| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that there is no sealed type simple level gage equipment for monitoring and controlling a liquid level of a high temperature oil tank and the like in the prior art. SOLUTION: A simple, convenient, highly precise and highly reliable liquid level sensor resistant against an environment is composed of a float 4 for measuring the liquid level, a pulley part 5 and a counter weight 6 for winding the float up, and a pulley 8 connected to the counter weight 6, by blocking an air flow between the former part and the latter part.
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