E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

Routine maintenance of total organic carbon analyzer

by:BOQU     2023-04-13
As the requirements for water systems continue to become stricter, total organic carbon analyzers are more and more used in enterprise water systems. It is inevitable that some problems and failures will be encountered in use. Through daily communication with customers, we will The problems encountered and some daily maintenance of the total organic carbon analyzer will be sorted out according to the classification of high concentration and low concentration, hoping to help everyone. 1. The combustion tube is broken. During the sample analysis process using the total organic carbon analyzer, the combustion tube rupture is a relatively common failure. The main reasons for the rupture: 1) If the temperature and pressure of the combustion furnace are too high during use, it will cause rupture, so the temperature setting should not exceed 950 degrees Celsius, and the pressure should also be controlled at about 1.00MPa; 2) The quartz combustion tube and the detection site The chemical reaction of the sample causes it to break. The chemical formula of quartz is silicon dioxide. Under high temperature conditions, it is easy to chemically react with salt or alkaline substances, thereby corroding the combustion tube, and its strength will gradually decrease. , it is easy to break. In this regard, the method of adding halogen or silver wire of iron filings can be used to troubleshoot. During use, the method of adding silver wire can remove chemical elements such as Br and Cl, and reduce corrosion to the instrument; It leads to the rupture of the adaptive combustion tube, such as sudden gas and power failure, which can easily cause it to rupture. Therefore, in daily use, you should wait until the temperature of the quartz tube cools down to 100 degrees Celsius naturally before turning off the power. 2. Gas path failure During the normal operation of the total organic carbon analyzer, the interface will display alarm prompts such as too small flow rate, zero flow rate and too large flow rate. At this time, the sample analysis cannot continue, indicating that there is a problem in the gas path Fault. There are usually two types of faults in the air path: blockage and air leakage. To determine whether the instrument has a gas path failure, the most direct method is to unplug the oxygen inlet and measure the flow rate of the inlet to determine whether it has a failure. According to the normal flow value, according to the order of the gas circuit diagram of the instrument, check the leak point and blockage point of the gas circuit one by one. In addition, for gas circuit blockage faults, you can first consider whether the fault is caused by the solenoid valve not working, turn on the analyzer and computer, and then open the gas circuit diagram to check whether the corresponding solenoid valves can work normally. , it is not a fault caused by the solenoid valve. Finally, use the leak detection function of the analyzer to check the running direction of the gas circuit step by step. For air leakage failure, you can first check whether there is a solid sample delivery cup in the solid reactor, and carefully check whether the horizontal iron sheet of the reactor is firmly fixed. If it has not returned to normal, you can check all the joints or nuts on the gas circuit of the instrument Gasket, check whether the air leakage is caused by the aging of the gasket or poor sealing. If the fault cannot be eliminated, you can turn on the analyzer and computer, and click on the gas circuit diagram of the instrument, and use the built-in leak detection The tool checks the air path step by step for air leakage. 3 The syringe made abnormal noise and could not be returned correctly. After the total organic carbon analyzer was turned on, it was found that the initial sound of the syringe was abnormal. During the analysis of the sample, the remaining sample could not be completely eliminated. After testing, the engineer found that the position of the sensor of the syringe was abnormal. . In this regard, first of all, adjust the position of the sensor in time, adjust it to the best and then test run. The sound of switching on and off is also normal, and the fault is eliminated. Routine maintenance According to the common faults of high and low concentrations summarized above, we also give you some suggestions for daily TOC use: 1. Routine operation and maintenance and environmental requirements (1) Wait for at least 3 minutes after turning off the power before turning it on. ; (2) The total organic carbon analyzer is a high-precision analytical instrument, please handle it with care and avoid violent vibration. (3) At the same time, pay attention to the humidity of the place where it is placed and the indoor temperature. During daily maintenance, you should pay attention to the ambient temperature and pressure, and avoid direct sunlight and high temperature. If you operate in an environment with excessive temperature (over 40°C), it may cause analysis The instrument cannot work normally; if it is operated in an environment with too low temperature (10°C), it may cause errors in the measurement results of the analyzer or freeze the pipeline. (4) In order to ensure normal operation, regularly check the life of the UV lamp, and replace the accessories of the UV lamp in time. When replacing the UV lamp, you must wear special gloves to avoid leaving fingerprints on the surface of the UV lamp tube and the surface of the spiral quartz tube. Fingerprints absorb UV light and reduce the oxidation performance of the oxidation reactor. At the same time, care should be taken to prevent damage to the lamp tube and the helical quartz tube around it. (5) There should be less dust in the environment, so as to reduce the influence of dust on the operation of the instrument and the internal circuit board of the instrument, and avoid short circuit or affect the performance of the instrument; (6) The instrument cannot be used with analytical instruments with volatile organic compounds (such as liquid phase or gas phase) (7) The instrument should be calibrated once a year. 2. Pipeline maintenance (1) If the total organic carbon analyzer is not suitable for more than 5 days, the liquid in the pipeline should be drained and sealed with a sealing film to avoid contamination. If the instrument has not been used for a long time , or after detecting a water sample with an excessively high TOC value, the pipeline needs to be rinsed with high-purity water for more than 6 hours; (2) The peristaltic pump tube will be aging and worn after long-term use, and should be replaced regularly; (3) Flush the pipeline before and after each operation, and insert the two tubes into each other when not in use. The pipeline should be submerged under the liquid surface during operation and shutdown. 3. Installation, grounding and maintenance The total organic carbon analyzer must be well grounded at the beginning of the installation and equipped with a regulated power supply to prevent the total organic carbon analyzer from failing when the power grid is unstable or some interference signals appear. work normally, or even destroy the instrument.
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