Adsortpion takes place if gases are held solely by the surface forces when they come into contact with a solid substance, e.g. the inside wall of a hose. These "captured gases are then given off again uncrolledly (e.g. the presence of NO2 ls indicated even though no more NO2 gas is applied).
To adjust the measured reading to the smallest possible deviation according to the known standard value or reference (i.e. for analyzer calibration gas). Therefore, adjustment requires a change of the instrument settings.
Standard deviation of a series of measured values from measurements performed at short intervals of time and carried out according to a defined measurement procedure by the same operator on the same parts, using the same equipment and at the same place.
Period of time the sensor/unit needs in order to react to the introduced concentration with a stable signal/indication. In practice, txy times are given, e.g. T90 time. This is the length of time until 90% of the introduced concentration is displayed.