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MicroDust Pro Aerosol Monitoring System

1. CASELLA CEL MicroDust Pro Aerosol Monitoring System HB3275 07 User Manual CASELLA MEASUREMENT Regent House Wolseley Road Kempston edford MK42 7JY U K Phone 44 0 1234 844 100 Fax 44 0 1234 841 490 E mail info casellacel com Web www casellameasurement com CASELLA MicroDust Pro Aerosol Monitoring System CEL Contents ODER wsscsssscssevcccnsescsccevencccssscessacaneeeccsostacennanvecesseos seesennencectdosagesenaueetecddeasvesnencasbcesoaseeveesubeatacaeneys 2 1 ge ege BEE A 1 1 Structure of this User Manual een 5 1 2 EE 6 2 AEE E Eege Eed 8 2 1 Control fUNCHONS erdeelt 9 QP eene Siessen onarri o sov EE E EEEE EEN NEE EE a EAEAN 9 2 31 Pars s pplied coionnan a a ar a a E 11 3 Using the instrument essessiissisisrerstotsssissrrrecestessokorsreecetitscbeasrees iteris starete rotko i darse 12 3 1 Preparing the instrument Tor use 12 3 2 Preliminary operations ENEE 16 SG ele e EE 22 Zi Making MGAaSurementS viisissrccseseccccasiiscossedessnnsaascedeesseveseeiaaassecssvssonsea cdsdeosesvsevaandieececsasy 29 3 5 Data EE 30 4 Casella Insight data management SOFWALE cccccsscsssssreccceceecsessseranseceeeceesssesseeees 33 4 1 Installing and starting the software 33 5 Command set for remote control seesesseseeeeesssseeroesesesssoseeecesssesosseeceeesesssseseeseesesssesee 34 5 1 Command X Start real time output REENEN 34 5 2 Command Z Stop real time output REENEN 34 5 3 Command In
2. GE 4 28 mg m3 TWA reading 3 45 mg m meaning the instrument in this example gives readings that are low Correction factor SC 1 24 3 45 27 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Applying the correction factor Adjust the instrument s zero and span settings as described in Adjusting the zero and span settings on page 23 and then follow the steps in Figure 15 Figure 15 Applying the correction factor MAINMENU av ViewGraph View Measurement MicroDust Status Logger Calibration CALIBRATION Ag Set Zero Set Span Set Optical Filter Dust Name DustName OPT 4 DEFAULT DEFAULT 1 LIMESTONE k 1 LIMESTONE set 2 SITE 4 SS 3 SITE 5 4 ROAD STONE SETDUSTNAME 4 I MESTONE Press tosaveand SET CORRECTION FACTOR Note The correction factor for limestone should not be taken as 1 000 It is shown here for illustration purposes only The Default particulate type shown as item o in the DustName list is a factory calibration that you cannot edit or DEFAULT delete Select any of the other entries in the list items 1 SE 1 to 4 to add the new type of particulate 2 SITE 5 4 ROAD STONE You can enter a name for the particulate and you can enter the correction factor that you have calculated for this type of particulate 28 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CE
3. The MicroDust Pro uses a proven forward light scattering principle to make accurate and repeatable measurements of dust concentration It provides the following features as standard e Graphical representation of concentration trends e Internal data logging e A simple and clear user interface e Digital calibration suitable for any dust sampling scenario The Casella Insight data management software application supplied as an option allows you to download and view data from the MicroDust Pro instrument It also offers a real time display of particulate concentration levels measured by the instrument Refer to the on line help system installed with the Casella Insight data management software for full instructions to use this software application Principle of operation The MicroDust Pro instrument uses a modulated beam of infra red light projected into a measurement chamber 4 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Figure 1 Sampling probe 1 2 1 Infra red emitter 2 Sample volume 3 Infra red detector 4 Light stop Under clean air conditions all light is prevented from reaching the received by a light stop 4 When dust particles enter the sample volume 2 the beam of infra red light is scattered within a narrow angle 12 to 20 to the receiver 4 By using a narrow angle of scatter the instrument is made less sensitive to variations in the refractive index and colour of measured part
4. RS232 receive in 4 Black 2 Rx in RS232 transmit out 5 Blue 5 Ground Comms ground 4 DTR 8 CTS 6 DSR Linked together The analogue output signal has a full scale range of 0 to 2 5 volts and an output impedance of approximately 500 The full scale output voltage is proportional to the full scale indication of the active range For example if the active range is O to 25 mg m3 and output signal of 2 5 volts represents a dust concentration of 25 mg m3 meaning the analogue output is scaled at 1 mV per 0 01 mg m3 IMPORTANT The analogue output is available only when using a fixed measurement range that is when NOT using Auto Range Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 2 3 Parts supplied Figure 3 MicroDust Pro installed in the carry case 1 2 3 4 5 6 weie Duterte osd ISA NOIN 70101 Reeg Parts supplied as standard with the MicroDust Pro are as follows e The MicroDust Pro control unit 1 e The MicroDst probe 2 e Four AA size rechargeable battery cells 3 e The PCi8 mains DC adaptor 4 e Acalibration filter 5 e The purge bellows 6 e The carry case with shaped protective foam insert e RS232 lead e User manual 11 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 3 Using the instrument
