Temperature correction for ultrasonic oil level gauge #2852
rowanbradley
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I have an Apollo (rocket shaped) oil level detector on my oil tank. I am reading its results in cm using rtl_433. But assuming that this is actually a measurement of the time taken for the ultrasonic signal to get from the sensor to the oil surface and back again, presumably I need to correct this for the changes in sound velocity with temperature, and the changes in oil density with temperature, and (maybe) the expansion of the (plastic) tank, if I want to accurately read the amount of oil (in kg) in the tank. Does anyone have any information on how to do this? Presumably the same will apply to the Watchman and other ultrasonic sensors.
Thank you - Rowan
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