Description

Designed to study the theoretical foundations and principles of measuring temperature and humidity, studying thermoelectric phenomena, becoming familiar with various types of sensors and instruments for measuring and controlling temperature and humidity.
Can be used for laboratory work in the courses “Thermal Measurements”, “Measuring Converters”, “Physical Basis of Obtaining Information”, “Measurement and Accounting of Energy Carriers”.
Compound:
1. Temperature calibrator with operating temperature from 50 to 250°C (mini-oven) with microprocessor meter/regulator.
2. Temperature calibrator with an operating temperature from -5 to 10°C (mini-refrigerator based on Peltier elements) with a microprocessor meter/regulator.
3. Surface temperature calibrator with operating temperature from 50 to 150°C, with microprocessor meter/controller for non-contact temperature measurements.
4. Set of temperature sensors: chromel-kopel thermocouple THK, chromel-alumel thermocouple TXA, copper resistance thermometer TSM, platinum resistance thermometer TSP — 2 pcs.
5. Precision two-channel temperature, resistance, voltage meter.
6. Infrared pyrometer.
7. Glass thermometer (scale 1 °C).
8. Multimeter with thermocouple.
9. Humidity calibrators (75% and 33%).
10. Boxing with variable humidity.
11. Psychrometric hygrometer.
12. Capacitive humidity sensor
13. PC with a pre-installed operating system and specialized software
14. Stand operation manual.
15. Recommendations for conducting laboratory work.
• Study of thermoelectric phenomena: Seebeck (thermo-emf), Peltier, Thompson. Study of the dependence of the amount of Peltier heat on the strength and direction of the supplied current, calculation of the Peltier coefficient from experimental data.
• Study of methods (contact and non-contact) of temperature measurement.
• Study of characteristics of thermoelectric converter:
— Removing the nominal static characteristics of the thermoelectric converter.
— Determination of the thermal inertia index of the thermoelectric converter.
— Determination of the influence of the free junction temperature on the static characteristics of the thermoelectric converter.
— Study of automatic correction of cold junction temperature.
• Study of thermal resistance characteristics:
— Removing the static characteristics of the resistance thermometer.
— Determination of thermal inertia of a resistance thermometer.
— Removing the calibration characteristic of the resistance thermometer.
— Determination of the influence of resistance of a two-wire line.
• Humidity measurement methods:
— Relative humidity measurement using psychrometric effect;
— Measuring relative humidity using a capacitive sensor by changing the dielectric constant of the medium when the humidity changes.