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Hi, just wanted to provide an update. It appears that what is happening is that the DC brush-less motor and controller are radiating a significant amount of noise. Some of my sensors are installed in stainless steel pipes that have no electrical connection to the frame of the power plant. The...

Thanks again, I appreciate it. It sounds like the pressure sensor is experiencing saturation resulting from a ground loop situation. I wonder if the sensor has been damaged making it more susceptible? I am currently putting all your ideas into a test procedure that I can run on my next trip...

Keith, Thanks for the additional ideas and the kind words. What do you mean by "latchup?" Tim

Hi Dan, Thanks for the response. The setup is at another facility but I will be traveling back there again soon. I will take the measurements you have suggested. The 24 VDC power supply is floating, its negative is not connected to the frame of the system. The transmitter is a two wire, 24...

I recently observed some strange pressure sensor behavior and am looking for some troubleshooting assistance. We have a number of 0-10 barg, 4-20 mA output pressure sensors. They are installed in an air and coolant supply system. The air compressor motor in the system is a brushless DC motor...