Different physical processes are used to measure temperatures. Temperatures can be read off directly on a scale, e.g. by the expansion of a measuring medium. In industry, temperatures are often measured electronically. The advantage of electronic measurement is that further processing or transmission of signals to remote locations (controllers, external displays) is easier.
The trainer can be used to carry out and compare different temperature measurement procedures. The trainer includes liquid thermometers, bimetal thermometers, as well as a thermocouple,a Pt100 resistance thermometer and an NTC thermistor, each with different protective sleeves, for electronic temperature measurement. A psychrometer with two liquid thermometers is used to measure the relative air humidity.
Learning Objectives/Experiments
Familiarisation with different temperature measurement methods:
Non-electrical methods: liquid thermometers, bimetal thermometers
Electronic methods: thermocouple, Pt100 resistance thermometer, NTC thermistor
Determination of air humidity with a psychrometer
Familiarisation with the function of the individual temperature measuring instruments
Response behaviour of the sensors
Steady and transient behaviour
Specification
Steady and transient temperature measurement with typical measurement instruments
Temperature sensors: liquid thermometer, bimetal thermometer, Pt100, thermistor (NTC), type K thermocouple
Psychrometer for determining the relative air humidity
Defined temperature jumps up to 80°C
Experimental tank and heating tank with temperature control, water-filled
Both tanks equipped with stirring machine
Fan generates constant air temperature above the experimental tank
3-channel line recorder for recording the measured values
Technical Data
Heater
output: 2kW at 230V, 1,5kW at 120V
tank capacity: 4L
Temperature controller
PID
Line recorder
3 channels
serial interface
Temperature sensors
liquid thermometer with organic liquid
bimetal thermometer
psychrometer
thermocouple type K
thermistor (NTC)
Pt100
Measuring ranges
temperature: 0…100°C
rel. humidity: 3…96%
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
