Measurement Setup - Flow - Vega VEGAPULS 6X Operating Instructions Manual

4 Mounting
Mounting
Flume
36
•
Min. distance, sensor reference plane to upper edge of upper tube
connection > 200 mm
•
The antenna diameter of the sensor should correspond to the
inner diameter of the tube
•
For stand pipe lengths > 3 m the " Application stand pipe > 3 m"
must be selected for the parametrisation
•
For stand pipe lengths > 3 m, the antenna diameter must be cho-
sen as large as possible, but at least 80 mm/3"
•
A false signal suppression with the installed sensor is recom-
mended but not mandatory
•
The measurement through a ball valve with unrestricted channel
is possible
•
The deviation can increase in the area of the connecting tube to
the container ± 200 mm
Constructional requirements on the bypass pipe:
•
Material metal, smooth inner surface
•
In case of an extremely rough tube inner surface, use an inserted
tube (tube in tube) or a radar sensor with tube antenna
•
Flanges are welded to the tube according to the orientation of the
polarisation
•
Gap size with junctions ≤ 1 mm, for example, when using a ball
valve or intermediate flanges with single pipe sections
•
Diameter should be constant over the complete length
4.7

Measurement setup - Flow

In general, the following must be observed while mounting the device:
•
Mounting the sensor on the upstream or inlet side
•
Installation in the centre of the flume and vertical to the liquid
surface
•
Distance to the overfall orifice or Venturi flume
•
Min. distance to the max. height of the orifice or flume for optimum
accuracy: 250 mm (9.843 in)
•
Requirements from approvals for flow measurement, e.g.
MCERTS
Every flume generates a different level of backwater depending on its
type and version. The specifications of the following flumes are avail-
able in the instrument:
Predefined curves
A flow measurement with these standard curves is very easy to set
up, as no dimensional information of the flume is required.
•
Palmer-Bowlus flume (Q = k x h
•
Venturi, trapezoidal weir, rectangular flume (Q = k x h
•
V-Notch, triangular overfall (Q = k x h
At smaller distances the measuring accuracy is reduced, see "Technical
4)
data".
4)
)
1.86
)
2.5
VEGAPULS 6X • Two-wire 4 ... 20 mA/HART
)
1.5