8
3 Product description
VEGADIF 85 • Profibus PA
53569-EN-230814
3.2 Principle of operation
VEGADIF 85 is suitable universally for applications in virtually all
industries. It is used for the measurement of the following pressure
types:
•
Differential pressure
•
Static pressure
Measured products are gases, vapours and liquids.
The differential pressure measurement enables the measurement of:
•
Level
•
Flow
•
Differential pressure
•
Density
•
Interface
The instrument is suitable for level measurement in closed, superim
-
posed pressure vessels. The static pressure is compensated by differ
-
ential pressure measurement. It is available as a separate measured
value for digital signal outputs.
Fig. 1: Level measurement with VEGADIF 85 in a pressurized vessel
The flow measurement is carried out via an effective pressure trans
-
mitter, such as an orifice plate or pitot tube. The device records the
resulting pressure difference and converts the measured value into
the flow. With digital signal outputs, the static pressure is available as
a separate measured value.
Q
p
1
p
2
+
–
Fig. 2: Flow measurement with VEGADIF 85 and orifice, Q = flow, differential
pressure Δp = p
1
- p
2
Application area
Measured products
Measured variables
Level measurement
Flow measurement