KROHNE OPTISOUND 3020C 2wire EN - Manual (Page 41)

Supply voltage
Supply voltage
- non-Ex instrument
14 … 36 V DC
- EEx ia instrument 14 … 30 V DC
Permissible residual ripple
- <100 Hz
U
ss
<1 V
- 100 Hz … 10 kHz U
ss
<10 mV
Load see diagram
1000
750
500
250
14 18 16 20 22 24 26 28 30 32 34 36
Ω
V
4
1
2
3
Fig. 26: Voltage diagram
1 HART load
2 Voltage limit EEx ia instrument
3 Voltage limit non-Ex instrument
4 Supply voltage
Electrical protective measures
Protection
- Plastic housing
IP 66/IP 67
- Alu and stainless steel housing IP 66/IP 68 (0.2 bar) 5)
Overvoltage category III
Protection class II
5) Requirement to maintain the protection is the suitable cable.
OPTISOUND 3020 C - 4 … 20 mA/HART 41
Supplement
30507
-EN
-050914