Dual channel thermal desorption instrumentPlays an important role in volatile organic compounds (VOCs) analysis, but may encounter some malfunctions and problems during use. Here are some common troubleshooting and solutions:

1、 Air connection issue

Phenomenon: Poor gas path connection of the dual channel thermal desorption instrument may cause air leakage or equipment malfunction.

resolvent:

Before use, carefully check the air circuit connection to ensure there is no air leakage.

If air leakage is found, the joint should be tightened or the damaged air pipe should be replaced.

2、 Temperature control issues

Phenomenon: Temperature control directly affects desorption efficiency and the accuracy of analysis results. Improper temperature setting may result in failure to desorb the sample.

resolvent:

Regularly calibrate the temperature control system to ensure uniform and stable temperature in each heating area.

Before operation, the appropriate analysis temperature and desorption temperature should be set according to the instructions.

3、 Sample cross infection issue

Phenomenon: When handling multiple samples, cross infection may occur between different samples, affecting the test results.

resolvent:

After each use, the sample transfer tube and injection valve should be backwashed and cleaned to prevent residue from interfering with the analysis of the next sample.

Regularly clean and replace components that may come into contact with the sample.

4、 System self-test issue

Phenomenon:Dual channel thermal desorption instrumentIt usually has a system self-test function, but sometimes there may be false alarms or missed alarms.

resolvent:

Firstly, confirm whether all components during the self inspection process are working properly, and repair them promptly if there are any issues.

For frequent false alarms, you can consider upgrading the system software or contacting the manufacturer's technical support.

5、 Equipment maintenance issues

Phenomenon: Long term use of equipment without proper maintenance may lead to performance degradation or frequent malfunctions.

resolvent:

Establish equipment maintenance plan, regularly inspect and maintain key components such as electric control valves, sensors, etc.

Keep the equipment clean and avoid prolonged exposure to corrosive gases or humid environments.

6、 Abnormal control board buttons

Phenomenon: The control panel buttons of the thermal desorption instrument may have abnormalities, such as the instrument not starting, abnormal LCD screen display, and abnormal control panel buttons.

resolvent:

When the instrument cannot be started, check whether the power socket is secure, whether the fuse is intact, and whether the circuit is unobstructed.

When the LCD screen display is abnormal, unplug the five wire plug of the circuit board again or adjust the potentiometer of the display board circuit board.

When the control panel buttons are abnormal, replace the button film with a new one or check if there is any loose connection in the wiring.

7、 Small or no injection peak

Phenomenon: During the detection process, there may be situations where the injection peak is small or there is no injection peak.

resolvent:

Check if there is any air leakage at the connections of each airway, replace the sealing gasket or re tighten the nut at the leakage point.

Ensure correct loading and transportation of samples to avoid sample loss or contamination.

　　Dual channel thermal desorption instrumentDuring use, various problems may be encountered, but through careful inspection, regular maintenance, and correct operation, faults can be effectively eliminated and the normal operation of the equipment can be ensured. If encountering difficult to solve problems, it is recommended to promptly contact the manufacturer's technical support or professional maintenance personnel for handling.