VEGA VEGAPULS 62 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART four-wire Approval according to LPR radio standard - Manual (Page 22)

Constructional requirements on the bypass pipe:
l Material metal, smoother inner tube
l In case of an extremely rough tube inner surface, use an inserted
tube (tube in tube) or a radar sensor with tube antenna
l Flanges are welded to the tube according to the orientation of the
polarisation level
l Gap size with junctions ≤ 0.1 mm, for example, when using a ball
valve or intermediate flanges with single pipe sections
l The antenna diameter of the sensor should correspond to the
inner diameter of the tube
l Diameter should be constant over the complete length
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.
ma
x.
5
0
mm
(1
.9
7
")
1
2
3
Fig. 15: Mounting of the instrument with insulated vessels.
1 Electronics housing
2 Distance piece
3 Vessel insulation
The short examples give you introductory information on the flow
measurement. Detailed planning information is available from flume
manufacturers and in special literature.
Mounting in the vessel
insulation
Flow measurement with
rectangular flume
22 VEGAPULS 62 • Approval according to LPR radio standard
4 Mounting
41719
-EN
-120301