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Common problems and corresponding solutions of powder particle size testing system
Date: 2025-10-16Read: 0
The powder particle size testing system is a core tool for evaluating the size and distribution of powder particles in fields such as materials science, pharmaceuticals, chemical engineering, ceramics, and new energy. Its test results directly affect the fluidity, solubility, reactivity, and performance of products. Whether it is laser diffraction method, dynamic light scattering method or screening method, any operational deviation or environmental interference may lead to data distortion. Mastering common problem-solving methods for powder particle size testing systems is the key to ensuring that test results are scientific, reliable, and reproducible.
Problem 1: Poor repeatability of test results or significant data fluctuations
Cause analysis: Uneven sample dispersion, improper injection concentration, abnormal background signal, or environmental vibration.
Solution: Ensure that the sample is fully dried and free from agglomeration, and use an ultrasonic disperser to assist in dispersion (time and power need to be optimized); Adjust the opacity to the recommended range of the instrument (usually 10% -20%); Perform background calibration before each test; Place the instrument on a shock resistant platform to avoid external interference.
Problem 2: Abnormal peaks or double peaks appear in the particle size distribution curve
Cause analysis: Sample contamination, mismatched dispersion medium, or residual particles in the system.
Solution: Check if the dispersion liquid (such as water, ethanol) is pure, filter it before use (0.45 μ m filter membrane); Clean the sample tank, circulation pump, and pipelines to avoid residual samples from the previous batch; Confirm that the powder has not been contaminated by foreign impurities.
Question 3: The instrument prompts "high shading" or "high concentration"
Cause analysis: Excessive sample addition or insufficient dispersion leads to particle aggregation.
Solution: Gradually reduce the sample size and use the "small amount multiple times" addition method; Enhance dispersion methods, such as extending ultrasound time and adding appropriate dispersants (such as sodium hexametaphosphate); For samples that are prone to aggregation, the injection speed can be reduced.
Problem 4: Laser alarm or optical path calibration failure
Cause analysis: laser energy attenuation, lens contamination, or optical path deviation.
Solution: Check the usage time of the laser and replace it if it exceeds the deadline; Wipe optical components such as collimating lenses and Fourier lenses with a dust-free cloth and specialized cleaning solution; Execute the system self calibration program and contact the manufacturer for optical path calibration if necessary.
Problem 5: Poor circulation or blockage of wet dispersion system
Cause analysis: Large particles not pre screened, pipeline aging, or pump body wear.
Solution: Use a standard sieve to remove oversized particles before testing; Regularly check whether the pipeline is aging or deformed; Clean the pump chamber and remove sediment; Replace worn impellers or seals.