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Measuring liquid level of a sealed container

Hasanga

I need to measure liquid level inside a sealed container there can't be placed any sensors inside it. This is a shock absorber in a very powerful machine. So in operation the pressure and temperature will be high and flowing speed of liquid is also high . 

   1. Container is steel cylinder, height 1 meter, diameter 8 inches,          wall thickness 3 mm. it      can be tilted horizontal to 60 degrees         in vertical. But can't be            moved. It contains a nother hollow       steel cylinder.

         a. This small cylinder is same height, diameter 5 inches. And             have a orifice of 5 cm on its wall so liquid can move in and out            from this cylinder to outer cylinder freely. 

I will be measuring liquid level before operation and during trouble shooting only. What methods can be used?

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  • Perhaps an unconventional ultrasonic solution. I don't know if this concept will work, but...
    The cylinder with the hydraulic oil will be more dense than the cylinder without it. Set the sensor outside the second cylinder and at a level just below the oil. If the oil level falls, the ultrasonic reading should change.  Maybe it's not ultrasonics, but whacking an empty cylinder produces a different sound that whacking one filled with liquids.  Maybe it's a series of vibrational sensors.

  • in reply to kmikemoo

    Thank you all for your time and effort for trying to help. This is just a routine check. It's like you check oil level by dip stick on car time to time or if you have not used it for a while. You just make sure it for safety. This is very crucial in this machine as if it fails many lives may be lost. So it's a safety measure.

  • in reply to Hasanga

    I did some searching, there was a suggestion to check temperature from outside along the cylinder as liquid will quickly absorb heat energy rather than air. At the interface there will be change of temperature. Will this be a practical solution what are the challenges to it?

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