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Like I would be concerned about the effect of the diesel fumes on electronics, particularly the ultrasonic transponder and coatings on any discrete components. However diesel will act as a solvent for rubber and plastics and may speed the corrosion of some metals. The diesel will not affect the glass fibre and, accroding to this site, it will also not affect the resin Printed Circuit Boards are glass fibre reinforced epoxy resin. As for accuracy, something is better than nothing at this stage. Will try to save it as much as I can but that is a secondary issue. You go over there you test you bring it back, yes diesel has fumes but I inquired about that and I guess the meter I il make will only have the ultrasonic exposed. You will not be able to avoid it if you want to have any idea of it's accuracy. It is a necessary part of the development cycle. No matter how accurate the calculations, without testing and calibration you are just guessing. As I said before I would be much more concerned about the harsh environment. I agree with the density is not an issue as the ultrasonic works off of the surface reflection. The things I know is the cap height and cape base radius. Or am I missing something? is there another way to find all that? I can get on top of it but I guess I would need to draw some geometrical lines on it? I still am unsure whether I can get that big R over there. You could probably do a test using a PVC pipe filled with fuel. I don't see why the ultrasonics would not work with diesel. This website will let you calculate the volume of fuel in the end caps Some error is acceptable but not some 300 400 Litres. The accuracy needs to be + - 50 litres or something, it is not fixed. My idea is to use ultrasonic against to find the empty height of the tank so with the filled height, volume of diesel that is present, can be approximated. I did t he volumetric analysis of the tank. To make those things, one needs to calibrate and develop a scale (which is currently not available). There are no dip sticks or vertical scale to measure diesel against. Normally flow meters yield low accuracy on low flow rates (that is what I was told). Whether there needs to be a flow meter (at least) but still, a level indicator would be much better. The tank is a horizontal cylinder with spherical caps on both sides (not a perfect cylinder). 15000L is written on the tank which is from an unreliable source, The exact internal dimensions of the tank are unknown. It is a diesel tank so density is a bit lower than water. The tank cannot be made empty and is being used at all times. I have taken this problem of making an automatic level indicator for a 15000L tank.