5. Table 2 Servicing hints perform the servicing hint listed below return the instrument to Casella CEL for repair Fault symptom Possible cause Service hint The instrument does not switch ON Battery is discharged or does not charge confirm whether the charge indicator comes on when you connect the charge Recharge the batteries or fit new batteries if necessary Use an external power supply The probe always reads zero A fault may exist on the infra red transmitter or receiver Check the probe connection There is a continuous over range indication Optical misalignment due to mechanical shock Excessive contamination Return the instrument to Casella for optical alignment cleaning and re calibration Zero is unstable or drifts when the probe collar covers the sampling chamber Sample chamber contamination by dust or fibre Follow the technique in section 8 1 Lens contamination to clean the sample chamber Follow the technique in Zero adjustment on page 23 A probe contamination Optical misalignment due to Purge the probe with clean air message is displayed mechanical shock from the bellows pump Excessive contamination 48 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 9 Servicing and Warranty arrangements 9 1 Inspection and test To make certain the MicroDust Pro instrument conforms to its publish speci
6. CASELLA MicroDust Pro Aerosol Monitoring System CEL Step 5 of Figure 13 shows how to purge the probe with clean air Slide the collar over the probe inlet leaving only a small hole from which the air can escape Attach the purge bellows to the probe and rapidly squeeze the bulb five or six times This action injects clean air into the chamber and removes possible contamination that may have settled on the optical components inside the probe When you perform this operation you may see the indicated concentration increase and then decrease towards zero Allow a few seconds for automatic ranging and for the reading to stabilise If the reading does not stabilise squeeze the bulb five or six times and try again Press the Enter key el when the reading is stable This sets the reading to zero one digit If the reading is not zero wait a few seconds and then press the Enter key again until it is zero IMPORTANT If the instrument cannot zero itself in the range 0 to 2 5 mg m it displays a Contamination Warning message and selects the 0 to 25 mg m range This becomes the lowest usable range that the instrument makes available until the probe is cleaned For accuracy and stability you should arrange for cleaning to be done by Casella CEL After you have set the zero make sure you fit the rubber cap on the probe purge inlet Span adjustment The basic settings for span or sensitivity for the MicroDust Pro instru
7. accessories 176086B 12 V DC charging lead for use in a car 180043B Extension cable for sampling probe 10 metres 7 4 Standards compliance The MicroDust Pro instrument complies with EMC Directive 89 336 EEC of the European Union It has been tested according to the standard delivery schedule and complies with the following standards EN 50081 1 1992 Generic emission standards for residential EN 50081 2 1993 commercial light industry and industrial environments EN 50082 1 1992 Generic immunity standards both for RF fields and EN 50082 2 1995 for electrostatic discharge for residential commercial light industry and industrial environments EN 61000 4 2 1995 Electromagnetic compatibility EMC IEC 61000 4 2 1995 Testing and measurement techniques Electrostatic discharge immunity test 45 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 8 Maintenance and Servicing Casella CEL has an in house service department that provides a complete range of repair and calibration services for products manufactured by Casella Please contact the service department at the Bedford Headquarters for details of the full range of services available To return equipment for repair pack it properly into the original packing materials or a good equivalent and send it fully insured and pre paid to the following address Casella CEL Service Department Regent House Wolseley Road Kempston Beds MK42 7JY
