Vega VEGABAR 51 Operating Instructions Manual page 14

4 Mounting
Ventilation and pressure
compensation
Temperature limits
14
The ventilation of the electronics housing as well as the atmosperic
pressure compensation for the measuring cell are realised via a filter
element in the area of the cable gland.
1
2
Fig. 3: Position of the filter element. Upper row single chamber housing, lower
row double chamber housing
1
Filter element
2
Blind stopper
Caution:
Due to the filter effect, the pressure compensation is time delayed.
When opening/closing the housing cover quickly, the measured value
can change for a period of approx. 5 s by up to 15 mbar.
Information:
Make sure that the filter element is always free of buildup during
operation. A high-pressure cleaner must not be used for cleaning.
With instrument versions in protection IP 66/IP 68, 1 bar, the ventilation
is realised via the capillaries in the permanently connected cable. The
filter element is replaced by a blind stopper.
Higher process temperatures often mean also higher ambient
temperatures. Make sure that the upper temperature limits stated in
chapter "Technical data" for the environment of the electronics housing
and connection cable are not exceeded.
1
2
1
VEGABAR 51 • Profibus PA
1
2
2