Hi guys. Was hoping someone could help me out with this. I did not install this, only was told to troubleshoot why the level isn't reading correctly. It is for an oil tank that is around 500 gallons. They are using a DP for the oil level measurement. It currently has LRV of 0 and URV of 48" of H20. The actual full mark is around 36". The problem is they put this vessel under a vacuum for eliminate the oil mist of the hot oil entering the tank. I', thinking that the LRV should be whatever the LP tap leg is seeing. A guy at my work said it shouldn't matter as it reads differential pressure. I don't think that is correct as the low pressure leg is going to be reading vacuum and the high pressure leg will not unless it goes completely empty. Could someone clarify this for me and help me to set up this transmitter. Personally I don't think a DP transmitter is the best for this application, but that's what they got. I used .90 as the specific gravity for the oil (just guessed) and came up with an URV of 40". Here is a quick diagram just to try and visualize what I'm working with. Thanks for any help. I'm not smart so that's why I'm here
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