8. attach the instrument to a suitable tripod available from Casella CEL 15 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 3 2 Preliminary operations Switching the instrument ON and OFF 1 Press the power ON OFF key O to switch the MicroDust Pro instrument ON The instrument displays a welcome screen and then shows the measurement display 1 2 1 Icon to show current battery A A IN charge 2 Icons to show which navigator keys are currently active and v 0026 mg m 4Max 1 826 4Ave 6 Cal DEFAULT gt When the instrument is first switched on the measurements may drift by a small amount Allow the instrument to settle for one minute before you begin using the measurements Before you start making measurements you should check that the zero and the span sensitivity settings are correct and you should calibrate the instrument for the type of particulate to be measured Refer to Calibrating the instrument for a specific type of particulate on page 25 for instructions to make these checks Press the left hand navigator key 4 to reset the maximum and the average levels Press the up or the down navigator keys to display a profile graph of the current particulate concentration 1 Current value Graph time base Press the right hand navigator key to cycle through the options 100 seconds 200 seconds 15 minutes 60 minutes Press the up or th
9. you are working CAUTION Use the MicroDust Pro instrument only as instructed in this User Manual Do not use the instrument for any purposes for which it has not been designed CAUTION The MicroDust Pro is a precision instrument Always handle it with care Do not use the instrument if it has been damaged Refer to section 9 Servicing and Warranty arrangements on page 49 for instructions to follow if the instrument has been damaged or has developed a fault CAUTION The MicroDust Pro can operate from a battery power supply e Use only batteries of the correct type and do not mix battery types in the instrument Refer to Battery supply on page 13 for advice about battery types e Do not try to charge non rechargeable batteries e Do not leave discharged batteries in the MicroDust Pro instrument e Install new batteries as a complete set Do not fit batteries that have a mixed state of charge Refer to How to fit new batteries on page 14 for instructions to install batteries e Remove all batteries from the MicroDust Pro instrument if you will not use the instrument for a long time e Always follow local regulations to dispose of used batteries 6 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL A A CAUTION The MicroDust Pro instrument is not waterproof Do not immerse the instrument in water or use it in the rain CAUTION Do NOT use solvent based cleaners to clean the MicroDust Pro instr
10. 3 O rings 7 MicroDust sampling probe The basic design of the TSP and respirable adapters is the same but with different inlet fittings The respirable adapter is a centrifugal separator that uses the cyclone principle of dust separation It draws only the respirable fraction of particulate matter through the measurement chamber and onto the filter D50 cut 4 um at 2 2 litres minute 38 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL The cyclone 10 is fitted to the adapter block 2 using an O ring seal A suitable constant flow pump such as the Casella TUFF or Apex should be connected to the filter cassette 12 through a length of silicone tubing It is important that the cyclone must operate in the vertical orientation You should also clean the coarse dust container 11 and check it for damage at regular intervals When you install a new filter in the filter cassette make sure it is held firmly against the filter support pad If the filter is loose the instrument will give incorrect measurements When the cyclone is pressed into the adapter block make sure the cyclone s locating spigot 9 engages the probe inlet so that the adapter assembly cannot rotate or slide on the sampling probe Use the thumb screw to secure the adapter assembly in position PUF filter adapter The MicroDust polyurethane foam filter PUF filter adapter is for use in DM respirable and PM sampling applications that have a fl
11. Casella Insight data management software Setting the Measurement Range Set the MicroDust Pro instrument to a suitable range for the expected particulate concentration or set the instrument to select the range automatically Figure 9 Setting the measurement range MAINMENU av View Graph a View Measurement MicroDust Status Logger Calibration Configuration CONFIGURATION v DUST INPUT RANGE e Auto Range gt Auto Scale 2 500 mg m Lock Range Range BEATE 25 00 mg m Graph Lock Range 250 0 mg m 250 0 mg m 2500 mg m 4 The scale used for the displayed graph can be changed Set the Graph option to Lock Range to fix the scale to be the same as the fixed measurement range Set the Graph option to Auto Scale to display only the range between the current maximum and minimum measurements Setting the Averaging Time You can set the averaging time that the instrument uses on measurements and the analogue output 19 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Figure 10 Setting the Averaging Time MAINMENU av ViewGraph Pa View Measurement MicroDust Status CONFIGURATION AVY Measuring Range Averaging Time Pa Configuration Lo BO sec gt AVERAGING TIME ce Average Sec Ze Analogue Ave Alarm Status KL OFF ON Alarm Level Alarm Reset if 0 2500 2 Keypad 4 Auto The displayed particulate concentration is a rolling average
