Manual - CH Technologies
Contents
1. in ug l i l Cave i C1 n n Where n total number of filters sampled Calibration Procedures without External Gravimetric Sampling Weigh a small amount of powder a few milligrams and load it into the disperser following procedures outlined in Section 3 2 1 Start aerosol generator following procedures in Section 3 2 3 and at the same time start logging in aerosol concentrations data Let VAG operate until the whole powder is dispersed You ll notice this by rapid decrease of concentration values on the MicroDust Pro Stop logging in when concentration values are almost zero Calculate the Correction factor using the formula Page 23 of 32 Gr CH TECHNOLOGIES USA Inc Correction Factor M F T T W A Were M weight of powder loaded into the disperer in mg F air flow rate in L min T running time minutes T W A average concentration recorded by the data logger The air flow rate of the VAG has to be calibrated in advance using a primary standard or a standard traceable flow meter The running time T of the calibration session can be measured either using a precise laboratory timer or the time recorded by the data logger 3 3 3 Working with a User Defined Calibration Factor 1 To use the calculated correction factor with the MicroDust Pro turn on the MicroDust Pro control unit and wait until Last Measurement screen appears 2 Press Menu key lim 3 On the next screen se2. Cleaning Frequency When changing powders or when the device is clogged 1 Following the precedures outlined in Section 4 1 disassemble the VAG and CLA parts and perform a quick cleaning 2 Next using a5 mm allen key remove the two long screws that hold together the deagglomeration assembly 3 Carefully split the components of the disperser and lay them in order on the work surface from the Air Jest Stage the bottom part to the Outlet the top part Refer to Figure 13 for a visual illustration of the deagglomeration assembly parts Page 27 of 32 Srl CH TECHNOLOGIES USA Inc oS Dispersing s Air Jets Stage Capillary Stage Deagglomeration Stage Figure 13 Components of the VAG s Deagglomeration Assembly 4 Remove all the O rings and inspect them for any signs of damage If no damage is noticed proceed cleaning them with mild soap solution or other appropriate cleaning agents If any of the O rings is damaged replaced with a new one For spare sets of O rings contact CH Technologies 5 Thoroughly clean all the deagglomeration assembly and CLA components using the same cleaning agent 6 In case of very sticky powders in additional to cleaning with chemicals sonicate deagglomeration assembly and CLA components for about 30 minutes in a ultrasonic bath to completely dislodge particles ATTENTION DO NOT autoclave VAG parts without consulting first with CH Technologies A 7 At the
3. end of the cleaning process rinse all parts with distilled water and let them dry in room air 4 3 Re assembly of the Deagglomerator 1 Reassemble all the O rings of on all the Deagglomerator components 2 Take the Dispersing Capillary Stage carefully slip the bottom of the capillary tube in the hole at the center of the Air Jets Stage and push it down until it rests The right orientation of the Dispersing Capillary Stage is with the O ring on top 3 Slightly rotate the Dispersing Capillary Stage until its air inlet falls right in the middle of two screw holes as shown in Figure 14 Page 28 of 32 Gr CH TECHNOLOGIES USA Inc Figure 14 Assembling Dispersing Capillary Stage onto Air Jets Stage 4 Take the bottom part of the Deagglomeration Stage and place it around the capillary tube on the Dispersing Capillary Stage Figure 15 Figure 15 Assembling Bottom Part of Deagglomeration Stage onto Dispersing Capillary Stage 5 Next carefully slip the top of the capillary tube through the hole in the center of the upper part of the Deagglomeration Stage and push the latter down until it firmly rests on top of the Dispersing Capillary Stage 6 Rotate the upper part of the Deagglomeration Stage until its air inlet is about 90 to the left of the air inlet of the Dispersing Capillary Stage as shown in Figure 16 Page 29 of 32 CH TECHNOLOGIES USA Inc Figure 16 Assembling Uper Part of Deagglomeration Stage onto Dis
