Siemens 6DR50 Series Operating Instructions Manual page 20

Safety information
2.4 Use in hazardous areas
Loss of safety of device with type of protection "Intrinsic safety Ex i"
If the device has already been operated in non-intrinsically safe circuits or the electrical
specifications have not been observed, the safety of the device is no longer ensured for use
in hazardous areas. There is a danger of explosion.
• Connect the device with type of protection "Intrinsic safety" solely to an intrinsically safe
• Observe the specifications for the electrical data on the certificate and/or in Chapter
18
WARNING
circuit.
"Technical data (Page 241)".
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12