Vega VEGABAR 81 4 … 20 mA_HART - Operating Instructions Bedienungsanleitung PDF herunterladen (Seite 14)

4 Mounting

VEGABAR 81 • 4 … 20 mA/HART

45018-EN-131010

Fig. 4: Temperature ranges

1 Process temperature

2 Ambient temperature

4.2 Ventilation and pressure compensation

Ventilation and pressure compensation are carried out with VE-

GABAR81viaalterelement.Itisairpermeableandmoisture-

blocking.

Caution:

Thelter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eectiveventilation,thelterelementmustalwaysbefreeof

buildup.

Caution:

Donotuseahigh-pressurecleaner.Thelterelementcouldbedam-

aged, which would allow moisture into the housing.

Thefollowingparagraphsdescribehowthelterelementisarranged

inthedierentinstrumentversions.

Thelterelementismountedintotheelectronicshousing.Ithasthe

following functions:

•

Ventilation electronics housing

•

Atmospheric pressure compensation (with relative pressure meas-

uring ranges)

Filter elements

Instruments in non-Ex,

Ex-ia and Ex-d-ia version

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Vega VEGABAR 81 4 … 20 mA_HART - Operating Instructions Bedienungsanleitung Seite 14