AS-2011 Laser Particle Size Analyzer


AS-2011 is a Laser Diffraction Particle Size Analyzer working with principle of Mie Scattering to precisely determine the particle size distribution from 0.1 to 500 micrometer. This equipment has a few advantages all its own.


Robust laser diode and innovative photocells optimize the precision of static light scattering and give AS-2011 a longer operational lifetime.

Patented optical bench uproots light path deviation, one of the major technical problems in the industry of particle size analysis.

User-friendly program and advanced algorism bring accuracy and repeatability qualification to International Standard ISO13320-1 Particle Size Analysis - Laser Diffraction Methods.

Laser particle size analyzer price is usually expensive however AS-2011 has become the most reliable and cost-effective laser diffraction particle size analyser being widely used in Particle Characterization.


AS-2011 Laser Particle Size Analyzer Host

Small Volume Cell Assembly (Micro Cell)

One-block Optical Bench

Laser & Lens

AS20 Peristaltic Dispersing Unit

Sample Cell (Micro Cell)

laser particle size analyzer desktop

laser particle size analyzer background

laser particle size analyzer measurement

laser particle size analyzer graph

laser particle size analyzer results table

laser particle size analyzer result analysis report

Particle Size Analyzer Principle

Particle Size Analysis Principle


  • Measurement Principle: Mie Scattering Theory/Laser Diffraction Principle, same principle as Mastersizer 2000
  • Size Range: 0.1-500 um ( particle size D50, D03, D06, D10, D16, D25, D75, D84, D90, D97, D98 etc. )
  • Repeatability: <1%
  • Accuracy: <1%
  • Light Source: Semiconductor Laser Diode as long as 25,000 hrs
  • Measurement Time: <60 seconds
  • Power: 220V/110V 50/60Hz 80W
  • Data Connection: RS-232
  • Operating Systems: Windows
  • ISO Norms: ISO 13320
  • Particle size distribution such as Median D50, D03, D06, D10, D16, D25, D75, D84, D90, D97,D98 in micron range.
  • Abrasives, Adhesives, Agrochemical
  • Barite, Batteries, Bentonite, Boron Carbide, Brucite, Bubble
  • Calcite, Calcium Carbonate, Carbon Black, Catalysts, Cement, Ceramics, Chemicals, Clay, Coal, Coatings, Corundum, Cosmetics
  • Diamond Powder, Dolomite, Diatomite
  • Emulsion, Environmental, Explosives
  • Ferrite, Flour, Fluorescent, Fluorite, Food & Beverage, Food Additive
  • Graphite, Grinding
  • Inks, Kaolin
  • Medicine, Metal Powder, Mica, Milling, Minerals
  • Oxides
  • Paints, Paper, Petrochemical, Pharmaceuticals, Pigments, Plaster, Plastics, Polymers
  • Quartz
  • Refractory, Resins
  • Silica, Slurries, Soil Sediments, Starch, Sulfur, Synthetics
  • Talc, Toners, Tourmaline
  • Wollastonite, Zeolite, Zirconium Silicate etc
  • Special Coating
  • External (corrosion resistant) and internal (anti-reflective) coatings effectively shield the interference by unwanted light and reflecting walls. Special coating protects the laser diffraction and improves the analyzer performance.
  • Robust Light Source
  • Excellent monochromatic laser diode works for at least 25,000 hours. No work, no loss. Monochrome improves the accuracy and long lifetime extends the working life of laser particle size analyzer. A novel technology integrates Fourier lens into the holder of laser diode which optimizes the light path alignment.
  • Stable Optical Bench
  • All major optical assemblies such as laser, cell holder and detection system are firmly fixed on one cast steel optical bench. This patented design uproots light path deviation, one of the major technical problems in the industry of particle size analysis.
  • Sensitive Photocells
  • High-resolution photocells make AS-2011 much more sensitive than any other particle size analyzer. Detection system array effectively captures the scattered light thus ensures the authenticity and accuracy of particle size characterization.
  • High-Speed Circuit Boards
  • Circuit boards of serial port, filtering, amplification and data transmit & process have a considerable advantage in speed over traditional ones. They work with new algorism to give a satisfactory measurement time.
  • Versatile Small (Volume) Cell Assembly
  • The small cell assembly has found wide applications because of its very small fault rate and high reliability. Corrosion-resistant small cell can either hold water or other mediums. Micro silent agitator fully stirs up the suspension and improves the accuracy and repeatability.
  • Optional AS20 Dispersing Unit
  • AS20 Dispersing Unit integrates functions of dispersing, agitating and circulating. It effectively suspends high-density particles in water to achieve a better accuracy. The panel of AS20 is simple and easy to use.
  • Ingenious Cell Holder
  • Patented cell holder makes the shift between small cell and flow cell assembly easy and safe.
