VEGA VEGACAL 66 4 … 20 mA_HART - two-wire - Manual (Page 44)

44
10 Supplement
VEGACAL 66 • 4 … 20 mA/HART - two-wire
30036-EN-130917
1000
750
500
250
12 18 16 14 20 22 24 26 28 30 32 34 36
Ω
V
4
1
2
3
Fig. 27: Voltage diagram
1 HART load
2 Voltage limit EEx-ia instrument
3 Voltage limit non-Ex/Ex-d instrument
4 Operating voltage
Operating voltage with illuminated display and adjustment module
Ʋ Non-Ex instrument 20 … 36 V DC
Ʋ EEx-ia instrument 20 … 30 V DC
Ʋ EEx-d-ia instrument 20 … 36 V DC
Permissible residual ripple
Ʋ < 100 Hz U
ss
< 1 V
Ʋ 100 Hz … 10 kHz U
ss
< 10 mV
Load see diagram
Electrical protective measures
Protection, depending on housing version
Ʋ Plastic housing IP 66/IP 67
Ʋ Aluminium housing, stainless steel
housing - investment casting, stain-
less steel housing - electro-polished
IP 66/IP 68 (0.2 bar) 2)
Ʋ Aluminium and stainless housing, in-
vestment casting (optionally available)
IP 66/IP 68 (1 bar)
Overvoltage category III
Protection class II
Functional safety (SIL)
Functional safety is already activated on instruments with SIL qualification ex factory. On instru-
ments without SIL qualification 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
2) A suitable cable is the prerequisite for maintaining the protection rating.