During the detection process, the oxygen nitrogen hydrogen analyzer may experience malfunctions such as exceeding the blank values of oxygen and nitrogen, inability to start or operate abnormally, and deviation in detection results. Targeted measures should be taken by adjusting the airflow parameters, checking the power supply and connections, calibrating the instrument, or replacing components. The following are diagnosis and troubleshooting solutions for common faults:
1、 Oxygen and nitrogen blank values exceed 20
Reason for malfunction: The airflow is too small to effectively drive away the air in the furnace, resulting in abnormal detection results.
Diagnostic method: Observe the flow meter reading and confirm whether the carrier gas pressure is within the range of 0.2-0.4MPa.
Exclusion plan:
Adjust the gas flow rate to ensure that the carrier gas pressure is stable at 0.2-0.4 MPa.
Connect the instrument carrier gas, place the graphite crucible on the lower electrode, turn on the main power switch, click the furnace shutdown button on the software, turn off the furnace and wait for 10 seconds.
Adjust the flow regulator until flow meter a shows 30L/h, then turn on the furnace; Adjust the regulator again until flow meter b shows 50L/h, then turn off the furnace again.
If the setting is unstable, increase the flow rate to 100L/h and adjust repeatedly until the instrument stabilizes.
2、 The instrument cannot start or operate normally
Reason for malfunction: It may include unstable power connection, poor cable connection, or internal malfunction of the instrument.
Diagnostic method: Check if the power indicator light is on and confirm if the cable connection is secure.
Exclusion plan:
Ensure stable power connection and normal power supply.
Check the cable connection to ensure there is no looseness or damage.
Restart the instrument and observe if it returns to normal operation.
3、 The display screen does not light up or displays abnormally
Reason for malfunction: Insufficient power supply, loose display screen connection cable, or display screen malfunction.
Diagnostic method: Check the power indicator light and confirm if the display screen connection cable is securely plugged in.
Exclusion plan:
Ensure sufficient power supply and stable voltage.
Check the connection wires of the display screen to ensure they are not loose or damaged.
Restart the instrument and observe if the display screen returns to normal.
4、 The test results do not match expectations
Reason for malfunction: incorrect standard curve or calibration parameter settings, improper sample processing, or inaccurate instrument calibration.
Diagnostic method: Check the standard curve and calibration parameters to confirm whether the sample processing process meets the requirements.
Exclusion plan:
Confirm whether the standard curve or calibration parameters are set correctly.
If the calibration parameters are correct, try replacing with fresh standard substances for recalibration.
Regularly calibrate and validate instruments to ensure the accuracy of measurement results.
5、 The software cannot be opened or crashes abnormally
Reason for malfunction: outdated software version, system conflict, or software file damage.
Diagnostic method: Try restarting the software and observe if it returns to normal.
Exclusion plan:
Reinstall the software or update to the latest version.
Check system compatibility to ensure that the software matches the operating system.
If the problem persists, contact the software supplier or technical support team for assistance.
6、 Sample inlet blockage
Reason for malfunction: Improper sample processing resulted in impurities blocking the injection port.
Diagnostic method: Observe whether there are foreign objects blocking the injection port and try to clean it with a cleaning tool.
Exclusion plan:
Clean the injection port to ensure there are no impurities blocking it.
Check the sample processing process to ensure good quality of the sample filtrate.
Regularly maintain and upkeep the injection port to prevent blockage.
7、 The instrument channel voltage is abnormal
Reason for malfunction: Empty gas cylinder, air entering the analyzer or thermal conductivity cell malfunction.
Diagnostic method: Check the pressure of the gas cylinder and observe the voltage reading of the thermal conductivity cell.
Exclusion plan:
Check the pressure of the gas cylinder to ensure sufficient air supply.
If the gas cylinder is empty, replace it promptly.
Check the voltage of the thermal conductivity cell. If the voltage is less than -6V, it may be due to air entering the thermal conductivity cell. Open the door on the right and block the gas inlet of the furnace. Observe the voltage change after 10 seconds.
If the voltage is still abnormal, it may be a fault in the thermal conductivity pool, and professional maintenance personnel should be contacted for repair.