  • Advanced Mie Scattering
  • AS-2011 laser particle size analysis system adopts the most advanced principle of Mie Scattering and gives the micron particles a scientific and objective particle size analysis.Theory of particle size analyzer is very important
  • Accurate & Fast Algorism
  • A new algorism has been designed which will be able to obtain the accurate results and greatly reduce the measurement time.
  • Flexible Parameters
  • In order to improve the correlation capability of AS-2011 with other laser particle size analyzers, AimSizer develops advanced and flexible parameters to make AS-2011 the preferred substitute of world renowned LPSAs. These parameters can provide users with the acceptable correlation results.
  • Safe Log on
  • User can log on particle sizing software in two ways: Administrator or Operator, only Administrator is authorized to modify the major settings of particle size analysis system, which greatly improves the security and stability.
  • Automatic Measurement
  • The automation starts with automatic error detecting on background and light path, and then size analysis is carried out automatically. In less than 60 seconds size distribution is displayed on the computer screen ready for exporting to Excel or print.
  • Comprehensive Analysis report
  • The result analysis report includes typical values, size distribution curve/histogram as well as table of size distribution in order to compare with other results respectively. Particle size includes D50, D03, D06, D10, D16, D25, D75, D90, D97, D98. User is also allowed to edit and customize the report.
  • Authoritative Validation & Traceability
  • Aimsizer validate each unit by measuring stable Certified Reference Material CRM SBC2005, which ensures the performance of each analyzer and optimizes the traceability. The results obtained must agree with the standard values before export.
  • Satisfying Accuracy & Repeatability
  • More than meeting the requirement of ISO13320-1 on accuracy and repeatability (<3%), AS-2011 further optimizes the reproducibillity to a new level (<3%)
  • Small Cell Assembly
  • Principle/Theory: Small volume cell is also called micro cell. It is a transparent cell usually made of quartz with parallel faces. It is used to hold sample suspension when using static light scattering method to determine the particle size distribution. During test, an inside stirrer moves up and down to suspend the particles. The laser illuminates the particles, then detector collects the diffracted light and the data is transmited and processed, the software calculates according to laser diffraction and Mie Scattering and output the particle size distribution to accomplish the particle size analysis.
  • Dispersing Unit
  • Pinciple/Theory: Dispersing Unit is sometime called circulating and dispersing unit. It integrates suspension dispersing and circulation. The dispersion is done by ultrasonic probe attached using special technique to the bottom of the tank.The flow through cell is open both on the top and bottom not like small volume cell, the agitator blends and peristaltic pump sends the fully dispersed (by ultrasonic) particle ensenbles to the flow through cell, the laser is diffracted by the particles and the photocells receive the data and the electric board transmit and process for further particle size analysis in the software.
How To Use An AS-2011 Laser Particle Size Analyzer
  • Precise lens are located inside the unit, keep the surrounding environment dry to prevent the lens from going moldy. Generally it is not necessary to clean the lens, if it is necessary, follow the procedures: Use a crocus cloth or pledget absorbent cotton dipped into mixture of ethanol or aether (1:1) then shake up the mixture, wring it dry and wrap around the lens and rotate the lens at the same time, clean it from center to outside, use another cotton and repeat until it is clean.
    Carefully handle the sample cell and d o not scratch the sample cell.
    Do not shut on or off the agitator in a short period of time, turn off the unit if there is no routine test in a long time, the computer may not be shut off but the software has to be restarted after turning on the unit
    Check the ground cable regularly.
    The interval between each turning on or off should be longer than 5 seconds.
    Shut off the power before connecting or disconnecting the data cable.
    Use wet towel dipped into the detergent then wring out excessive detergent before cleaning , don't let liquid inside of the unit.
    Handle carefully in case of transport.
    The unit is precise instrument so put it in a stable, solid workbench free from any vibration.
    The power voltage should be between 200V ~ 240V, stabilized power supply is recommend if necessary.
    In case of any question during the operation, use can refer to Help.
