Ground loops got your process down? Use signal isolators
Acromag advises using signal isolators and splitters to eliminate 4-20 mA errors and ground loops between instruments.
——选择适当的和具成本效益的隔离器by understanding of the application and consideration of future expansion requirements.
– Consider various isolator models to cover various system configurations.
– Ask for help, if needed, to decide among two-, three-, or four-wire electrical connections. Will the isolator operate from ac, dc, or loop power? Do you need an input, output, or 3-way (input, output, power) isolators?
www.acromag.com/sites/default/files/Eliminate%20Ground%20Loops%202010_P2.pdf
Also see from Control Engineering :
– Tutorial: Running down interference to improve device performance ;
– Ground Loops ; and
– Process control channel .
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