Steve_D
Member
Guys, This is killing me! I am commissioning some RTD's which are connected in some stainless steel tanks and pipes. Inside the tanks and pipes is milk. so far so good. When I connect my RTD up to my OMRON C1000 analog input card (with the screen connected to the screen terminal of the card and not in the feild) my temperature varies +- 4 degrees every display update on my SCADA screen, some times more, some times less but also appears to not be very accurate. If I remove my RTD from the pipe work the reading is dead steady and accurate. I connected my RTD calibration unit to the RTD wires while in the pipework and it shows the RTD resistance is steady so somethings upsetting the electronics in the pucken puck. Not a VSD on site. When I connected the card shield to earth it made the reading less accurate and not a lot steadier. Im guessing that noise is being induced through the Steelwork otherwise the "hanging in the air" test would not have worked as well as it did. Any suggestions on what it might be and how to fix it??
Regards
Steve D
Regards
Steve D