    This function is open to the only administrator.
    Administrator can validate or invalidate some authorities of the operator such as measuring certain particle, using certain liquid as medium, controls on obscuration.
    In case of no particle or medium in the inventory user has to add new particle and thus generate Mie file of the corresponding medium. Input the refractive index of the new particle including the real and imaginary part and refractive index of the relevant liquid medium, click on Calculate, the system will calculate and generate a corresponding Mie file and save it to the Miedata under installation file, user can also check all the existing Mie files here.
    The ratio between each two neighboring sizes is always the same. Select Logarithm in Coordinate and the process is the same as Linear but the minimum size is not less than 0.1um.
    Each spacing is equal. Click on Generate, the system show Generate window, input in Min size and Spacing and click on Generate, the system will generate according to your requirement, but the maximum should be less than or equal to 76 and the last less than or equal to 999.99 um.
    It is used to set the grades directly, in such case you have to input each grade, the size could be any value in range of 0-999, repeatable numbers are not allowed and the total number of grades should be less than or equal to 76. Linear or Logarism grades are particular case of Edit. Click on Custom Grade, input size in the left space after that click on OK to return to the main window. Now the results to be shown or printed is customized.
    User can edit or generate custom grades and the Generate also includes Linear and Logarism.
    AS-2011divides the range of 0.1 m m— 500 m m into 76 size grades, click on the button the system shows or prints specific form. Fractional numbers are not easy for the user to investigate the results, so use Custom Grade.
    Click on Wallpaper to choose favorite picture as the desktop of the system.
    It is used to set the Coordinate, and Color in the graph.
    Show or shut off system indication.
    Show or shut off shortcut
    Convert current result on the temporary memory to Excel for easy reading or transfer.
    Click on Unite and it is used to average several test data and recalculate (in case of any difference in medium type, analysis model or sample type, Unite can't go on. Operation is as Comparison, after that click on Unite to show averaged result. Click on OK to return to the main window and the united result becomes the temporary memory of the system and user can save or show the results.
    Click on Compare and select the sample to compare, click on Add to move it to the lower window for comparison or Delete to move it back. After that click on OK, Compare can be done between different tests on the same sample and also between different samples to check the difference in size distribution. Click on print to output.
    Click on Delete to show window. Select the sample to delete in the Sample List and press Ctrl and Shift at the same time to select more. Click on Delete, the results will be removed but be careful before taking action since it will delete the results permanently.
    In case of numerous results, direct query becomes difficult and user can use Fuzzy Query to find sample in specific type. Select specifically in Match including Sample, Medium, Operator, Date and Time or Company then input in Keywords to show the results, then select in the Sample List (Inventory) and click on Query to show results.
    Directly select sample In the Sample List (Inventory), click on Query to show the results, and it becomes the temporary result in the computer.
    Click on Query, the system will show all saved results and user can query as follows:
    Click on Save to save the current result. Sample, Medium and Operator are editable. For serial test, only one result is saved.
    Print test report
    Preview the test report. Move the mouse on the report and left-click to zoom in or out.
    User can set the printer however it becomes invalid after exiting the test system. User is recommended to set in the My Computer-Printer to keep the favorite print parameters.
    Backup the data in current database to another database. It does not change the setup in current database. It helps backup tested results or parameter setup. In case the operating system is re-installed, select the database to recover the parameter set before.
    Open an old database to query an old results and it becomes default database, all new results will be saved in the database.
    Setup a new database to save results of new sample or from different operators and the system defaults it current database.
