So you would then need to use a Divide instruction (DIV) to calculate Height of liquid in tank. Lets say this SCP will output to N7:0 So now N7:0 = PSI Inches of water column can be calculated with a known PSI and specific gravity of the liquid. (PSI of a liquid can be calculated in a linier manner so you could use an SCP instruction to scale the raw input value of the pressure transducer and scale it to PSI. If pressure transducer would work then it would give you PSI. But basically your tank size is a constant, so the main variable that will change in the equation is: What level is the liquid in the tank. lol I would agree that this is pretty confusing and higher math is not a strong point of mine either. So we are just killing fish not terrorist. Not on a military vessel, just a large At Sea Fishing Trawler / Processor. Hi Mark, Thanks for your kind comment's, although I am not really doing anything for you out here unless you eat a lot of fish. Anyway keep up the good fight, and please let us know how it turns out. We have a system that shoots a burst of air into the tank and a measurement is calculated from that. Also just a thought, is the pressure transducer you are using classified for hazardous locations / rated to be submerged in Jet Fuel? Onboard the ship I work on we are subject to a very strict criteria as to what we can and cannot use to measure level in our fuel tanks. Is the tank vented to atmospheric pressure or is it a sealed tank under pressure? What temperature fluctuations will the liquid in the tank be subject too? Is the tank perfectly level or slightly tilted toward the suction line of a pump? And as TConnolly pointed out the tank is probably not a perfect cylinder. From the reading I have done you will still have many factors that come in to play and can add variables to your calculation if your measurements have to be exacty precise. Hopefully others will be able to help you with specific questions, as I am still trying to wrap my head around this, its interesting though. Calculate WC from psi: Formula for Calculating Volume: Then you will still need to convert cubic inches into gallons. Here are a couple of links I found, hope they will help you out. Hello, The math on this one makes me crosseyed, once you get into a totally non linier vessel it seems to get very complicated.
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