4. except as set forth herein CH Technologies USA s liability under this warranty extends for a period of one 1 year from the date of shipment It 1s expressly limited to repairing or replacing at the factory during this period and at CH Technologies USA s option any device or part which shall within one year of delivery to the original purchaser be returned to the factory transportation prepaid and which on examination shall in fact be proved defecting CH Technologies USA assumes no liability for consequential damages of any kind The purchaser by acceptance of this equipment shall assume all liability for consequences of its misuse by the purchaser his employees or others This warranty will be void if the equipment is not handled installed or operated in accordance with our instructions If damage occurs during transportation to the purchaser CH Technologies USA must be notified immediately upon arrival of the equipment A defective part in the meaning of this warranty shall not when such part is capable of being repaired or replaced constitute a reason for considering the complete equipment defective Acknowledgment and approval must be received from CH Technologies USA prior to returning parts or equipment for credit No representative of ours has authority to change or modify this warranty in any respect Page 32 of 32
5. the test article should be cleaned periodically to assure a proper operation of the instrument Some of the parameters that may impact negatively the functionality of the VAG and lead to the need for cleaning and maintaining the device are the following e Quality of the compressed air used for the dispersion of the powder The air used for the VAG is required to be free of any trace of humidity preferably with a dew point of about 40 F Increased levels of humidity in the air may lead to clumping of the powder inside the disperser progressive deposition of particle clusters and in extreme cases even clogging of the jet hole Clumping may also affect the de agglomeration process resulting in a dry powder aerosol with a larger Mass Median Aerodynamic Diameter MMAD than the that of the bulk material being dispersed e Type of dry powder Generally the VAG performs the best with loose non cohesive powders So if the test material being used is sticky and cohesive more frequent cleaning and maintenance sessions may be needed In any case the powder should be dry If the powder is not naturally dry dry it before loading it in the generator using a desiccator or other appropriate methods e Change of test article As long as the same type of powder is used day after day a quick cleaning after each generation session will be enough However in order to avoid cross contamination a thorough cleaning is going to be needed if you switch f
6. 1 000 User 1 000 Range Auto Display Averaging 2 Secs Logging Interval 1 Mins Synchronise Log Time X Press ri to Select Particle Figure 11 Measurement Settings Screen on MicroDust Pro Using the Up and Down keys on the control unit navigate to menu Range Once menu Range is highlighted press Run Stop key to activate it With the menu Range activated press repeatedly Left or Right keys to select the appropriate measurement range The available measurement ranges are e 0 2 5 mg m e 0 25 mg m e 0 250 mg m e 0 2500 mg m e 0 25 g m e 0 250 g m Page 16 of 32 7 A N T The measurement range should be selected such that the maximum expected measured concentrations fall well within the upper limit of the range For example 1f the target VAG concentrations are between 1 000 1 500 mg m the range 0 2 500 mg m should be selected When the desired measurement range has been chosen press Save key to select it A ATTENTION DO NOT select Auto range The VAG will not function properly if you do ATTENTION Operation at high dust concentrations might lead to contamination of probe optics and a failure to operate on the lowest measurement ranges Contaminated ranges will become locked out however normal operation may be available on other ranges 10 11 12 13 14 15 Next in the Measurement Settings screen navigate to Display Averaging menu and highlight it by pressing the Run S
