| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a liquid level detecting device can accurately detect a liquid level of viscous liquid, using a simple constitution. Ž<P>SOLUTION: The liquid level detecting device, detecting a liquid level of a carrier liquid (fluid) housed in a carrier tank (vessel) CY, includes a compressor (injecting means) 38 blowing a gas to a liquid level of carrier liquid, from above at an predetermined incident angle and a piezo-electric element (pressure detecting means) 39 detecting a pressure change due to gas flow generating by air (gas) reflected at the liquid level of the carrier liquid. A controller (determining means) 41 is also provided that determines such that the liquid level of the carrier liquid is at a predetermined position, when the voltage output value of the piezo-electric element 39 is not smaller than the threshold. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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