| 摘要 |
PURPOSE:To exactly display a level of a liquid, by providing plural electrodes in a suport vertically provided in a storage tank, connecting each electrode to a high frequency power source, constituting a level display of a detector, a decoder, an arithmetic device, etc., and connecting the detector to the storage tank. CONSTITUTION:A high frequency power source 13 is operated, and a current value is detected by detectors 14a-14c from the electrostatic capacity between electrodes 12a-12c and a storage tank 10. Since the distance between the bottom wall of the storage tank 10 and the electrodes 12a-12c is known already, a digital signal is outputted to an arithmetic device 19 from a decoder 18, is processed by the device 19, and thereafter, the digital signal is outputted to a level indicator 20 from the device 19, and a level l0 of a liquid is indicated roughly. Even if the conductivity of a fluid in the storage tank is varied, said signal is processed by the arithmetic device in accordance with a current value detected by the detector, the distance between the bottom side of the storage tank and the lower end of the electrode, and the length of the electrode, and is outputted to a level indicator, by which a level of a fluid can be indicated exactly. |