7. 15 minutes turn off the sampling line and in quick succession press Run Stop key and Yes key on the next screen to stop logging Turn off test dry powder generation as described in Section 3 2 3 Remove the gravimetric sampler from the sampling port Determine the aerosol mass concentration given by the filter measurements following the procedure outlined in Section 3 3 1 1 Go to Last Measurement screen on the MicroDust Pro control unit and take a note of the run s measured average Calculate the correction factor as Correction Factor Gravimetric Concentration Run s Average Value TWA Page 22 of 32 Gr CH TECHNOLOGIES USA Inc 3 3 1 1 Gravimetric Sample Data Analysis l 3 3 2 Take out of their containers all the filters collected during the calibration session if you are using more than one to calibrate and weigh each of them separately Log their weights in your laboratory book Using the weights of the filters sampling time and sampling flow rate values recorded calculate the aerosol or TPM concentration for each filter in ug l Ci Mia Mib F T Were Ci concentration given by the of i exposure filter ug L Mia weight of i exposure filter after sampling ug Mip weight of i exposure filter before sampling ug F flow rate in lpm T sampling time minutes Calculate the average aerosol or TPM concentration for all filters used during the sampling session
8. 2 2 to do so Pressurize the air supply line of the VAG and using appropriate flow controllers set the air flow rate at between 8 12 L min Start operating the generator with the Control dial all the way to the left zero output Turn the dial clockwise and adjust the position to a predetermined relative units voltage value As soon as the output is adjusted the red LED light labeled Valve turns on indicating that the air valve has opened starting the powder generation The concentration measured by the aerosol monitor will quickly rise until it reaches the concentration that corresponds to the relative unit number selected by the Control dial Once the equilibrium is reached the VAG will operate with short bursts of air quick opening and closing of the air valve to maintain a constant output During this time the red Valve LED will appear blinking in rapid succession To change VAG s output during operation adjust the Control dial clockwise to increase it and vice versa Dust generation will continue until all the test article in the cup is consumed A rapid decrease of the measured concentration by the MicroDust Pro indicates that the material has been exhausted and the generator needs refilling To stop VAG operation first turn the output Control dial all the way to the left turn off compressed air supply and last power the VAG down Page 18 of 32 CH TECHNOLOGIES USA Inc 3 2 4 Monitoring with MicroD
9. Vilnius Aerosol Generator VAG User s Manual Setup Operation and Maintenance CH TECHNOLOGIES USA Inc Copyright 2015 CH TECHNOLOGIES USA Inc CONTENTS 1 Description and Principle of Operation 0 ccc cece cece cece cece cece ee eeeeeneeenes 3 DN NON 7 3 VAG Operation Procedures c ccc c cece cece eee een eee e eee e eee e eens ee eee eee e nets 8 3 1 Preparing the VAG for Operation 00 cece cece cece e eee eeeeeeeeeenee 8 3 1 1 Assembling the Aerosol Monitor 0 0 ccc cee cee eee e eee e eee e eens 8 3 2 Assembli ms the VAG Parts ccsnccaxcsxnaceeaneydensedesasediantesurenssoursees 9 3 1 2 1 Without Sharp Cut Cyclone 0 0 ccc cece cece cece eee eeeeee ees 9 122 With Sharp Cat Cy Clone x2 552 lt onsncecadsasanenesanenodenseusneet aneeee 12 3 1 3 Setting Up WinDust Pro Software 0 cece cece cece cece eee eeeeneennes 13 32 GE VAC EE tus EE EEEE E NEEE E 14 3 2 1 Loading the VAG with PO nende 14 3 2 2 Setting Up the Aerosol Monitor for Operation cece eee 14 3 2 3 Controlling Powder Output during VAG Operation 006 17 3 2 4 Monitoring with MicroDust Pro during VAG Operation 18 3 2 4 1 Monitoring with the Control Unit ccc cece cence eeee ees 18 3 2 4 2 Monitoring with WinDust Pro Sowftare 0 cece ceeee eee ees 18 3 2 5 Analysis of Aerosol Concentrat
10. download or can be logged in directly onto a PC through WinDust Pro Average spot maximum and minimum aerosol concentration values are recorded over the logging period The software package offers a variety of statistical and visual tools for data analysis The data file can also be opened onto Excel or other spreadsheet software for further processing and visualization l Install the WindDust Pro software on your computer using the provided installation package Following procedures outlined in Section 4 1 2 1 connect the MicroDust Pro control unit to the computer Turn ON the MicroDust Pro control unit Double click on the WinDust Pro icon on the computer desktop to launch the program The profile of the MicroDust Pro supplied with the system has already been stored in WinDust Pro but if you would like to change it or add another profile click on menu Edit gt Profiles In the dialogue window that appears click on Edit if you would like to change the existing profile or New if you would like to add a new one In the Properties dialogue window that appears next click on Data Files tab gt Browse to select the folder where you would like to store the data files Click on Communications tab and under Port select from the drop down list the USB port the device is connected to If you are unsure about the port go to Device Manager from Windows Control Panel click on Ports COM amp LPT and check on what COM port does P
