METHOD FOR DETECTING MIXED AIR IN HERMETIC CONTAINER

PURPOSE:To detect with high accuracy whether mixed air exists in a hermetic container or not, by allowing the detecting part of the hermetic container to be opposed to the detecting surface of an electrostatic capacity sensor and detecting a variation of a capacitance. CONSTITUTION:A normal cartridge 1 having no mixed air is installed to a supporting base 4, and in a state that the detecting surface 5a of a sensor 5 is abutting on the bottom face 3a of a plunger part, a regulator 7a is adjusted so that a display part 9 executes a display of 'no air'. Thereafter, the cartridge 1 for executing an inspection is installed to the supporting base 4, and by the sensor 5, the electrostatic capacity is detected. When mixed air exists in the cartridge 1, the influence exerted on the oscillating circuit of the sensor 5 is reduced, therefore, the circuit 7 does not reach the stop of an oscillating condition, and the display part 9 displays that mixed air exists, and also, raises an alarm sound.