Siemens SITRANS VP300 Operating Instructions Manual page 22

Optional alarm module, intrinsic safety "Ex ia/ib"
Connection values can be found in section "Technical data (Page 27)".
Non-hazardous area
Potentially explosive atmosphere - Zone 1
①
Digital sensor
②
Switching amplifier
③
Switch contact or short-circuit jumper
④
Alarm module
DI Digital input
DO Digital output
Figure 12 Alarm module, intrinsic safety "Ex ia/ib"
20
≥ 1
SITRANS VP300 (6DR63..)
A5E03359515-01, 03/2011