| 摘要 |
PURPOSE:To elevate an accuracy by maintaining the switching of ON or OFF in order of an optical circuit between a light source and plural received light transmitting path means by a sectorial shielding plate, in accordance with the movement of a float in order in a height direction over the prearranged places. CONSTITUTION:A float supporting part 26 is divided into two branches and one end side of a rotary shaft 27 which penetrates both sides is fixed to a float supporting lever 25 via a float assisting frame 28. As the amount of liquid is increased then a shielding plate 29 starts to rotate to right according to the rise of a float 24 and the clockwise rotation of the rotary shaft 27 and a light receiving cable is released from the interposition of the shielding plate in a space from those connected to an empty indicating part at the left end, and an optical path is closed, and when a tank is filled up in due time and the float is lifted up, the shielding plate 29 is completely released from the space 22 and closes the optical path up to the light receiving cable of the right end corresponding to a fill-up indication F and the total indication parts of an indicator 8 are turned on. Since the detection of the height of a liquid surface can be correctly performed at the desired intervals by such an instrument, the accuracy is elevated. |
