KROHNE OPTISOUND 3020C 4wire EN - Manual (Page 40)

Electrical protective measures
Protection
IP 66/IP 67
Overvoltage category III
Protection class I
Approvals 6)7)
ATEX ATEX II 1G, 1/2G, 2G EEx ia IIC T6
6) Deviating data with Ex applications: see separate safety instructions.
7) Depending on order specification.
40 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire
Supplement
30508
-EN
-050914