JPS6447913A - Level detecting apparatus - Google Patents

Abstract

PURPOSE:To simplify handling and operation and to make it possible to perform stable, highly accurate measurement without personal differences, by immersing a fixed electrode into water in a water tank, bringing the probe of a movable electrode into contact with the water surface, conducting a current, and detecting the water level. CONSTITUTION:A plate 4 is mounted on an upper opening part 1b of a water tanks 1. A fixed electrode 5 is suspended from the plate 4 so that the electrode 5 is immersed in water in the water tank. A movable electrode 6 is coupled into the plate 4 so that the electrode can be moved up and down freely. A probe 6a of the electrode 6 can be brought into contact with a water surface 0 in the water tank. Electric charge is applied between the electrodes 5 and 6 beforehand. When the probe 6a is brought into contact with the water surface 0, a current is conducted. Thus a level is detected. The contact between the probe 6a and the water surface 0 is not used as a visual reference. The water surface is detected by detecting the resistance of the water when the probe 6a is brought into contact with the water surface 0. The value of a digital scale at this time is displayed on a digital scale counter 13. The digital display is kept for a specified time with a timer circuit 12, and highly accurate, stable level measurement is performed. Therefore, even an unskilled person can measure the level of a bench mark Wa freely.