DYRG-DZ Thermal resistor and thermocouple temperature sensor calibration training device
Release time：2024-06-13 19:00viewed：times
At present, the temperature is measured by indirect measurement. It uses the characteristics of some materials or components that change with temperature. By measuring the performance parameters, the measured temperature is obt*ned. The temperature characteristics are: thermal expansion, resistance, thermoelectric potential, magnetic permeability, dielectric constant, optical properties, elasticity, etc. of the material, among which the first three are particularly mature and widely used. Thermal resistors and thermocouple temperature sensors are simple in structure, easy to manufacture and have a wide temperature measurement range, so they are the most widely used. However, thermal resistors and thermocouples are affected by materials, temperature, wiring methods and other environmental factors, which affects the temperature measurement accuracy. For this reason, correction is required. This experimental table has a simple structure and reliable performance. It is suitable for students to conduct thermal experiments, and can also be used in scientific research and product quality inspection of manufacturers.
1. Functions of the experimental device
1. Calibrate and calibrate thermal resistors and thermocouple thermometers.
2. The thermal resistor wiring method can adopt two-wire, three-wire and four-wire thermal resistor wiring.
3. There are three types of thermocouples K, J, and T. The electromotive force can be measured manually by a potentiometer or automatically by a computer.
4. Multiple thermocouples or thermal resistors can be measured each time.
5. For the automatic test system, the data collected is automatically processed by the computer, and the measurement results can be displayed on multiple screens for automatic analysis.
II. Characteristics and technical indicators of the experimental device
1. Simple structure and easy installation;
2. It has manual and automatic test functions, and the test process is intuitive, fast, accurate and convenient;
3. The system uses a constant temperature water bath, the temperature fluctuation is less than ±0.5℃, and the temperature measurement range is 0-100℃.
4. For automatic testing, the data acquisition device uses a high-precision acquisition card.
5. Uncert*nty of the calibration result: Thermocouple: less than 0.7℃; Thermal resistor: less than 0.05℃
III. Experimental purpose
1. Understand the temperature measurement principle of thermal resistors and thermocouple thermometers
2. Learn the production and calibration methods of thermocouple thermometers
3. Understand the principle of temperature measurement of two-wire, three-wire and four-wire thermal resistors
4. Master the principle and use of potentiometers
5. Understand the principle of automatic data acquisition
6. Apply error analysis theory to the analysis of temperature measurement results.
4. Experimental composition
The thermocouple experimental device is m*nly composed of a constant temperature water bath, a potentiometer, a thermocouple, a thermal resistor, an ice point meter, a data acquisition device, a low potential conversion switch and a standard glass thermometer. The constant temperature water bath is equipped with stirring, heating and temperature control devices, which can stabilize the temperature near the set value as required. The temperature measured by the standard glass thermometer is used as the standard temperature for calibrating thermocouples and thermal resistors. Virtual simulation software for electrical installation of building buildings and intelligent buildings Based on the unity3d design, users can choose different sizes of interactive interfaces according to the computer configuration, and can choose six levels of image quality. The model in the software can be rotated 360°, enlarged, reduced, and translated. There are assistant prompts during the use of the software, as follows: A. Wet alarm system 1. System overview: Overview of wet alarm system 2. Equipment recognition: It has the best viewing angle, equipment det*ls (displaying the introduction or parameters of the equipment), exercises (built-in 6 multiple-choice questions, with prompts for correct and wrong choices), and schematics (you can enter the equipment from the schematics). Equipment includes: sprinkler, water flow indicator, signal butterfly valve, exhaust valve, fire alarm control, high pressure gauge, high-level water tank, Weiya control cabinet, pressure regulating tank, flow switch, terminal water test device, dr*nage facilities, water pump connector, hydraulic alarm, delay, wet alarm, butterfly valve, check valve, fire pump, safety pressure regulating valve, fire water pool. 3. Principle display: Display the working principle of the wet alarm system, 3D animation demonstration, 3D model is semi-transparent, and the internal water flow can be seen. Equipped with exercise module (4 built-in multiple-choice questions, both correct and wrong choices are prompted) 4. Design layout: There are multiple-choice questions and calculation questions, each question is scored, and the correct answer and score are displayed after submission B. Gas fire extinguishing system 1. System overview: Overview of gas fire extinguishing system 2. Equipment cognition: It is equipped with the best viewing angle, equipment det*ls (displaying the introduction or parameters of the equipment), exercises (8 built-in multiple-choice questions, both correct and wrong choices are prompted), and schematic diagram (you can enter the equipment from the schematic diagram). Equipment includes: nozzle, HFC-227 storage bottle, bottle head valve, HFC-227 one-way valve, high-pressure hose, gas one-way valve, safety valve, weighing alarm, electromagnetic starter, selector valve, smoke alarm, fire alarm controller. 3. Principle display: Demonstrate the working principle of the gas fire extinguishing system, 3D animation demonstration, 3D model is semi-transparent, and the internal gas can be seen. Equipped with practice module (3 built-in multiple-choice questions, with prompts for correct and wrong choices) 4. Design layout: There are 6 multiple-choice questions, each with scores, and the correct answer and score will be displayed after submission. C. Escape drill: Teaching in the form of fun games, escape from the burning room within a limited time, and wrong choices will directly enter the score interface.
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