VEGA VEGADIF 65 Foundation Fieldbus - Manual (Page 9)

9
3 Product description
VEGADIF 65 • Foundation Fieldbus
36130-EN-130417
Flow measurement
Q Q
p
1
p
1
p
2
p
2
Q ~ ∆p Q ~ ∆p
+ + – –
1 2
Fig. 3: Flow measurement with VEGADIF 65 and DP flow element, Q = flow, Δp
= differential pressure, Δp = p
1
- p
2
1 Orifice
2 Pitot tube
Level measurement
1 2 3
h = ∆p
ρ g
+
+
–
–
h
+
–
Fig. 4: Level measurement with VEGADIF 65. Δp = differential pressure, ρ =
density of the medium, g = acceleration of gravity
1 Basic version with effective pressure lines
2 Version with flange chemical seal
3 Version with capillaries and cell chemical seals