| 摘要 |
PURPOSE:To automatically control the pressure in a proportional counter tube at a constant variation by operating an exhaust or suction solenoid valve by way of an electric power discriminator by the voltage detecting the pressure in the proportional counter tube when said pressure rises or drops by exceeding a predetermined range. CONSTITUTION:When the internal pressure of a proportional counter tube 4 is wintin a normal pressure range, the detection voltage attenuating 7 the output of a pressure sensor 5 is between the respective discrimination voltages E1 and E2 of electric power discriminators 11, 12, and does not output the control signal from the discriminators 11, 12, hence solenoid valves 3, 6 are not operated. Next, when the internal pressure of the pipe 4 rises and exceeds a normal pressure range, the detection voltage rises higher than the discrimination voltage E1, and the discriminator 11 outputs a control signal, thereby ON controlling the exhaust solenoid valve 6. Similarly, when the internal pressure of the tube 4 drops, the suction solenoid valve 3 is ON controlled by the control signal from the discriminator 12. Thereby, the pressure in the tube 4 is automatically controlled at a fixed variation. |