11. e more will take you back to the Last Measurement screen 5 Press Run Stop key to start logging in measured aerosol concentrations 6 To end data logging press Run Stop key again and in the Stop Run Screes that appears press Yes key to terminate the data recording session 3 2 4 2 Monitoring with WinDust Pro Software 1 Turn the control unit ON 2 Make sure you have entered the right correction factor for the dust you are using For procedures how to calibrate the monitor for a particular dust and how to use a calibration factor refer to Section 3 3 Page 19 of 32 3 2 5 CH TECHNOLOGIES USA Inc Launch WinDust Pro software Click on menu Comms gt Real Time or click Aa button to start monitoring On the Realtime Data window that appears you can see a time chart of the aerosol concentration as measured by the monitor Click on Auto Scale button to automatically fit the measured values in the chart Click on drop down lists Timebase Averaging and Log interval to select data recording parameters Click on Start logging button to begin recording and storing aerosol concentration data When the monitoring session is up stop recording the data by clicking on button Stop logging Click on button Close to finish real time monitoring with WinDust Pro Analysis of Aerosol Concentration Data on WinDust Pro If the data file is already stored on the PC open the file by selecting Open under menu File If not fir
12. ent immediately in addition to CH Technologies 3 1 1 Assembling the Aerosol Monitor 1 Remove the inlet and outlet compression fittings from the CLA body black block The inlet fitting is the one connected to the cyclone the outlet fitting is connected to in line diluter under the inhalation tower 2 Remove the Inlet and Outlet laminar flow cuvette parts from the CLA body 3 Slide the protection collar of the aerosol detection cell all the way down 4 Apply a thin layer of silicon grease on the O rings of the CLA block Page 9 of 32 CH TECHNOLOGIES USA Inc Slide the probe shaft into the hole of the CLA body and rotate it until the measurement chamber is perfectly aligned with the inlet and outlet of the CLA Take the Inlet piece make sure you check the label INLET engraved in it and insert it on the side of the CLA block marked INLET Connect the inlet compression fitting and tighten it by hand Insert the Outlet piece make sure the label OUTLET in engraved on it into the side of the CLA block marked OUTLET and screw in the remaining compression fitting 3 1 2 Assembling the VAG Parts 3 1 2 1 Without Sharp Cut Cyclone l Assemble the provided straight stainless steel slip joint connector on deagglomerator s outlet and tighten the nut by hand If your VAG comes with a sharp cut cyclone use the same procedure to assemble the elbow slip joint connector on the de agglomerator Slip the inlet c
13. h a control valve and jets impinges upon the powder dispersing it into the air Simultaneously air jets activate a turbine which is used for continuous supply of powder under the air jets The aerosolization efficiency is increased by means of a vibrating cam which oscillates the turbine OUTPUT AEROSOL GENERATOR MODEL CONTROLLER VAG 2CA Figure 1 View of VAG Units The aerosolization assembly is interconnected with the de agglomeration assembly by a capillary The lower end of the capillary is positioned at the top of the dust chamber while the upper end of the capillary enters the region of high velocity airflow The aerosol particles are de agglomerated in the de agglomeration assembly by the shear forces that are generated between the high velocity airflow exiting through a narrow gap around capillary and the low velocity aerosol stream exiting the capillary Figure 2 Page 4 of 32 Gr CH TECHNOLOGIES USA Inc Turbine Unit Dispenser Top 4 Jets Capillary Figure 2 View of the De agglomerator Assembly A portable aerosol monitor Casella MicroDust Pro equipped with an in line Clean lens Adaptor is used for continuous monitoring of the aerosol output Figure 3 The electrical signal from the Casella sensor is used as Controller feed back signal If the aerosol output decreases the Controller causes the turbine to vibrate more actively and increases the air flow rate through the jets On the contrary the turbi
