When speaking of humidity, one normally is referring to relative humidity (RH), as opposed to an absolute value. Absolute humidity is used when dealing with the moisture content of materials. One can also refer to moisture in material, such as moisture in oil. When the ambient air or gas is quite dry and the measurement of humidity is difficult, then one refers to dew point, the temperature at which condensation would occur, or frost point when freezing would occur.
Nonetheless, relative humidity is the most important parameter measured, for example:
• when human comfort or performance is relevant
• when responses to changes in conditions are needed, in the monitoring and control of industrial processes
• when humidity needs to be monitored in controlled environments; e.g. in storage facilities, to keep products such as paper, food, pharmaceuticals, tobacco and textiles dry, or at a specific humidity level.
Humidity Measurement Training Seminar
Vaisala offers humidity seminars in the USA. If you would like to participate, please register here.
The Humidity Training Seminar presentation
video can be watched here. It has been divided in to 6 parts. Click on the links below to run the videos:
- Part 1, Humidity Theory, Terms & Definitions
- Part 2, Practical Psychometry
- Part 3, Humidity Sensor Technology
- Part 4, Selecting a Hygrometer
- Part 5, Good Measurement Practice
- Part 6, Calibration
