DY pressure sensor calibration training platform

1. Experimental purpose

(1) Master the methods and equipment usage of pressure sensor characteristic calibration; 

(2) Understand the dynamic response characteristics of different pressure sensors; 

(3) Analyze the dynamic pressure response characteristics of various pressure sensors; 

(4) Master the application of basic signal processing techniques.

2. According to standards

1. GB/T1526-1989 "Documentation symbols and conventions for information processing data flow charts, program flow charts, system flow charts, program network diagrams, and system resource diagrams";

2. GB/T8567-1988 "Guidelines for Preparation of Computer Software Product Development Documents";

3. GB50171-92 " Construction and Acceptance Specifications for Panels, Cabinets and Secondary Circuit Connections of Electrical Installation Projects";

4. ZB/N04009-88 "General Technical Conditions for Industrial Automation Instrument Panels".

3. Experimental principles    

Sensor calibration is to establish the relationship between sensor input and output through experiments, and also to determine the error relationship under different usage conditions.

Static calibration: Use piston static pressure calibration equipment to simultaneously verify the static and dynamic characteristics of industrial remote pressure gauges and pressure sensors installed in the same pressure chamber. Dynamic pressure measurement: Use a pressure wave generating device to generate alternating pressure signals. The above pressure sensors are used to simultaneously measure this pressure signal. The output of each pressure sensor is collected and analyzed by a computer, and its characteristic indicators are obt*ned through a series of calibration curves.

4. Measurement and control projects

The experimental device m*nly consists of a steady-state pressure wave generating device, an industrial remote pressure gauge, a low response frequency pressure sensor, a high-frequency pressure sensor, a switching power supply, a data acquisition board, a computer and pipelines. The system structure diagram is shown in the figure. 1 shown.

For the static and dynamic calibration of each pressure sensor, the system uses a self-made pipeline system to connect the pressure wave generating device, and installs industrial remote pressure gauges, dynamic response pressure sensors and other devices on the pipeline. When performing static calibration, close the stop valves f and c, open the rem*ning stop valves, and use weights to calibrate the industrial remote pressure gauge and dynamic response pressure sensor respectively; when performing dynamic calibration, close the stop valves a and c , open the rem*ning stop valves, and the pressure wave generating device generates alternating pressure signals to the pipeline system. During static and dynamic calibration, the steady-state or alternating pressure signals are detected by various sensors such as industrial remote pressure gauges and dynamic response pressure sensors installed on them, and the signals are converted into standard industrial signals or 485 signals. Passed to the data acquisition board, the computer collects the converted signals of each sensor of the board in real time, and uses independently developed host computer software to perform data analysis and processing on the collected pressure signals to obt*n the steady state and Alternate pressure and realize static and dynamic calibration of each pressure sensor.

5. Test bench function

1. The data collection inspection cycle can be automatically set by the user. The minimum cycle is refreshed every 10 seconds, and the maximum cycle is refreshed every 1 minute.

2. The computer can display the pressure data of each point online and draw the change curve of these data corresponding to time online.

3. The test results can be previewed on the computer, and the relevant parameters can be automatically stored in the database after confirmation.

4. Test records or results can be retrieved and printed from the computer by file name or experiment number.

5. Online calibration of each pressure sensor.

6. Characteristics of test bench

1. Simple structure and easy installation;

2. The testing process is intuitive, fast, accurate and convenient;

3. The system uses a high-precision pressure transmitter, which only needs to be adjusted to zero before the experiment. Frequent zero adjustment is not required during the experiment. The measurement of pressure value is converted into a standard signal, which improves the measurement accuracy and reliability of the system.

4. Using ADuC812 as the core data acquisition board improves the reliability of the system.

5. The measurement and control software adopts C# multi-threaded programming technology to improve the real-time performance of the system. At the same time, ActiveX virtual instrument control is introduced to form a measurement and control interface with Windows operating style and virtual instruments.

7. Technical parameters

1. Detection pressure range: 0.6MPa

2. Pressure sensor accuracy: 1%FS

3. Pressure sensor working medium temperature: -40℃～+125℃

4. Pressure gauge accuracy: level 1.6

5. Output signal: 4～20mA

6. Pressure wave generating device pressure ≤0.25MPa

7.  Motor power: 0.55kW

8. Communication method: RS232/485

8. Configuration

Steady-state pressure wave generation device, industrial remote pressure gauge, dynamic response pressure sensor, computer, acquisition control box, experimental software (Windows environment, using visual interface, virtual instrument method, the acquisition control process is completed by the computer, to achieve numerical Display and drawing are performed simultaneously, providing the Excel interface of Offices, and data can be stored, printed, and processed at any time to form a test report in Excel file format).

Hot-selling product: Electrician tr*ning bench