cryogenic level measurement
cryogenic level measurement
(OP)
hello,
I need to install level measurements (transmitters) in some tanks which are between 7 to 10meters heigh.
The tanks contain cryogenic fluids (oxygen, nitrogen, argon) and go down to temperatures of -196°C.
Tankpressure: max. 50mbarg.
Important note: the tanks cannot be emptied for installing the measurements.
Has anybody experience in this subject or could suggest a type of measurement or supplier?
thanks in advance.
I need to install level measurements (transmitters) in some tanks which are between 7 to 10meters heigh.
The tanks contain cryogenic fluids (oxygen, nitrogen, argon) and go down to temperatures of -196°C.
Tankpressure: max. 50mbarg.
Important note: the tanks cannot be emptied for installing the measurements.
Has anybody experience in this subject or could suggest a type of measurement or supplier?
thanks in advance.





RE: cryogenic level measurement
But these sensors need to be in the liquid, not the outside.
"Perfection - a result of many mistakes."
BJH
RE: cryogenic level measurement
RE: cryogenic level measurement
RE: cryogenic level measurement
That is the standard way to measure heights of cryo liquids. Of course, NASA uses thermocouples to detect temperature changes and therefore level changes, but that sounds too complicated to me.
OK, so there is another way. We used to have an old flat bottom tank that used some kind of float that was hooked up to a cable than went outside the tank. The cable moved a chart and the operators used a strap table to calculate the level. This also seems way too complicated. We sure are spoiled these days.
I bet I really haven't helped you much. OK how about this. The gas above the liquid level will be much warmer than the liquid. You can strap several RTDs or TC to the side of the tank and monitor temperature changes. Maybe NASA is on to something after all. You think they figured out they needed to monitor their LOX levels AFTER they built the tank? J/K. Good luck.
Oh and BTW, if you use the dp method, don't elevate the zero. We assume the gas phase of the cryogenic fluid in your tubing doesnt have any weight.
RE: cryogenic level measurement
http://