14. he T W A of the instrument s readings with the mass concentration determined by the filter and 2 by aerosolizing in totality a known amount of powder and comparing it with instruments T W A readings 3 3 1 Calibration Procedures with External Gravimetric Sampling 1 Load the VAG with test article as outlined in Section 3 2 1 2 Connect the provided calibration adaptor to the VAG outlet purchased separately or your own adaptor 3 Weigh a 47 mm filter pad and load it in the gravimetric sampler purchased separately 4 Connect the filter holder to the sampling port of the calibration adaptor 5 Connect a sampling line with a known sampling flow rate to the outlet of the filter holder The sampling assembly should look similar to the one in Figure 12 6 Turn ON the MicroDust Pro control unit 7 Set up Logging Interval per procedures in Section 3 2 2 8 Following procedures outlined in Section 3 2 3 start aerosol generation Wait until the aerosol monitor indicates that the output has reached stability 9 Access the Data screen Page 21 of 32 10 11 12 13 14 15 16 CH TECHNOLOGIES USA Inc Figure 12 Setup for Calibration with External Gravimetric Sampling In quick succession turn on the sampling line of the gravimetric sampler and press Run Stop key on the MicroDust Pro control unit to start logging in concentration readings At the end of the pre determined sampling period usually 10
15. ion Page 7 of 32 2 VAG SPECIFICATIONS e Concentration Range e Air Flow Rate e Dry Powder Capacity e Dispensing Time e Power Input Gr 0 160 g m 8 12 L min 2 or up to 6 hours 110 220 VAC 50 60 Hz Page 8 of 32 Sr CH TECHNOLOGIES USA Inc 3 VAG OPERATION PROCEDURES 3 1 Preparing the VAG for Operation When you receive your VAG you should unpack it carefully and check to make certain that the following parts are all present and in undamaged condition Controller De agglomeration unit Cable connecting Controller to De agglomeration unit Cable connecting Controller to MicroDust Pro Casella MicroDust Pro complete kit which includes MicroDust Pro Monitor Clean Lens Adaptor Calibration kit Software Power supply unit Data cable e 5mm sharp cut cyclone if you ordered the VAG model equipped with cyclone e Straight slip joint connector e Elbow slip joint connector if you ordered the VAG model equipped with cyclone Your VAG may vary slightly in appearance depending upon the model that you ordered and fittings you requested if different from the standard ones An overview of all parts and accessories of the VAG assembly is given in Appendix 1 Any changes from the standard pieces listed above will be noted on your shipping memo PLEASE KEEP YOUR SHIPPING MEMO FOR FUTURE REFERENCE If you find that anything has been damaged in transit contact the carrier of the shipm
16. ion Data on WinDust Pro 19 3 3 Correction Factor Calibration of Dust Monitor ccc cece cece ees 20 3 3 1 Calibration Procedures with External Gravimetric Sampling 20 3 3 1 1 Gravimetric Sample Data Analysis 0 c cece cee e eee eee ees 22 3 3 2 Calibration Procedures without External Gravimetric Sampling 22 3 3 3 Working with a User defined Calibration Factor 0 cece 23 4 Cleaning and Maintenance Procedures 0c c ccc e eee e eee e eee e cece eeeeeees 25 LOT vvs 25 42 Deep CNC ANIL ER 26 4 3 Re Assembly of the Deagglomerator 0 0 c cece cece eee e eee e een e eee e ees 27 5 JG DI E 0 RENEE 30 ol 31 Page 2 of 32 CH TECHNOLOGIES USA Inc Page 3 of 32 CH TECHNOLOGIES USA Inc 1 DESCRIPTION AND PRINCIPLE OF OPERATION The Vilnius Aerosol Generator VAG is a general purpose dry powder disperser The VAG is a highly reliable device which produces aerosol concentrations from 1 to 2 500 mg m In addition to its capability of producing high aerosol concentrations VAG provides exceptional de agglomeration characteristics The instrument consists of Controller and Disperser units Figure 1 The Disperser contains a dynamic aerosolization and a de agglomeration assembly The aerosolization assembly includes a dust chamber for placement of a powder to be aerosolized Airflow directed into the chamber throug
