Vega VEGAPULS 61 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA__HART two- Bedienungsanleitung PDF herunterladen (Seite 22)

max

min

≥ 2 mm x h

max

90°

3 ... 4 h

max

≥ 50 mm

90°

2 3

Fig. 17: Flow measurement with

rectangular ﬂume: d = min. distance of the

sensor; h

max.

= max. ﬁlling of the rectangular ﬂume

1 Overﬂow oriﬁce (side view)

2 Headwater

3 Tail water

4 Overfall oriﬁce (view from bottom water)

Khafagi-Venturi ﬂume

In general, the following points must be observed:

l Installation of the sensor at the inlet side

l Installation in the centre of the ﬂume and vertical to the liquid

surface

l Distance to the Venturi ﬂume

l Min. distance of the sensor to max. storage level

3 ... 4 x h

max

90°

max

Fig. 18: Flow measurement with Khafagi-Venturi ﬂume: d = Min. distance

sensor; h

max.

= max. ﬁlling of the ﬂume; B = tightest constriction in the ﬂume

1 Position sensor

2 Venturi ﬂume

22 VEGAPULS 61 • 4 … 20 mA/HAR

T two-wire

4 Mounting

28434-EN-100426

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 71 72

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Vega VEGAPULS 61 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA__HART two- Bedienungsanleitung Seite 22