Pyromation Series 642 - Manual (Page 11)

Series 642 Wiring
Pyromation, Inc. 11
Connection using other power supplies
HART ® connection using other power supplies, e. g. a SPS
4.4 Screening and potential equalization
Please take note when installing the device:
If screened (shielded) cables are used then the screen connected to the output (output signal 4 to
20mA) must be at the same potential as the screen at the sensor connection!
When operating in plants with high electromagnetic fields, it is recommended that all cables be
screened using a low ohm ground connection. Due to the possible danger of lightning strikes
screening is also recommended for cables that are run outside buildings!