Water level measuring instrument

Abstract

Abstract PURPOSE:To measure the water level with a high accuracy by constituting a water level measuring instrument with a float which rises and falls in accor dance with the variation of the water level, a pulse generator which generates pulses having positive and negative polarities in accordance with this rise and fall of the float, and an up/down counter and converting the counter output to an electric signal through a converter. CONSTITUTION:A float 1 is floated on the surface of water filled in a water tank 11, and a pulse generator 20 which generates a positive or negative-polarity pulse signal 21 in accordanc with the rise or fall of the float 1 is rotated, and the generated pulse signal 21 is inputted to a water level oscillator 13. This oscillator 13 consists of a pulse counter 30, whch up-counts the signal 21 if it has the positive polarity and down-counts it if it has the negative polarity, and a converter 40 whose range is switched to 0-5m and 0-20m by an external signal 50. A unified electric signal 10 outputted from the oscillator 13 is converted to DC 4-20mA and is displayed on a display device omitted in the figure. Thus, the correct water level is obtained with one measuring instrument to reduce the cost of equipment.

Inventors

• 👤 Toshihiro Nakajima
• 👤 敏博 中島

Bibliographic Details