The troubleshooting of organic carbon element carbon analyzer requires a combination of systematic thinking and practical experience. The following analysis is conducted from four aspects: hardware, gas circuit, detection system, and daily maintenance, and targeted solutions are provided:
1、 Combustion system malfunction and handling
-Combustion tube rupture
-Cause: Chemical corrosion of quartz tubes caused by high temperature and high pressure (such as reaction with salts/alkaline substances), or thermal stress rupture caused by sudden temperature changes.
-Solution: Control the combustion temperature to ≤ 950 ℃ and stabilize the pressure at 1.00MPa; Install silver wire to remove halogen elements and reduce corrosion; When shutting down, cool naturally to below 100 ℃ before turning off the power.
-Catalyst failure
-Phenomenon: Decreased oxidation efficiency and low measured values.
-Solution: Regularly clean the combustion tube (once a month) and replace the catalytic tube every 2 years; Soak and dissolve inorganic salt deposits in dilute hydrochloric acid to avoid mechanical scratching and damage to the pipe wall.
2、 Leakage and blockage of the pneumatic system
-Traffic abnormality alarm
-Leak detection method: Remove the oxygen injection port and measure whether the flow rate meets the standard; Apply soap bubble solution to the joint and observe the bubble to locate the leak point.
-Blockage removal: Check the working status of the solenoid valve step by step, and use the instrument's built-in leak detection function to track the direction of airflow; Perform ultrasonic cleaning on the pipeline or replace aged pump tubing.
-Increased back pressure
-Cause: Poor discharge of waste liquid or fatigue of peristaltic pump tubes.
-Solution: Adjust the pump speed to 20-40rpm and replace the pump tubing every 3 months; Clean the waste liquid bottle and drainage pipeline to ensure that the liquid level sensor is functioning properly.
3、 Sample injection and detection module issues
-Abnormal noise and return of the syringe
-Cause: Sensor displacement or mechanical wear.
-Calibration: Adjust the sensor position again and test whether the power on/off sound is normal.
-Baseline drift and noise interference
-Root cause: Insufficient purity of the carrier gas (containing organic/particulate matter), moisture or contamination of the detector.
-Solution: Replace high-purity carrier gas and install purification device; Soak the conductivity cell in 0.1mol/L hydrochloric acid, rinse with pure water, and dry and dehumidify the NDIR detector.
4、 Software and communication malfunction
-Data storage exception: Format storage card (FAT32 format), restore factory settings; Wipe the interface contacts with alcohol and replace the communication cable.
-Driver compatibility issue: Install the latest driver program provided by the manufacturer to avoid data collection interruptions caused by incompatible operating systems.
5、 Preventive maintenance strategy
-Graded maintenance system
-Daily inspection: Confirm the stability of the gas source pressure and check the lifespan of the UV lamp.
-Zhou maintenance: Clean the injection system and replace the peristaltic pump tube.
-Monthly calibration: Verify detector accuracy using standard solution and adjust gain parameters.
Through the above structured troubleshooting process, more than 80% of typical faults can be efficiently located. It is worth noting that about 60% of the measurement deviation is due to carrier gas pollution and catalyst aging [^ 4 ^]. It is recommended to establish a consumables replacement ledger and prioritize the use of original parts to reduce compatibility risks.