as already seen in part 3, the choice of the right measuring instrument is very important for achieving the best humidity measurement results.
Calibration times and traceability standards should also be regularly maintained. Products manufactured in cleanrooms or in laboratories, production facilities, warehouses...cover a wide range, including pharmaceuticals, semi-conductors and food products....
Humidity and temperature are often monitored, as these parameters can have serious effects on product quality and production efficiency.
Sensors 1-6 can measure general humidity levels
Sensors 5 and 6 are also used to measure low dew point.
The principle behind each technology is briefly described below.
1. A psychrometer is a simple form of hygrometer, consisting of two thermometers.
One is a dry bulb and the other a bulb that is kept wet to measure the wet bulb temperature.
The wet bulb is cooled by water evaporation. The amount of evaporation, as well as the cooling of the thermometer, depends on the humidity of the atmosphere. This data, together with humidity tables or calculations, is used to determine the water vapour pressure in the ambient air, and the relative humidity. This method is often used in humidity and temperature laboratories and test chambers.
2. measures and records humidity: this is an instrument with a sensor that expands and contracts with changes in humidity, such as human hair. This type of measurement has been used for a long time. The accuracy of the method is not very good.
