VEGA VEGABAR 66 Foundation Fieldbus - Manual (Page 14)

14
4 Mounting
VEGABAR 66 • Foundation Fieldbus
36740-EN-130321
2
1
2
1
2
1
1
2
Fig. 4: Position of the filter element
1 Filter element
2 Blind plug
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 may not be used for cleaning.
With instrument versions in protection IP 66/IP 68, 1 bar, the ventila-
tion is realised via the capillaries in the permanently connected cable.
The filter element is replaced by a blind plug.
4.2 Mounting preparations
For the suspension cable version note the following points when
selecting the mounting position:
•
Sideways movements of the transmitter can cause measurement
errors
1. Therefore, mount VEGABAR 66 in a calm area or in a suitable
protective tube
•
The suspension cable has a capillary for atmospheric pressure
compensation
2. Therefore lead the cable end into a dry space or directly to the
external electronics
The external electronics is provided with terminals and a filter element
for pressure compensation. Keep in mind for all versions:
•
The protective cover prevents mechanical damage to the measur-
ing cell. It should only be removed when the sensor is deployed in
extremely polluted water.