Vega VEGABAR 64 4 … 20 mA_HART Bedienungsanleitung PDF herunterladen (Seite 62)

1000

750

500

250

12 18

1614 20 22 24 26 28 30 32 34 36

Ω

Fig. 30: Voltage diagram

1 HART load

2 Voltage limit EEx-ia

instrument

3 Voltage limit non-Ex/Exd instrument

4 Operating voltage

Electrical protective measures

Protection class

- Housing, standard IP 66/IP 67

15)

- Aluminium and stainless housing (op-

tionally available)

IP 68 (1 bar)

16)

- Transmitter in IP 68 version IP 68

- External housing IP 65

Overvoltage category III

Protection class II

Functional safety (SIL)

The functional safety is already activated Ex factory for instruments with SIL qu aliﬁcation. For

instruments Ex factory without SIL qualiﬁcation, the functional safety must be activated by the user

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

Functional safety according to IEC 61508-4

- Single channel architecture (1oo1D) up to SIL2

- double channel diversitary redundant

architecture (1oo2D)

up to SIL3

15)

Instruments with gauge pressure measuring ranges cannot detect the am-

bient pressure when submerged, e.g. in water. This can lead to falsiﬁcation

of the measured value.

16)

Only with instruments with absolute pressure ranges.

62 VEGABAR 64 • 4 … 20 mA/HAR

10 Supplement

27525-EN-081209

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