4-20 ma signals shielding for DeltaV
4-20 ma signals shielding for DeltaV
(OP)
Hi all, need your advice. I am dealing now with upgrading of Bailey Infi to Deltav, (small heating/power plant). All field instruments should be disconnected from the Bailey cabinets, moved to the auxiliary JBoxes and using multipair cable connected to DeltaV cabinet. Somehow happened that this multipair cable has only one shield for all pairs.
Question is: replace the cable (time and money) or somehow to handle it. How bad it could be. Most of the equipment - auxiliary systems probably not so critical for the operation.
All opinions are welcome
Thanks
BB
Question is: replace the cable (time and money) or somehow to handle it. How bad it could be. Most of the equipment - auxiliary systems probably not so critical for the operation.
All opinions are welcome
Thanks
BB





RE: 4-20 ma signals shielding for DeltaV
Also if no power cables closely parallel this instrument cable then that helps a lot.
Keith Cress
kcress - http://www.flaminsystems.com
RE: 4-20 ma signals shielding for DeltaV
Take an Ohmeter and make sure no sheilds are connected in the field while you have them disconnected. If any are leave them off until you get a chance to fix.
Roy