Measurement of cryogenic liquids
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There is a tank here used for measuring liquid nitrogen at low temperatures; a differential pressure gauge and transmitter are employed, and the level indication is accurate. From time to time, the level suddenly returns to zero or the maximum value. The valve is closed, and calibration against a reference standard is performed – everything works normally once it’s reinstalled. Could everyone please help identify the cause of this issue? What type of level gauge would be suitable for use in low-temperature environments?
Is it a problem with insulation? Partially vaporized? It worked normally after removing the tube for venting.
There is nothing wrong with choosing a differential pressure transmitter; the person in question should check whether there are any issues with the instrument’s power supply, grounding, cables, or the transmitter itself.
The float is vulnerable to frost forming on the outside, which can severely affect measurements
“The liquid level suddenly returns to zero or the maximum level after a while. Is that really the case? What Guo Zhen meant was that the level of pressure measurement using pipes is extremely poor; it’s as bad as, if not worse than, feces. . . :Lol: 1. If the differential pressure gauge is installed at the same height as the pressure tapping point in the gas phase. 2. If it’s installed……… secret techniques and advanced methods are omitted here. . . I’ll let you know once I receive a 1,000 RMB red envelope on WeChat. . . :P 3, Brother lost weight in March. Selling courses today – guaranteed to run flawlessly for 10 years without any maintenance. . . Is there anyone who wants to spend a lot of money to learn a small skill? {:2_42:}
The problem isn’t with the gauge; using a differential pressure level gauge at low temperatures is the correct approach
Using a differential pressure transmitter is no problem; that’s how we install them here. The cryogenic liquid vaporizes inside the pressure guide tube, serving as a barrier.