Siemens SITRANS P Series Compact Operating Instructions page 20

Connecting
5.2 Electrical connections
Version with explosion protection: 4 to 20 mA
The grounding connection is conductively bonded to the transmitter enclosure.
Connecting with current output and connector in accordance with EN 175301 (Ex)
Connecting with current output and connector M12x1 (Ex)
20
Compact Operating Instructions, 02/2019, A5E03304437-AB
SITRANS P220