Vega VEGAPULS 62 Operating Instructions Manual page 23

4 Mounting
Mounting in the vessel
insulation
Flow measurement with
rectangular flume
22
Material metal, smoother inner tube
l
In case of an extremely rough tube inner surface, use an inserted
l
tube (tube in tube) or a radar sensor with tube antenna
Flanges are welded to the tube according to the orientation of the
l
polarisation level
Gap size with junctions ≤ 0.1 mm, for example, when using a ball
l
valve or intermediate flanges with single pipe sections
The antenna diameter of the sensor should correspond to the
l
inner diameter of the tube
Diameter should be constant over the complete length
l
Instruments for a temperature range up to 250 °C or up to 450 °C have
a distance piece between process fitting and electronics housing. Ths
distance piece is used for thermal decoupling of the electronics
against high process temperatures.
Information:
The distance piece must only be incorporaed up to max. 50 mm in the
vessel installation. Only then, a reliable temperature decoupling is
guaranteed.
Fig. 15: Mounting of the instrument with insulated vessels.
Electronics housing
1
2 Distance piece
Vessel insulation
3
The short examples give you introductory information on the flow
measurement. Detailed planning information is available from flume
manufacturers and in special literature.
VEGAPULS 62 • 4 ... 20 mA/HART two-wire
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