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.

A Peltier cooling element is used for dehumidification. An ultrasonic atomiser is used for humidification. To circulate the air and ensure good mixing a fan is used. 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. 

The trainer 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 utilise the property of specific fibres, e.g. hair, to expand with increasing air humidity. In the capacitive sensor the di electricity constant of a layer and with it its capacity changes due to the water molecules absorbed.

Specification:

Dehumidification via Peltier cooling element

Fan for air recirculation

2 mechanical instruments: psychrometer, hair hygrometer

Different measuring methods for measuring humidity

Climatic chamber with adjustable humidity and transparent door

Humidification via ultrasonic atomiser

2 electronic instruments: capacitive sensor, hygrometer with synthetic fibre and combined temperature sensor.

Technical data

Humidifier

Ultrasonic atomiser

Power consumption: 21,6W

Low water cut-off

Dehumidifier

Peltier element

Cooling capacity: 56,6W (50°C ambient temperature)

Cooling surface: 1600mm2

Hair hygrometer with deflective needle

measuring range: 0…100% r. h.

Hygrometer with synthetic fibre

Output voltage: 0…10V

Measuring ranges: 0…100% r. h. / -30…80°C

Capacitive sensor with digital display

Output voltage: 0…10V

Measuring range: 1…100% r. h.

Psychrometer with thermometer

Measuring range: -10…60°C, graduation: 0,5°C

230V, 50Hz, 1 phase

120V, 60Hz, 1 phase; 230V, 60Hz, 1 phase

Dimensions and weight

LxWxH: 1400x800x1630mm

Weight: approx. 110kg.