12. L When you use the instrument to measure this type of particulate again select the appropriate type from the list so the stored correction factor is applied automatically to the measured values 3 4 Making measurements Before you make a measurement perform the following tasks e Adjust the instrument s zero and span settings refer to Adjusting the zero and span settings on page 23 e Apply the appropriate correction factor refer to Applying the correction factor on page 28 e Set an appropriate averaging time for the application refer to Setting the Averaging Time on page 19 1 Open the probe collar fully to expose the measuring chamber 2 Move the probe slowly through the aerosol or rely on natural air movement to allow the aerosol into the measuring chamber You can make measurements with the probe clipped to the control unit or you can unclip the probe to allow easy access to confined spaces For static monitoring applications use an aspirator system if possible refer to section 6 2 Aspirator unit on page 41 for information about the optional aspirator systems 3 Make the required measurements for the application refer to Measurement types below Measurement types In addition to the basic real time measurements of particulate concentration the MicroDust Pro instrument can also calculate and display other useful data Maximum value Max This represents the maximum pa
13. LLA MicroDust Pro Aerosol Monitoring System CEL You should also carry a spare set of batteries How to fit new batteries Before you begin Read the caution notice about Batteries on page 6 You should fit new or fully charged batteries into the instrument before you start a set of measurement Fitting the batteries If necessary press the power ON OFF key to switch the instrument OFF Figure 5 Fitting new batteries 1 Lift and slide the battery cover towards the bottom of the instrument and lift the end to release the cover 2 Remove the four exhausted batteries from the battery compartment and fit new ones observing the correct polarity 3 Press the power ON OFF key and check the battery symbol shows the batteries have a good charge Mains DC supply If you need to operate the instrument for a long period you should operate the instrument from a Casella PC18 DC power supply if possible This avoids the run being interrupted by battery failure When you use a DC power supply to operate the MicroDust Pro the instrument can operate without batteries installed 14 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL USB supply When you connect the instrument to a PC through a USB cable the instrument receives power to operate at 5 V DC from the PC There is no need to use a mains DC power supply to operate the MicroDust Pro instrument when you connect it to a PC Battery con
14. The MicroDust Pro is a sensitive scientific instrument that must be protected against excessive moisture vibration and physical shock Follow the instructions in this User Manual carefully to avoid causing damage to the instrument This section of the manual describes the tasks you must perform to make the MicroDust Pro instrument ready to make measurements You should try to complete the tasks in the sequence they are included e Preparing the instrument for use e Preliminary operations e Calibration IMPORTANT For optimum accuracy you should always perform a user calibration to correct your instrument for the type of particulate to be measured Refer to Calibrating the instrument for a specific type of particulate on page 25 for instructions to do this e Making measurements e Data logging 3 1 Preparing the instrument for use A Setting the DIP switches WARNING DO NOT enable the charger circuit while there are non rechargeable batteries installed in the MicroDust Pro instrument The MicroDust Pro instrument has a built in fast charging circuit that uses power supplied by the 12 V DC supply This allows you to recharge suitable rechargeable batteries without the need to remove them from the instrument Before you can use this feature you must set the Charger Enable DIP switch to the ON position as shown by item 2 in Figure 4 The DIP switches are located in the battery compartment If you use non rechargeabl
