VEGA VEGACAL 66 4 … 20 mA_HART - two-wire User Manual
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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.