    In AS-2011 laser particle size analysis system, all results are saved in the corresponding database. Setup different data base to save results of different sample or from different operators.
    In the test system all results including query result can be shown in graph, table and typical results, user can save, print and convert it to excel in each window. When the ‘Times' in Document is set for more than one, the system shows Serial Results, double click on any one, it shows three different forms of the same test including Graph, Table and Typical Results.
    In Serial Resullt, it gives typical result and graph of the averaged results. Click on Save it is saved to current database, click on Print to output the typical result and averaged curve of the serial tests.
    When it shows results, click on OK the system saves the test results to temporary memory and returns to previous window. User can also save, print or export test result to Excel.
    Click on Result, the system shows the results on the temporary memory, for serial test, it shows the serial results, for single test it only shows single result.
    Click on Exit to close test window and return to main window.
    Operator can go to Measure Background and Measure Sample and modify color of the histogram.
    After click on OK or Cancel in Measure Background, the system will acquire the diffracted light signal automatically but does not start calculating, the current obscuration can be found in System Shows. In case of unsatisfactory background, user can click on Start in Measure Background to re-measure the background, and the old acquired data is overwritten automatically. After background measurement, add some sample to the tank of AS20 Dispersing System or well dispersed sample suspension to the small volume cell inside the analyzer. Click on Measure Sample-Start, the system starts acquiring the data of diffracted light by particles and starts calculating with advanced algorism.
    Should obscuration data not in allowed range (allowed range is decided by the Administrator), the system gives prompts such as Obscuration too high or low, please reduce or increase and the operator acts accordingly to get a good obscuration. Please note for newly incoming sample, add simply a little at first and add more times. For test using small volume cell, excessively high obscuration brings trouble since the operator has to take out and clean the small cell, retest the background and operate test all over again. For test using AS20 Dispersing Unit, operator has to drain some suspension before adding more water into the tank.
    In case obscuration data comes within per mitted range, click on Measure Sample-Start, the system starts measuring and finally shows test data automatically. For single test set in Document, system shows Test Results including Graph, Table and Typical Results but for serial test, it shows more. Double click on the result it gives details. Click on Measure-Results, system shows the previous one or the query result being recalculated under the current Document (recalculate according to the current Medium, Analysis Model or Sample Type).
    After filling the Document, click on OK or Measure to enter test window. Background is actually the total value of electric data on the photocell with only medium in the sample cell and it is between 0 and 10.
    Then click on Measure Background-Start and check the background status in System Shows, if it shows ‘Ready for Test', click on OK, the software saves the background data automatically, then add sample to go on with test. During test, the software will deduct the data to remove the negative effect of sample cell or medium on the test results and make the result much more accurate, in simple words, it is system zero setting.
    After click on Start, if user clicks on Cancel , the system defaults the previous background data and give up the current measuring data. In case that there is suspension in the sample cell and repeatable test is required, this button is recommended.
    Operator can re-Click on Start after click on Cancel to measure background again.
    Document is basic description of the sample to be tested including Medium, Dispersant, Sample, Operator, Date & Time, Times, Company and Remarks which are to be shown on test report and none of them affect the results. However other boxes including Medium Type, Model and Sample Type which can be added to the operator by the Administrator using setup are important for test results and if log on as operator, he is not authorized to add or delete but has to choose the corresponding information to avoid mistake.
    Click on AS-2011 Laser Particle Size Analysis System on the Desktop to login as Operator or Administrator.
    Turn on stabilized voltage supply (if necessary), analyzer, monitor, computer and printer one by one.