17. lect the Settings icon A and press Run Stop key to advance to the next screen 4 Select the Setup icon d Settings screen Figure 11 and press Run Stop key to go to Measurement 5 Using Up and Down keys navigate to any of the User 1 through User 4 slots under Particle Type and press Edit key to enter Specify a Dust Type Screen 6 Select Name and press Run Stop or Edit keys to activate the keyboard 7 Type a reference name for the dust and press Save key to save it 8 Navigate down to Calibration Factor and press Run Stop or Edit keys to activate the number pad 9 Use Left and Right keys to select the digit and Up and Down keys to change digit values 10 Once the desired calibration factor is entered press Save key to save it Page 24 of 32 CH TECHNOLOGIES USA Inc 11 Repeat the procedure to enter up to three other user defined calibration factors in the available Particle Type slots 12 To use any of the entered calibration factors for measurements go to Measurement Settings screen and navigate to the desired Particle Type 13 Press Run Stop key to select it You will notice the green tick mark appear beside the particle type which indicates that until the particle type is changed again the instrument will use the selected particle type calibration factor for its measurements Page 25 of 32 CH TECHNOLOGIES USA Inc 4 CLEANING AND MAINTENANCE PROCEDURES The VAG parts that are in contact with
18. ne is slowed down and air flow rate is decreased when aerosol output increases An illustration of the VAG s operation principle is given in Figure 4 Figure 3 View of Casella MicroDust Pro Aerosol Monitor with Clean Lens Adaptor Page 5 of 32 CH TECHNOLOGIES USA Inc Aerosol monitor N er 2 2 Se omr omr omr ee Deaglomeration Sheath flow assembly gt 2 1 5 atm air line Dust chamber Rotating vibrating turbine _ Stainless Steel membrane Vibrating cam Controller Figure 4 Schematic of VAG s Principle of Operation Page 6 of 32 CH TECHNOLOGIES USA Inc The highest stability of aerosol output is achieved when Casella aerosol monitor is employed for monitoring of aerosol output Other types of real time aerosol monitors also can be used to monitor aerosol output However additional modifications of the electrical circuit must be made for that purpose Furthermore the stability of aerosol output may be less condensed and aerosol concentration range reduced 1f other than the Casella aerosol monitor is used For applications that require particle size control of the aerosolized dry powder the VAG is equipped with a standard 5 um sharp cut cyclone Custom sharp cut cyclones for other cut sizes are also available The VAG is designed to operate continuously for 0 5 to 6 0 hours depending on the desired aerosol concentrat
19. ompression fitting of the assembled CLA see Section 3 1 1 into the slip joint connector and tighten the nut by hand Insert the provided VAG s outlet connector into the outlet compression fitting of the CLA and tighten the nut Connect your compressed air line 1 4 OD to the air inlet of the VAG Using the provided control cable connect the DISPERSER port on the control unit with the CONTROLLER port on the de aggregation unit see Figures 5 and 6 for illustration of connectors Next use the provided 2 5 mm stereo jack cable to connect the control unit of the MicroDust pro monitor to the port on the VAG control unit labeled CEL 712 Figure 5 This connection will provide the VAG control unit an analog output signal proportional to the aerosol concentration measured by the aerosol monitor Use the provided Mini B USB to A USB cable to connect the aerosol monitor to a USB port on a PC Figure 7 Page 10 of 32 Gr CH TECHNOLOGIES USA Inc 9 Last connect the VAG outlet to your application 1 e inhalation exposure chamber using appropriate connectors MADE IN LITHUANIA VILNIUS 110V 0 5A 220V 0 25A CEL 712 DISPERSER MD 880 Figure 5 Rear Panel of the VAG Control Unit la Figure 6 Rear Panel of the VAG De aggregator Page 11 of 32 CH TECHNOLOGIES USA Inc 1 Power input port 2 Mini B USB port 3 2 5mm output port Figure 7 Connections on the MicroDust Pro Con
20. persing Capillary Stage 7 Place the Outlet on top of the Uper Part of Deagglomeration Stage and rotate it until its 4 screw holes line up with the ones on the Air Jets Stage at the bottom of the assembly 8 Last assemble one of the long screws in the holes between the two air inlets and the other one in the holes opposite to it Tighten the screws using the allen key At the end of the assembly process the Deagglomeration Assembly should look like in Figure 17 Figure 17 View of Completed Deagglomeration Assembly Page 30 of 32 Or CH TECHNOLOGIES USA Inc 5 DISCLAIMER The Vilnius Aerosol Generator is subject to all the terms of CH Technologies USA standard limited warranty The VAG is a specialized article of research equipment intended for use by trained professionals No liability is accepted by CH Technologies USA on account of misuse misapplication or mishandling CH Technologies USA specifically does not condone nor endorse any application or use which involves restricting emissions from the device and thus causing pressurizing of the jar Further CH Technologies USA accepts no liability for exposure to toxic infectious or harmful substances resulting from the use of this apparatus Page 31 of 32 Or CH TECHNOLOGIES USA Inc 6 LIMITED WARRANTY CH Technologies USA warrants equipment of its manufacture to be free from defects in workmanship and material We make no warranty express or implied
