Abstract: Paramagnetic gas analyzer comprising an electromagnet with an almost closed ferromagnetic circuit and a gap, including a measuring chamber with inlet and outlet lines for the gas to be analyzed as well as a gas of known magnetic susceptibility where devices are provided which measure the differential gas pressures in the respective lines by supplying an AC current to the electromagnetic. According to the present invention it is shown, how the power consumption can be considerably reduced. This object is achieved by superimposing a DC magnetic field generated by means of a permanent magnet onto the AC magnetic field. The amplitude of the measuring result depends on the product of the AC field and the DC field. If the DC field is strong enough, the AC field and thus the supplied power can be reduced accordingly. The latter also facilitates the filtering off of predetermined, undesirable signals.

Abstract: A capacitor transducer, for instance a condenser microphone, is so designed that the stationary electrode can be mounted relatively quickly and in a relatively simple manner in the microphone housing. The transducer is provided with an inner cylindrical supporting wall spaced from the inner surface of the transducer housing. One end of the supporting wall is fixedly connected to the transducer housing through a transverse wall while the other end is remote from the transverse wall and constitutes a seat for the insulating body. The supporting wall in the insulating body are so dimensioned that the body can be mounted into its seat either by a pressing action or by insertion and subsequent retention by means of frictional forces or by means of an adhesive.