as already seen in section 5, 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.
Widely used, it measures humidity by detecting changes in the capacitance of a thin polymer film (a capacitor).
This type of sensor can easily achieve sufficient accuracy, and is mainly used in industry. Many suppliers worldwide use this technology, which is inexpensive and highly cost-effective in terms of accuracy and long-term stability.
The principle of this technology is essentially based on the dew point temperature at which air containing water vapor is cooled.
A mirror is cooled until it reaches the dew point of the gas in question. As a form of dew condensation, this changes the light reflected by the mirror. When the mirror surface reaches a state of equilibrium in which evaporation and condensation occur at the same rate, the mirror temperature is equal to the dew point temperature of the gas under test.
This type of sensor is often used in research institutes.
