VEGA VEGAPULS 68 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART two-wire - Manual (Page 63)

1000
750
500
250
15 18 16 20 22 24 26 28 30 32 34 36
Ω
V
4
1
2
3
Fig. 41: Voltage diagram
1 HART load
2 Voltage limit EEx-ia instrument
3 Voltage limit non-Ex/Exd instrument
4 Operating voltage
Electrical protective measures
P rotection, depending on housing version
-
P lastic housing IP 66/IP 67
-
A luminium housing, stainless steel
housing - investment casting, stainless
steel housing - electro-polished
IP 66/IP 68 (0.2 bar) 8)
-
A luminium and stainless housing, in-
vestment casting (optionally available)
IP 66/IP 68 (1 bar)
O vervoltage category III
P rotection class II
Functional safety (SIL)
T he functional safety is already activated ex factory for instruments with SIL qualification. For
instruments without SIL qualification ex factory, the functional safety must be activated by the user
via the indicating and adjustment module or via PACTware for applications according to SIL.
F unctional safety according to IEC 61508-4
-
S ingle channel architecture (1oo1D) up to SIL2
-
double channel diversitary redundant
architecture (1oo2D) up to SIL3
Y ou can find detailed information in the supplied Safety Manual of the instrument series or under
"
www.vega.com", "Downloads", "Approvals".
8) A suitable cable is the prerequisite for maintaining the protection class.
VEGAPULS 68 • 4 … 20 mA/HART two-wire 63
10 S upplement
29261
-EN
-090305