Can an Ultrasonic wave penetrate a LPG cylinder

In summary: Ultrasonic sensors are used to measure distances between two points, and can be used to measure the level of liquids or gases inside tanks or containers. They use sound waves to pass through the object and reflect off of the surfaces. By measuring the time it takes for the reflected sound waves to return, the level of the liquid or gas can be determined. Ultrasonic sensors can be modified to be installed inside the tank, or they can be purchased as standalone devices.
  • #36
The external temperature difference sensed is driven either by the internal evaporation of gas as gas is used or by externally applied hot water when gas is not being used.
A system to measure liquid level when gas is not being used will need to apply external heat. The challenge will be to apply the external heat evenly and then sense the temperature profile as it returns to ambient conditions.
 
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  • #37
Baluncore said:
The external temperature difference sensed is driven either by the internal evaporation of gas as gas is used or by externally applied hot water when gas is not being used.
A system to measure liquid level when gas is not being used will need to apply external heat. The challenge will be to apply the external heat evenly and then sense the temperature profile as it returns to ambient conditions.
You are right. Would it be easier to have a few seconds venting of the gas?

When we get down to it, there's a lot to be said for just weighing the bottle continuously. The installation for that would be pretty cheap and robust and could even work (low pass filtered) when the bottle was in a moving vehicle.
 

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