15
4 Mounting
VEGABAR 81 • 4
… 20 mA
45025-EN-140228
The filter element is mounted into the electronics housing. It has the
following functions:
•
Ventilation of the electronics housing
•
Atmospheric pressure compensation (with relative pressure meas
-
uring ranges)
→
Turn the housing so that the filter element points downward after
the instrument is installed. This provides better protection against
buildup.
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 of the electronics housing
•
Atmospheric pressure compensation (with relative pressure meas
-
uring ranges)
→
Turn the housing so that the filter element points downward after
the instrument is installed. This provides better protection against
buildup.
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.
Instruments with Second
Line of Defense
Instruments in IP 69K
version