| 摘要 |
<p>The appts. comprises a probe (1) attached to a flexible measuring tape (2) coiled in a support mounted at the top of the tank in which liquid level is to be measured. The probe (1) consists of an enclosure (100) containing a sensing element (200) which is a metallic wave guide with four sections. Mechanical vibrations at a predetermined frequency (fi) are initiated in the sensing element (200) by a transducer (201) driven by electronic circuits. The transducer detects changes in the pattern of reflected vibrations when the lower face (208) of the sensor makes contact with the surface of the liquid. <IMAGE></p> |
