18
4 Mounting
VEGABAR 86 • Secondary Device for electronic differential pressure
48048-EN-220817
sensor. Depending on the instrument version, output as 4 … 20 mA
signal or digitally via HART, Profibus PA or Foundation Fieldbus.
To reach the Safety Integrity Level (SIL) for the electronic differential
pressure, both instruments must be SIL-qualified.
4.4 Differential pressure measurement
With the Primary/Secondary combination, a gauge different measure-
ment can be realized.
2
3
1
Fig. 10: Measurement setup with a level difference measurement
1 Primary Device
2 Secondary Device
3 Screen
4.5 Interface measurement
With the Primary/Secondary combination also an interface measure-
ment can be realised.
Requirements for a functioning measurement are:
•
Vessel with changing level
•
Products with steady densities
•
Interface always between the measurement points
•
Total level always above the upper measurement point
Measurement setup
Measurement setup