21. rolific USB to Serial Comm Port appear Click OK after finish editing the device profile Click button Accept to finish setting up the software Page 14 of 32 Gr CH TECHNOLOGIES USA Inc 3 2 Operating the VAG 3 2 1 Loading the VAG with Powder 1 Unscrew two butterfly screws on Disperser and open the dust chamber 2 Place powder on the top of turbine as in Figure 10 A ATTENTION The volume of the loaded powder must not exceed 2 3rd of the chamber s volume 3 Close the chamber and tighten the butterfly screws by hand making sure that the seal on the chamber is air tight Vilnius Turbine Agitator Figure 10 Loading the VAG with Powder 3 2 2 Setting Up the Aerosol Monitor for Operation In order for the VAG to work correctly the appropriate measurement range display averaging time logging interval and I O signal output range must be selected on the MicroDust Pro Follow these steps to set up the aerosol monitor for work with the VAG 1 Turn on the MicroDust Pro control unit and wait until Last Measurement screen appears Page 15 of 32 CH TECHNOLOGIES USA Inc Press Menu key I j On the next screen select the Settings icon gt and press Run Stop key to advance to the next screen Select the Setup icon d Settings screen Figure 11 and press Run Stop key to go to Measurement Measurement Settings Particle lype Factor Default 1000 User 1 1 000 User 4 000 User 3
22. rom one test article to another 4 1 Quick Cleaning Frequency After each aersolization session 1 Release the compression nut of the CLA inlet and disconnect the aerosol monitor from the VAG outlet in VAG model without cyclone or cyclone outlet in VAG model with cyclone 2 Remove the compression fittings and flow inserts from the CLA and slide the CLA body off the probe shaft 3 Next release the butterfly screws and remove the deagglomeration assembly If you are using a VAG with cyclone also remove the cyclone from the disperser outlet 4 Using a pair of tweezers remove the turbine from the dust cup Page 26 of 32 CH TECHNOLOGIES USA Inc 5 Place all the CLA and VAG parts on clean work surface 6 Use a small suction nozzle 1 e a 1 4 tube connected to a vacuum source to thoroughly clean the dust cup turbine deagglomeration assembly and CLA parts 7 Use the suction device to also clean the flow cell of the MicroDust Pro 8 Check all the O rings and make sure that there are no visible signs of physical damage 9 Re assemble the VAG following the instructions in Sections 3 1 1 and 3 1 2 A ATTENTION If you are switching to another type of powder next session a quick cleaning is not enough You have to completely disassemble the disperser block and perform a deep cleaning A ATTENTION For safety reasons all cleaning procedures should be performed inside a certified ventilated hood 4 2 Deep
23. st download the data files from the internal datalogger of the control unit by selecting Download under menu Comms After the file is loaded you can a Examine the raw data Click on button E or select Table from menu View b Display a summary report Click on button Z or select Summary from menu View c Plot the data Click on button E or select Graph from menu View Windust pro data files dat are saved as comma delimited ASCII text and can also be opened and processed using standard spreadsheet application such as Excel Page 20 of 32 Or CH TECHNOLOGIES USA Inc 3 3 Correction Factor Calibration of Dust Monitor Light scattering instruments exhibit some sensitivity to a particulate s refractive index size shape and color When faced with varying dust types the sensitivity of the instrument will differ slightly due to variations in particulate size refractive index and color The MicroDust Pro s use of a narrow forward scattering angle minimizes these effects but for optimum calibration to a specific dust type gravimetric calibration is required The monitor is factory calibrated with ISO Fine 12103 1 A2 equivalent to Arizona Road Dust For accurate concentration readings of any other particulate the default calibration factor 1 has to be adjusted This is done in one of two ways 1 by sampling in parallel from the inhalation chamber with the MicroDust Pro and the gravimetric sampler and then comparing t
