Abstract: A method for determining the relative humidity of gaseous materials, preferably for determining the relative humidity of air in rooms, such as greenhouses, whereby, using psychrometric moisture measurement, the temperature of the stream of gas, the relative humidity of which is to be measured, is determined by means of temperature sensors. A gas stream acting upon a moistenable wet temperature sensor is cooled up to a cooling limit (wet-bulb point) and the wet bulb point temperature is determined. The relative humidity is ascertained using the measured temperature of the gas and the wet-bulb temperature.

Abstract: A method and an apparatus for the detection of corrosion, pitting or the like in pipelines is proposed and measured results produced in an appropriate manner are digitally converted, linked with measured values concerning the place and azimuth of the individual sensors to form individual blocks, which are intermediately stored to form larger units and are finally stored in a mass store.