Fundamentals of Humidity Measurement Training Set


The measurement of air humidity plays an important role in many branches of industry, e.g., during drying or in the air conditioning of buildings and vehicles. There are different measuring methods to determine humidity.

The trainer TE 102 enables the measurement of air humidity with four different instruments which can be directly compared to each other: two different hygrometers, a capacitive hygrometer and a psychrometer. Psychrometers operate based on the principle of evaporation cooling and compare the ambient temperature with the wet bulb temperature to determine the humidity. Hygrometers utilize the property of specific fibers, e.g., hair, to expand with increasing air humidity. In the capacitive sensor the electricity constant of a layer and with it its capacity changes due to the water molecules absorbed. The core element of the trainer is a climatic chamber with transparent door.

This chamber can be humidified and dehumidified and contains the four instruments. A Peltier cooling element is used for dehumidification. An ultrasonic atomizer is used for humidification. To circulate the air and ensure good mixing a fan is used.


  1. Different measuring methods for measuring humidity
  2. Climatic chamber with adjustable humidity and transparent door
  3. Humidification via ultrasonic atomizer
  4. Dehumidification via Peltier cooling element
  5. Fan for air recirculation
  6. 2 mechanical instruments: psychrometer, hair hygrometer
  7. 2 electronic instruments: capacitive sensor, hygrometer with synthetic fiber and combined temperature sensor

Technical Details

  1. Humidifier
  2. Ultrasonic atomizer
  3. Power consumption: 21,6W
  4. Low water cut-off
  5. Dehumidifier
  6. Peltier element
  7. Cooling capacity: 56,6W (50°C ambient temperature)
  8. Cooling surface: 1600mm2
  9. Hair hygrometer with deflective needle
  10. Measuring range: 0…100% r. h.
  11. Hygrometer with synthetic fiber
  12. Output voltage: 0…10V
  13. Measuring ranges: 0…100% r. h. / -30…80°C
  14. Capacitive sensor with digital display
  15. Output voltage: 0…10V
  16. Measuring range: 1…100% r. h.
  17. Psychrometer with thermometer
  18. Measuring range: -10…60°C, graduation: 0,5°C
  • 230V, 50Hz, 1 phase
  • 120V, 60Hz, 1 phase; 230V, 60Hz, 1 phase