Vega VEGABAR 53 4 … 20 mA_HART Bedienungsanleitung PDF herunterladen (Seite 57)

10 Supplement

VEGABAR 53 • 4 … 20 mA/HART

36722-EN-130321

Ʋ Non-Ex instrument 20 … 36 V DC

Ʋ Ex-ia instrument 20 … 30 V DC

Ʋ Exd instrument 20 … 36 V DC

Permissible residual ripple

Ʋ <100Hz U

< 1 V

Ʋ 100Hz…10kHz U

< 10 mV

Load see diagram

1000

750

500

250

1816 20 22 24 26 28 30 32 34 36

Ω

Fig. 29: Voltage diagram

1 HART load

2 Voltage limit Ex-ia instrument

3 Voltage limit non-Ex/Ex-d instrument

4 Operating voltage

Electrical protective measures

Protection rating

Ʋ Housing, standard IP 66/IP 67

23)

Ʋ Aluminium and stainless housing

(optionallyavailable)

IP68(1bar)

24)

Ʋ Process component in IP 68 version IP68(25bar)

Ʋ External housing IP65,IP66/IP68(0.2bar)

Overvoltage category III

Protection class II

Functionalsafety(SIL)

FunctionalsafetyisalreadyactivatedoninstrumentswithSILqualicationexfactory.Oninstru-

mentswithoutSILqualicationexfactory,thefunctionalsafetymustbeactivatedbytheuservia

the display and adjustment module or via PACTware for applications according to SIL.

Functional safety according to IEC 61508-4

Ʋ Singlechannelarchitecture(1oo1D) up to SIL2

23)

Instruments with gauge pressure measuring ranges cannot detect the ambient pressure when submerged, e.g.

inwater.Thiscanleadtofalsicationofthemeasuredvalue.

24)

Only with instruments with absolute pressure ranges.

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