The paramagnetic oxygen analyzer utilizes the physical property of oxygen's paramagnetism to distinguish it from most gases. Two glass balls filled with nitrogen gas (commonly known as "dumbbells") are installed between the two magnets in the paramagnetic oxygen chamber, and they are fixed on a rotatable coaxial bracket. The oxygen in the measured gas will be drawn into the magnetic field, generating a force on the sphere and thus producing a torque on the axis of rotation. The magnitude of this torque is linearly related to the oxygen content.