Order Code - 32383 Humidity Measure Methods Apparatus

Features
Different measuring methods for measuring humidity
Climatic chamber with adjustable humidity and transparent do

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.
Humidity Measurement Methods Apparatus 32383 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 dielectricity 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 atomiser is used for humidification. To circulate the air and ensure good mixing a fan is used.

Specifications
Different measuring methods for measuring humidity
Climatic chamber with adjustable humidity and transparent door
Humidification via ultrasonic atomiser
Dehumidification via Peltier cooling element
Fan for air recirculation
2 mechanical instruments: psychrometer, hair hygrometer
2 electronic instruments: capacitive sensor, hygrometer with synthetic fibre and combined temperature sensor

Technical Specifications
Humidifier
Ultrasonic atomiser
Power consumption: 21, 6W
Low water cut-off
Dehumidifier
Peltier element
Cooling capacity: 56,6W (50oC 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..
Capacitive sensor with digital display
Output voltage: 0...10V
Measuring range: 1...100% r. h.
Psychrometer with thermometer
Measuring range: -10...60oC, graduation: 0,5oC

Experiments
Measuring methods for air humidity measuremenU
Psychrometric humidity measurement
Hygrometric humidity measurement
Capacitive humidity measurement
Characteristic variables to describe air humidity
Changes of the state of humid air in the h-x diagram
Determination of the relative air humidity with psychrometer
Hair hygrometer
Hygrometer with synthetic fibre
Capacitive humidity sensor
Design and operation of the instruments
Comparison of the instruments

Requirements
Mains Power 220- 240V @ 50Hz, IPh