24. top key Use the Left or Right keys to choose the desired Display Averaging interval and press Save key to select it The available intervals are between 1 60 seconds but it is strongly recommended to select between 1 5 seconds since it provides for faster control feedback loop Navigate to Logging Interval menu and highlight it Available intervals range from I second to 60 minutes Choose the desired interval value using Left or Right keys and press Save key to select it Last to set up the I O signal output range press Exit key to go back to the previous screen Navigate to Alarm amp I O Setup icon A and press Run Stop key to activate it On the Alarm amp I O Setup screen navigate to the Analog Output FSD menu and press Run Stop key to highlight it Using Left or Right keys choose the appropriate range and press Save key to select it Page 17 of 32 A 16 Press the Exit key consecutively until you get to the Data screen CH TECHNOLOGIES USA Inc ATTENTION Select for the Analog Output FSD the same range as the Measurement Range Otherwise the VAG will not work properly 3 2 3 Controlling Powder Output during VAG Operation The VAG uses the feedback of the aerosol monitor to control the aerosol output at desired concentration levels The output is controlled by adjusting the Control dial of the VAG l Turn on VAG Controller If you haven t set up the MicroDust Pro follow instructions in Section 3
25. trol Unit When completed the assembly of the VAG without sharp cut cyclone should look similar to Figure 8 AEROSOL GENERATOR DISPENSER WOOEL VAG INA Figure 8 VAG Assembly without Sharp Cut Cyclone Page 12 of 32 Gr CH TECHNOLOGIES USA Inc 3 1 2 2 With Sharp Cut Cyclone l 5 Assemble the provided elbow stainless steel slip joint connector on deagglomerator s outlet and tighten the nut by hand Thread the cyclone inlet to the slip joint connector and tighten the nut by hand Make sure that the body of the cyclone is vertical and its outlet is straight up Slip the inlet compression fitting of the assembled CLA into the cyclone outlet and tighten the nut by hand Insert the provided VAG s outlet connector into the outlet compression fitting of the CLA and tighten the nut Follow steps 5 thru 8 of Section 3 1 2 1 to complete VAG setup When completed the assembly of the VAG with sharp cut cyclone should look similar to Figure 9 Figure 9 VAG Assembly with Sharp Cut Cyclone Page 13 of 32 Or CH TECHNOLOGIES USA Inc ATTENTION It is recommended the use of a ring stand to securely hold the MicroDust Pro in place during operation 3 1 3 Setting Up WinDust Pro Software The Microdust Pro comes with a proprietary data acquisition and analysis software called WinDust Pro There are two ways to record the measurement data they can be stored in the control unit of the probe for later
26. ust Pro during VAG Operation Before starting measurements with the Microdust Pro a zero span check of the calibration status of the probe should be performed The span calibration check is performed using the calibration insert supplied by the factory For step by step calibration check procedures and guidelines on recalibration refer to the Casella Microdust Pro User s Manual supplied with the monitor Enter the results of the calibration check onto the Aerosol Monitor Data Collection Sheet ATTENTION Positive readings during a Zero Check indicate that the monitor s detector lens is contaminated Re zero the probe to zero If zero cannot A be reached it means that the lens is dirty and he probe should be sent to the factory for cleaning and re calibration If you haven t done yet so follow procedures outlined in Section 3 1 2 and 3 2 2 to connect the control unit of the MicroDust Pro to the computer and set up the operational monitoring parameters now 3 2 4 1 Monitoring with the Control Unit 1 Turn the control unit ON and wait until wait until Last Measurement screen appears 2 Press View key to access the Data screen The instrument will display instantaneous values of measured concentrations 3 Press View key again to display a graphical representation of the aerosol concentrations measured over the last 3 minutes Note that the scale of the chart corresponds to the measurement range selected 4 Pressing View key onc
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