Hello friends,
I have been tasked to verify if a bubbler system is operating correctly.
The transmitter is a Foxboro IDP20 with a range of 0 to 120 in H2O. The structure with the process water in it is 8 feet in depth. I'm applying 20 psi of air at 1.5 liters/min. Whats got me concerned is that the display is showing negative value of 1.4 in of H2O and as I reviewed the setup there is a negative .4 in of H2O offset programmed in. Can someone help me understand why this -.4 offset might be used. It seems like such a small negligible value. Also a negative offset is something I don't completely understand.
I'm not convinced this xmtr is setup correctly, but I need to understand a few things to verify the setup.
Thank You for any input you can offer.
I have been tasked to verify if a bubbler system is operating correctly.
The transmitter is a Foxboro IDP20 with a range of 0 to 120 in H2O. The structure with the process water in it is 8 feet in depth. I'm applying 20 psi of air at 1.5 liters/min. Whats got me concerned is that the display is showing negative value of 1.4 in of H2O and as I reviewed the setup there is a negative .4 in of H2O offset programmed in. Can someone help me understand why this -.4 offset might be used. It seems like such a small negligible value. Also a negative offset is something I don't completely understand.
I'm not convinced this xmtr is setup correctly, but I need to understand a few things to verify the setup.
Thank You for any input you can offer.