Calibration specification and error range of quartz sand particle size
analyzer
Quartz sand particle size analyzer (such as laser particle size analyzer,
sieve particle size analyzer, etc.) plays a crucial role in quartz sand
production. By accurately measuring the quartz sand particle size, it ensures
product quality and production process optimization. In order to ensure the
accuracy of particle size analysis results, it is necessary to regularly
calibrate the particle size analyzer and control the error range. The following
is a detailed explanation of the calibration specifications and error range for
quartz sand particle size analyzer:
1. Calibration specifications
1.1 Preparation before calibration
Equipment cleaning: Before calibration, ensure that the outside of the
equipment is clean to avoid dust or impurities affecting the test results.
Calibration standard substance: Select standard samples or calibration
particles for comparison with the measurement results of the instrument. Common
standard samples include glass beads, standard sand, or precisely produced
particle size standard materials.
Environmental conditions: Ensure that the calibration process is carried out
under appropriate temperature, humidity, and air pressure conditions. The
environmental conditions have a significant impact on the laser particle size
analyzer, usually carried out at a temperature of 20 ° C ± 2 ° C and a relative
humidity of 40% -60%.
1.2 Calibration steps
Cleaning equipment:
Use professional cleaning tools to clean the optical lens and measurement
area of the instrument, ensuring that there is no dust affecting the measurement
results.
Select standard calibration samples:
Use standard samples with known particle size distribution for calibration to
ensure that the particle size range of the calibration sample matches the
particle size range of the quartz sand sample to be tested.
Set instrument parameters:
Adjust the basic settings of the particle size analyzer (such as scanning
time, laser power, resolution, etc.) to ensure that the instrument is in a
suitable calibration state.
Perform calibration testing:
Start the instrument for calibration and record the measurement results.
Compare with the known particle size distribution of the standard sample to
verify whether the instrument is in accurate working condition.
Adjust the instrument:
If there is a significant deviation between the calibration results and the
standard sample, it is necessary to adjust the laser focusing, lens calibration,
photodetector and other components according to the instrument instructions.
Some high-end instruments can be automatically adjusted through internal
software.
Record and report:
Record the results of each calibration and save the calibration report as an
important basis for quality control.
1.3 Regular calibration cycle
Calibration once a month: For production lines that require high precision,
it is recommended to conduct a calibration check once a month.
Calibrate once every quarter: For production lines with general accuracy
requirements, it is recommended to calibrate once every quarter.
2. Calibration error range
2.1 Source of Error
Instrument accuracy limitation: Even for high-precision instruments, the
error range will be affected by the design accuracy and measurement method of
the instrument itself.
The non-uniformity of the sample itself: The particle size of quartz sand may
have a certain distribution width, especially natural mineral sand, and uneven
particle size distribution may lead to errors.
Environmental factors: External environmental factors such as temperature,
humidity, and air pressure can affect measurement accuracy, especially for laser
particle size analyzers, changes in environmental conditions may lead to
measurement errors.
2.2 Error Range
Screening method particle size analyzer:
Error range: usually within ± 5%. For ordinary sand and gravel samples, the
screening method may have slightly larger errors, especially when approaching
the particle distribution boundary.
Laser particle size analyzer:
Error range: generally between ± 1% and ± 3%. The error of laser particle
size analyzer is relatively small, especially in the case of wide sample
particle size distribution, the error will be smaller.
Accuracy guarantee: The measurement accuracy of high-end laser particle size
analyzer can reach within ± 1%, and even reach an error range of 0.5%.
Other granularity analysis methods:
The error range of methods such as settlement method and static image method
is usually between ± 2% and ± 5%, depending on the equipment type and analysis
conditions.
2.3 Error Control Methods
Regular calibration and maintenance: Ensure timely maintenance and
calibration of instruments to avoid measurement errors caused by equipment aging
or dust accumulation.
Use standard samples: Verify using standard samples with known particle size
distribution to ensure that the equipment remains in the appropriate working
condition at all times.
Control environmental factors: Maintain a stable working environment and
avoid excessive temperature and humidity fluctuations that may affect
measurement results.
Improve operational accuracy: Standardize operational procedures to ensure
uniform sample distribution during each measurement and avoid human error.
3. Calibration result record and report
Data recording: After each calibration test, it is necessary to record in
detail the particle size range of the calibration sample, the actual measurement
values of the instrument, and the error range for later comparison and
review.
Calibration report: Regularly generate and save calibration reports, which
should include information such as equipment model, measurement accuracy,
calibration standards, testing environment, calibration results, and processing
recommendations.
Summary:
The calibration of quartz sand particle size analyzer is a key step to ensure
the accuracy of particle size measurement in the production process. Through
strict calibration procedures and appropriate error range control, the
reliability of particle size analysis results in quartz sand production can be
ensured, thereby ensuring product quality and process stability. Regular
maintenance and calibration can effectively extend the service life of
equipment, improve production efficiency, and reduce quality fluctuations.