A circuit, in which the resistance and the reed s/w is serially connected in intervals of 1-2cm, is installed inside the pipe. When the float, equipped with the magnet, moves up and down the pipe by buoyancy, the reed s/w is cut short, and the total resistance value changes until the cutting is summed. The resistance value that had changed based on the level of the fluid is transformed into an electric current signal DC 4-20mA, and put out. This is the most general level control and instruction device
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