VEGA VEGABAR 81 Save sensor - Operating Instructions - Manual (Page 14)

14
4 Mounting
VEGABAR 81 • Slave sensor for electronic differential pressure
45049-EN-131011
The process assembly of instruments with Second Line of Defense
(gastight leadthrough) is completely encapsulated. An absolute pres-
sure measuring cell is used so that no ventilation is required.
1
1
Fig. 7: Position of the filter element - gastight leadthrough
1 Filter element
With relative pressure measuring ranges, the ambient pressure is
detected and compensated by a reference sensor in the electronics.
The filter element is mounted into the electronics housing. It has the
following functions:
•
Ventilation electronics housing
•
Atmospheric pressure compensation (with relative pressure meas-
uring ranges)
1
Fig. 8: Position of the filter element - IP 69K version
1 Filter element
Instruments with absolute pressure have a blind plug mounted
instead of the filter element.
4.3 Combination Master - Slave
In principle, any sensor combination within the VEGABAR 80 series is
allowed. The following requirements must be fulfilled:
•
Configuration, Master sensor suitable for electronic differential
pressure
•
Pressure type is identical for both sensors, i.e. relative pressure/
relative pressure or absolute pressure/absolute pressure
•
The master sensor must always measure the higher pressure
•
Measurement setup as shown in the following chapters
Instruments in IP 69K
version