| 摘要 |
PURPOSE:To detect the minute magnetic body in the powder around a reactance, by providing two sets of series connectors each consisting of a reactance element and a resistor element, and comparing and detecting the change in the transition current of the reactance in synchronous relation to the application of DC voltage. CONSTITUTION:Series connectors LR1, LR2 consisting of reactances 12, 14 and resistor elements 13, 15 are provided and one reactance 7 is received in a powder storing container 5. A B-signal, which is inputted to a condenser 17 and a voltage comparator 11 and reversed, is inputted to the series connectors LR1, LR2 by the output A of an oscillator. Voltages C, E at the connecting points of the series connectors are compared by a voltage comparator 16 to obtain an F-signal which is, in turn, held by a synchronous signal G from a signal hold circuit 21 to obtain a detection signal H. This detection signal H comes to a high level when the powder 6 has a level shown by the numeral 9 and the level height of the powder to the reactance can be judged. |
