Abstract: A gas-friction vacuum meter has, in addition to the magnetic system for contactlessly suspending the gas sensor, a device for measuring the actual inclination of the rotation axis of that sensor and corrects the measured value for the inclination by comparison of the output signal of this device with an Eddy-current conditioned braking value obtained for a certain inclination angle of the rotation axis.

Abstract: For measurement of gas pressure a gas-friction vacuum meter is used in whose measuring head a rotating body is suspended in a magnetic field contact-free between electromagnetic drive coils. The rotating body is set in motion with the aid of the drive coils and maintained at a rotational speed above a preset minimum rotational speed. The speed reduction of the rotating body occurring on account of gas friction is continually or intermittently balanced with current flows from a three-phase generator to the drive coils. In the measuring head rotational speed sensors are arranged and positioned, which detect and respond to the rotational frequency of the rotating body, and further transmit output signals to an electronic analyzer unit, which determines the pressure from the timely change of the rotation frequency.