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Timely resolution of high-precision sulfur analyzer issues is the key to ensuring data accuracy
Date: 2025-12-15Read: 0
High precision sulfur meters are widely used in industries such as coal, petroleum, chemical, and power to determine the total sulfur content in samples, which is crucial for product quality control and environmental compliance. It is based on principles such as high-temperature combustion ultraviolet fluorescence (UVF) or coulometric titration. Although the technology is mature, abnormalities may still occur in daily use due to operation, maintenance, or environmental factors. Timely identification and scientific handling of problems with high-precision sulfur analyzers are key to ensuring data accuracy and stable equipment operation.
1、 Poor repeatability or large deviation of measurement results
Reason: Uneven sample, weighing error, incomplete combustion, unstable gas flow rate, or calibration failure.
Solution: Ensure that the sample is thoroughly ground (particle size ≤ 0.2mm) and mixed evenly; Use a high-precision balance (0.0001g) to weigh the sample according to the standard; Check whether the quartz tube has carbon deposits and whether the catalyst (such as WO?) has failed; Calibrate the flow rate of the carrier gas (high-purity oxygen) to the set value (usually 800-1000mL/min); Regularly perform multi-point calibration using standard coal samples or benzoic acid to verify linearity.
2、 High baseline noise or signal drift
Reason: UV lamp aging, reaction chamber contamination, photomultiplier tube moisture or gas path leakage.
Solution: Clean the reaction chamber and filter to avoid sulfur deposition interfering with the light path; Check if there is any air leakage at the air circuit joint (soap solution test can be used); If the instrument has not been used for a long time, preheat it for more than 30 minutes before turning it on to remove moisture; If the lifespan of the UV lamp expires (usually 1000-2000 hours), the original light source needs to be replaced.
3、 Blockage or cracks in the combustion tube
Reason: The sample contains too much ash, the injection speed is too fast, or the quartz tube is rapidly cooled and heated.
Solution: For high ash samples, the sample size should be reduced or flux should be added; Smooth movement during injection to avoid sample splashing; Before shutting down, cool down to below 500 ℃ and then turn off the gas source to prevent thermal shock rupture. Once cracks are found, the quartz tube must be replaced immediately, otherwise it will cause air infiltration, affecting combustion efficiency and safety.
4、 Slow response of electrolytic cell (Coulomb method model)
Reason: electrolyte failure, electrode contamination, or reference electrode drying up.
Solution: Regularly replace fresh electrolyte (usually every 50-100 tests); Soak the platinum electrode in dilute nitric acid to remove sediment; Ensure that the reference electrode is filled with sufficient liquid. If the endpoint determination of titration is abnormal, the "electrolytic cell equilibrium" program can be executed to reset the baseline.