There are, essentially, two phenomena which can make it difficult to measure traces of moisture : Normal ambient air has a high moisture content up to about 10 000 ppm. Minute leaks in the piping system or tubing can thus lead to incorrect value measurements. Arising from its molecular structure, water is highly polarised, causing a strong inclination or affinity to be adsorbed. In general principle, every measurement is associated with some inaccuracies. In order to reduce these inaccuracies to a minimum, special precautions have to be observed when aiming at accurate humidity measurement.