    After a long time, some fine particles will accumulate on the inside of the flow cell in AS20 and user has to clean the cell to assure the accuracy. The steps are as follows: take out Flow cell assembly, remove the screw on the cell holder, take out the cell but do not forget the side orientation (up and down, front and back), immerse the cell in detergent, hold between fingers on the side of the cell, then dip cotton rod into detergent, clean and wash it with distilled water, finally clean it with tissue. Put it back to cell holder in original orientation (with right side) and put on the seal, screw down, insert small cell assembly to the instrument. If there are scratches, abrasion, crack or other damages on working area (through which a laser pass), a new cell is needed. Clean it before replacement; mark to indicate “up” or “down”, “front” or “back” for easy cleaning in future. Insert the assembly into the instrument, add AS20 500ml distilled water, then turn on Circulate to fill up the pipeline, after that start the computer to test the Background.
    Usually when it meets the following requirement, user can use Dispersing Unit: a. medium is not corrosive with low viscosity for better cleaning (water is recommended) b. large quantity of sample c. sample density less than 7.
    After test, turn the knob to drain the suspension. Add about 300ml water to the tank, switch Rotation between Clockwise and Anticlockwise repeatedly two times to for a better cleaning. Then turn to Clockwise and switch the knob between Circulate and Drain for repeated two times at last turn to Drain. Add 300ml water again and repeat above operations until the tank, pipeline and test window are all clean.
    In case of a proper obscuration, click on Measure-Start for sizing experience.
    -When it is too high:Turn on Agitator to fully disperse and homogenize the suspension, then turn the knob to drain some suspension then turn back to Circulate, add water until a proper obscuration. Bear in mind for next time add little by little to optimize sample adding. -When it is too low:Turn off the Pump, add more powder to the tank then turn on the Agitator and Ultrasonic for dispersion, then turn on the Pump and test the obscuration until it is proper. Bear in mind next time add more powder to optimize sample adding.
    Turn off the Pump to stop circulation. Add 1/5 to 1/3 spoon of sample (specific quantity subject to the sample type and particle size) to the tank. After that turn on Agitator and Ultrasonic to disperse and homonize the sample. Please refer to 3.3.2 for ultrasonic time. 3 to 5 minutes for almost all the sample. Turn on Pump, supply consecutively the suspension to the test zone and start test software to test the Obscuration.
    Turn on Pump to circulate the medium, go on to test the background in case the medium fulfills the pipeline and goes back to the tank.
    Turn on the Dispersing Unit, and turn the knob to Circulate, change to new section of silicon tube if it is worn and add 500ml medium to the tank. Newly filled circulating tank and pipeline may contain bubble, which could spoil the accuracy. Turn on ultrasonic then repeatedly stop and start circulating several times (interval 2-3 seconds) until no bubble come up.
    It includes peristaltic pump, ultrasonic disperser, agitator, flow through cell, pipeline, test window module and valve etc. stir fully the dispersed suspension and take some for test, remember the concentration graph and data, then continue dispersing in ultrasonic, do the same, until the peak shape and obscuration data on the right side are basically the same or there is reduction to the last time, which shows the last dispersing is already very good.
    Stir fully the dispersed suspension and take a little under the microscope, if there is no aggregate, stop the dispersing.
    put the beaker loaded in suspension in the ultrasonic, turn on and start dispersing. It takes different time due to the difference of particles in sample type, surface energy and static properties and aggregate property. The following table gives some most popular examples.
    add medium and dispersant to the two thirds of the beaker, then add sample, stir it fully and put the beaker in the ultrasonic or stir while dispersing. The quantity of sample for test depends on the particle size, generally finer sample need fewer and bigger sample need more. Estimate the quantity roughly before start. Generally make the concentration a litter higher, but too high concentration will increase the difficulty of dispersion, normally make the suspension semi-transparent.
    by disk riffler: Use special sampler
    Conical quartering: pile the powder into a cone and cut it vertically into four equal parts with thin sheet, mix the two parts on the cross to form another cone, then repeat again until the weight of one part meets the needs (reduced to about 1 gram)
