VEGA VEGABAR 82 HART and accumulator pack - Operating Instructions - Manual (Page 15)

15
4 Mounting
VEGABAR 82 • HART and accumulator pack
45029-EN-131107
1
2
Fig. 7: Temperature ranges
1 Process temperature
2 Ambient temperature
4.2 Ventilation and pressure compensation
Ventilation and pressure compensation are carried out with VE-
GABAR 82 via a filter element. It is air permeable and moisture-
blocking.
Caution:
The filter element causes a time-delayed pressure compensation.
When quickly opening/closing the housing cover, the measured value
can change for approx. 5 s by up to 15 mbar.
For effective ventilation, the filter element must always be free of
buildup.
Caution:
Do not use a high-pressure cleaner. The filter element could be dam-
aged, which would allow moisture into the housing.
The following paragraphs describe how the filter element is arranged
in the different instrument versions.
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)
→
Turn the housing in such a way that the filter element points
downward after installtion of the instrument. This provides better
protection against buildup.
Filter elements
Instruments in non-Ex,
Ex-ia and Ex-d-ia version