15. United Kingdom IMPORTANT Include a letter that gives full list of the package contents together with details of any repair work needed fault conditions or servicing requirements for the instrument For servicing outside the United Kingdom return the instrument to the appointed distributor 8 1 Lens contamination In common with all items of optical equipment the MicroDust Pro instrument s lenses can become contaminated with particulate matter that settles on exposed surfaces Over time this can reduce the instrument s accuracy or can make it difficult for the instrument to give a stable zero reading The optical chamber and lens arrangement on the MicroDust Pro have been designed carefully to reduce the need for cleaning However to extend the serviceable life of the instrument you should perform this task after each measurement operation Cleaning the lens 1 Attach the air purge bellows to the probe s purge inlet 2 Move the probe collar to open the sampling chamber 3 Pump vigorously to blow clear any dust or contamination on the lens surface 46 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Continuous purge technique For long term sampling or where you expect to make measurements in high concentrations of contamination you should use a continuous source of dry filtered air to purge the measurement chamber Use one of the pumps from the Casella TUFF or Apex series for this purpose Mai
16. Y ViewGraph Measuring Range View Measurement Averaging Time MicroDust Status Back Light Time amp Date Language SerialComm s gt Light OFF Light ON BACK LIGHT ON TIME Light OFF Duration 25sec BEER Buzzer Disable 5 05 30 sec gt Enable Disable Mode Light ON switches the backlight ON The backlight remains ON until you switch it OFF Light OFF switches the backlight OFF In this mode the backlight remains OFF until you select a different mode The Keypress option switches the backlight ON for a short duration when you press any key Note that using the backlight reduces the battery life Duration Set the backlight s duration after each keypress 21 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Buzzer Enable the buzzer to hear a short tone when you press any key Setting the serial communications Connection between the MicroDust Pro instrument and a PC is through a serial RS232 communications link Figure 12 Setting the serial communications MAINMENU 4 ViewGraph Pa View Measurement Averaging Time MicroDust Status Back Light Logger Time amp Date 1 Calibration Languag Configuration SerialComm s CONFIGURATION av Measuring Range e RS232 IrDA z gt 600 Serial Comms lt 1200 2400 9600 14400 19200 28800 38400 3 3 Calibration Before you make any measurements with the MicroDust Pro you should confirm t
17. and R Set instrument ID time and date A This command enables you to set the time date and two ID strings remotely This information is displayed on the instrument s status screen CAUTION All records stored in the instrument are erased when you use this command Transmit the command R and then wait to receive a response D from the instrument before you transmit the data string Example Transmit R Wait to receive D Transmit the data string 35 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL CasellaCEL 01234 844100 K 28 07 03 12 30 CR LF e The maximum ID string length is 16 bytes e The date format is dd mm vyy e The time format is hh mm using the 24 hour format 5 6 Commnd B Upload a bitmap to the instrument This command enables you to upload a 128 x 64 pixel bitmap that the instrument uses as a splash screen when you switch the instrument ON You can use this feature to include a special logo or other screen The first byte of the bitmap forms the top left corner of the screen Example Transmit B Wait to receive D Transmit the bitmap string 5 7 Command C Clear bitmap This command restores the instrument s default splash screen 5 8 Command i Screen dump The screen dump tells the instrument to transmit binary data to the PC that represents the screen that the instrument is displaying currently The first byte transmitted is for the top le
18. ates with the carriage return line feed characters ASCII characters oxoA oxoD Example 2 87 lt CR gt lt LF gt 2 55 lt CR gt lt LF gt 2 60 lt CR gt lt LF gt 5 2 Command Z Stop real time output The instrument stops transmitting the real time data output 5 3 Command interrogate target The instrument transmits a comma delimited string of characters that contain two ID strings e The first ID string is the number of records stored in the logger e The second ID string is the firmware version of the instrument 34 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Example CasellaCEL 01234 844100 K 11 80 176087AXX lt CR gt lt LF gt 5 4 Command T Download records stored The instrument downloads all records stored in its internal memory to the PC Example Log close 28 07 03 12 13 48 129 396 129 445 28 07 03 12 13 42 O CR LF 28 07 03 12 13 48 129 361 1 CR LF 28 07 03 12 13 46 129 387 2 CR LF 28 07 03 12 13 44 129 439 3 CR LF Log close 28 07 03 12 11 30 240 920 240 947 28 07 03 12 11 22 4 CR LF 28 07 03 12 11 30 240 882 5 CR LF 28 07 03 12 11 28 240 909 6 CR LF 28 07 03 12 11 26 240 897 7 CR LF 28 07 03 12 11 24 240 920 8 CR LF 28 07 03 12 11 22 240 937 9 CR LF 28 07 03 12 11 20 240 935 10 CR LF 28 07 03 12 11 18 240 943 11 CR LF 28 07 03 12 11 16 240 935 12 CR LF 5 5 Comm