    by spoon: Take sample at multiple places (at least 5). Add all the powder on the spoon to the beaker, partial use is not recommended.
    In case of liquid suspension, please shake up before sampling at multiple places.
    In case of powder stored in hard packing material such as barrel, please use sample at multiple places and multiple depth.
    In case of powder packed in braided bag, tubular sampler can be used at multiple places on the bag.
    If possible, take sample from the discharge hole on the product line and it takes at least two seconds and takes all the powder at the hole.
    Ultrasonic: accessory, Power 50W and Frequency 50Hz. It is used to make suspension, it use pneumatolysis generated by the ultrasonic to separate the particles.
    Dispersant: it is those which can be added in small quantity to the liquid and with excellent wetting quality it reduces dramatically the surface tension of the medium. Different sample decides different dispersant. Hex Metaphosphate or Sodium pyrophosphate is frequently used. It has two functions: one is to speed up the course of aggregate dissolving to single particles, second delay or prevent the reunion of single particles into aggregate. The dosage is two to five thousandth of the total weight. Add the dispersant in advance at certain ratio and use after fully dissolve. When organic solvent is being used, dispersant is not necessary since for most solvents, it has dispersant properties, moreover some solvents do not dissolve the dispersant.
    Quality tissue: wipe off sample cell
    Special injector: inject suspension to the sample cell.
    Special agitator: make suspension
    Sample spoon: take sample
    Beaker (50ml or 100ml): one at least.
    Distilled water(liquid medium): at least 500ml deionized water or purified drinking water the standard is transparent without impurity and no chemical reaction between mineral composition of the water and the sample to be tested to change the status of the particles in suspension. In case of any physical or chemical reaction of particles in purified water such as dissolution, flocculation, agglomeration, expansion, user has to use organic solvent or saturated solution of sample as substitute. In case of particles becoming easier to adhere to the surface of the glass (sample cell) due to the solvent, please use other substitute. Please note that when saturated solution of sample is used, it has to be prepared and used in the same temperature, otherwise the solution becomes unsaturated or crystallization may exist. The filtration of saturated solution is of the same significance and those containing sample particles in the saturated solutions can not be used as liquid medium.
    Enter particle size analysis system, log on as Operator or Administrator, for the first time logging as Administrator, user needn't input pass word. Click on Measure-Start, after filling out the Document, click on Measure-Measure Background-Start and check the status of the unit in System Shows, if background is normal, click on Measure Background-OK and add sample for test.
    Turn on the analyzer.
    After setup a new icon appears on the Desktop.
    Double click on My Computer then the CD-RAM driver, double click on Setup.
    Insert CD-RAM into the driver, the setup runs automatically. If not, user has to do 2.3.2
    Connect the monitor, printer, keyboard, mouse to the computer then turn them on. If everything is OK, turn off the power and connect the analyzer to the computer with RS-232 data cable. Please refer to CONNECTION OF AS-2011 AND AS20 .
    Check accessories, spare parts and documents according to AS-2011 BILL of GOODS .
    Open the top cover and remove packing material if any. Check the outer face and buttons, knobs or sockets on the unit.
    Take out the unit and put it on the left of the workbench, followed by AS20 Dispersing Unit and Ultrasonic Disperser on the right, please confirm the four supports of the unit are horizontal.
    Engineer that has been working with laser particle size analyzer for at least 1 year after careful and complete reading of this literature.
    Engineer from the user or distributor, trained and qualified.
    Engineer from manufacturer.
    Clear and clean without smoke or dust, in damp-proof and dust-proof package.
    Temperature from 5 Celsius to 60 Celsius , relative humidity less than 85% without condensation
    Power is properly grounded.
    Solid and stable workbench, Length at least 1800mm ;Width at least 500mm , Height at least 500mm and less than 1000mm
    Clear and clean without smoke, dust or any mechanical vibration or electromagnetic disturbance.
    Temperature between 5 Celsius to 40 Celsius , relative humidity less than 85% without condensation, water supply and drain available.

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