VEGA VEGABAR 66 4 … 20 mA_HART - Manual (Page 62)

62
10 Supplement
VEGABAR 66 • 4 ... 20 mA/HART
36737-EN-130321
Material
Ʋ Housing ABS
Ʋ Inspection window Polyester foil
Voltage supply
Operating voltage
Ʋ Non-Ex instrument 12 … 36 V DC
Ʋ Ex-ia instrument 12 … 30 V DC
Ʋ Exd instrument 18 … 36 V DC
Operating voltage with illuminated display and adjustment module
Ʋ Non-Ex instrument 20 … 36 V DC
Ʋ Ex-ia instrument 20 … 30 V DC
Ʋ Ex d 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
1000
750
500
250
12 18 16 14 20 22 24 26 28 30 32 34 36
Ω
V
4
1
2
3
Fig. 34: 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 Transmitter IP 68 (25 bar)
Ʋ Housing, standard IP 66/IP 67 21)
Ʋ Aluminium and stainless housing
(optionally available)
IP 68 (1 bar) 22)
Ʋ External housing IP 65
Overvoltage category III
21) Instruments with gauge pressure measuring ranges cannot detect the ambient pressure when submerged, e.g.
in water. This can lead to falsification of the measured value.
22) Only with instruments with absolute pressure ranges.