| 摘要 |
An object is to provide a liquid level sensor device (7, 17) for liquefied gas enabling measurement on a liquid level (13) of liquefied gas (12) having a boiling point in the vicinity of 21 K, e.g. liquid hydrogen, accurately and with good reproducibility and enabling simple production with good reproducibility. The present invention is a liquid level sensor device (7, 17) for liquefied gas (12) including compound containing magnesium and boron arranged in succession in the longitudinal direction over the entire or a part of surface of a linear conductor (1, 3, 5, 24) of metal and a portion of the compound thereof dipped in liquid (12) is in a superconductive state at liquid level measurement.
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