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Sensors and actuators using 4...20mA loop are subject to electromagnetic interference (EMI), especially when the wires are long and/or they run close to other wires with noisy signals, such as those going to variable frequency drives (VFD) and alike.  Our data filters greatly reduce such interference while not affecting the core signal.  The filters are completely passive and do not require power.

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Sometimes it may be beneficial to also consider filtering adjacent noisy wires - we offer special filters for VFD and servo motors - consider them for better results.  You can also try ground filters - often clean ground is a solution for a number of problems.

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