Vega VEGADIF 65 Operating Instructions Manual page 12

3 Product description
Functional principle
12
Density measurement
Fig. 5: Density measurement with VEGADIF 65, h = defined mounting distance,
Δp = differential pressure,
1 VEGADIF 65
Interface measurement
Fig. 6: Interface measurement with VEGADIF 65
1 VEGADIF 65
2
Liquid with highest density
3
Liquid with lowest density
A metallic measuring cell is used as sensor element. The process
pressures are transmitted via the separating diaphragms and filling oils
to a resistance measuring bridge (semi-conductor technology).
The difference of the existing pressures generates a change of the
bridge voltage. This change is measured, further processed and
converted into a corresponding output signal.
∆p
–
=
h g
+
1
= density of the medium, g = acceleration of gravity
–
3
+
2
1
VEGADIF 65 • Foundation Fieldbus