Siemens SITRANS DA400 Operating Instructions Manual page 34

Connecting
5.9 Connect the ground
Be careful that the closing contact is separated correctly from current circuits that are not intrinsically safe. To
1)
assure a higher electromagnetic resistance, in a disturbed environment shielded conduits should be used for signal
inputs In 1 to In 4.
See also
Connecting structure-borne sound sensors (Page 27)
Connect PROFIBUS PA (Page 31)
Cable gland (Page 26)
34
SITRANS DA400 for material flow monitoring with protection against explosion
Operating Instructions, 09/2007, A5E00841152-01