Abstract: A circuit arrangement is suggested for monitoring the air volume in vehicle tires which effects the most accurate possible correction of the temperature measured by a sensor fastened at the wheel to the actual air temperature in the tire. For this purpose, the temperature and pressure measurement value of the tire measured by the rotating sensor (13) of the wheel to be monitored is fed to a correction circuit (18) which is also receives a plurality of correction parameters (p, F, K, v). A corrected value for the temperature (t.sub.k) or for the air pressure in the tire is transmitted at the output of the correction circuit (18) as a function of the correction parameters (FIG. 1).

Abstract: A sensor for determining the pressure and temperature of the air in a vehicle tire and comprising temperature sensor elements decoupled from the temperature of the wheel rim and coupled to the temperature of the tire air. The temperature sensor elements are arranged on an insulating foil which is stretched over one of the openings of a cover cap which is fastened at the sensor housing so as to be thermally insulated. The temperature sensor elements are connected with connecting leads of the electronic circuit of the sensor via conductor paths of the insulating foil.

Abstract: A pressure probe is suggested which serves to determine the air pressure in the interior of tubeless tires on motor vehicle wheels comprising a rim. The pressure probe (10) carries a substrate (26) in a front recess (31) of the probe housing (14) facing the tire interior, at least one sensing element (24) being arranged at the substrate (26) in the outer area on the side remote of the tire interior. In order to keep the air in the vehcile tire at a distance from the sensing elements (24) on the one hand, but transmit the air pressure to the latter without falsification on the other hand, a circumferentially extending cut out portion (36) in the housing area below the sensing elements (34) is filled with a non-conducting magnetic fluid (37), a permanent magnet (39) being arranged at the base (38) of the cut out portion (36), which permanent magnet (39) secures the magnetic fluid (37) for the purpose of covering the sensing elements (24) so as to be free of stresses (FIGURE).