middle of the tube.
Depending on the tube diameter or tube length, one or several spacers
can be mounted. With cable probes, the cable can also be strained to
avoid contact with the tube.
The max. temperature for the spacers is 250 °C (482 °F).
A special high temperature version of VEGAFLEX 66 with integrated
bypass tube can be used in applications with temperatures up to
400 °C (752 °F).
Keep in mind that buildup can form on the spacers. Strong buildup can
influence the measurement.
Standpipes or bypass
tubes
14 VEGAFLEX 66 • Foundation Fieldbus
4 Mounting
34172
-EN
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