I know this is a month late: lost phone service for a month. Regarding electrical noise; created from flowing electrons. Sensor wiring has sheilding in it, whether a woven cover or foil wrap or a wire running along the cabling. The shield should only be connected at one end. That should be the instrument end. If connected on both ends the current in the sensor wires can have a current induced from current flowing through the shield.

While working at a plant in Fort McMurray I can across two examples. One was twmp sensors giving erractic reading for the gearbox on a large crusher. The sensor wires had a woven shield similar to coax cabling that the installing electrician had not cut of at the sensor end but bent back. It was grounding on the conduit fitting to the sensor head. A couple of the sensors were inaccessible in operation so for a temporary fix I disconnected the shield at a junction box until the crusher was down for another repair. Had to go through lockout procedures.


The other situation was another electrician had pulled Belden wiring through a conduit with the wires for a 400HP motor giving erratic readings which turned out to be 60Hz.
Both examples are kind of extreme cases but sensor wires run by an alternator would also be affected.
Dale Davies



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