19. dition indicator When the MicroDust Pro receives power from a mains DC power supply or from a USB port on a PC the battery condition symbol on the instrument s screen always shows a fully charged battery condition even if the batteries are not fully charged Sampling probe IMPORTANT The instrument may give reading errors when you use it in very bright or changing ambient light conditions This is because the measurement method depends on the scattering of infra red light You should exercise care when you use the instrument in direct sunlight Shield the probe from direct light sources You can use an aspirated or gravimetric adaptor or use the MicroDust Pro within the environmental enclosure to reduce the effects of ambient light The detachable sampling probe houses the measurement chamber together with the associated optics including the infra red emitter and receiver Connect the sampling probe by aligning the red dot on the connector to face forward on the instrument and insert the connector into the socket at the top of the instrument To disconnect the sampling probe CAUTION DO NOT pull on the cable to disconnect the sampling probe To disconnect the sampling probe pull outwards on the connector s knurled sleeve in the direction of the arrows shown in Figure 2 You can un clip the sampling probe from the control unit for hand held operation Supporting the instrument For general monitoring applications you can
20. e batteries to operate the instrument it is very important to set the Charger Enable DIP switch to the OFF position 12 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Figure 4 Location of DIP switches Boot mode DIP switch normally in the OFF position Charger enable switch Supporting clamp for the probe Serial number label Kat EE Charging stops automatically when the batteries have received a full charge This can take approximately three hours when charging batteries from a fully discharged condition Powering the instrument The options for powering the instrument are as follows e Batteries Note that the rechargeable batteries supplied by Casella will be in a discharged state To obtain maximum capacity from the new batteries you may have to give them several charge discharge cycles e 12 V DC adaptor Casella part number PC18 e USB connection Battery supply You can use alkaline or rechargeable AA batteries to operate the instrument Do not use a mixture of alkaline and rechargeable batteries at the same time The operating time that you can expect from a fully charged or new set of batteries depends on the battery capacity and whether you use the instrument s backlight Environmental conditions such as the ambient temperate also affect battery life See section 7 Specifications beginning on page 42 for some typical battery life examples 13 Casella CEL CASE
21. e down navigator key again to return to the measurement display Press the power ON OFF key to switch the MicroDust Pro instrument OFF 16 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Checking battery status and firmware version The instrument displays the internal battery voltage on the Status screen together with the installed firmware version Switch the instrument ON see page 16 and wait until it displays the measurement screen Figure 6 Checking battery status and firmware MAINMENU A 24 Jun 18 18 25 ViewGraph Battery 4 9 Volts View Measurement Memory 2 Full MicroDust Status Runs 1 32 Logger Version NN NN N Calibration User Name and Configuration Details gt 48V 100 lt 42V 20 ven EI lt 1 o ZE 4A Battery status IMPORTANT Ignore the battery voltage displayed on the Status screen when you use a mains DC power supply to operate the instrument The batteries are in a fully charged condition when the battery voltage displayed on the Status screen is 4 8 V or more If you are using rechargeable batteries and the battery voltage displayed on the Status screen is less than 4 2 V less than 20 of the battery capacity remains You should consider recharging the batteries when this condition occurs The battery icon flashes when the internal battery is almost fully discharged When the batteries become discharged the instrument stops logging and begins to shut dow
22. ead cap 4 PUF filter holder DM 10 Filter cassette 25 mm 37mm 5 PUF filter holder PM Respirable 11 O rings 6 37mm to 25 mm reducer To insert or remove PUF filters from their filter cassettes use clean tweezers and vinyl gloves Do not allow the filters to become damaged creased or folded in any way Spare PUF filters are available from Casella CEL e PM2 5 foams packs of 10 P N P118204 e PMio foams packs of 10 P N P118206 e Respirable 2 foams packs of 10 P N P118208 40 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 6 2 Aspirator unit The fan driven aspirator unit shown in Figure 22 can be used to draw all suspended particulate matter through the probe provided there is no back pressure Figure 22 Aspirator unit E i Gas va 8 8 2 3 8 4 5 7 1 Fan aspirator 5 Thumb screw 2 Adapter block 6 MicroDust sampling probe 3 Locating spigot 7 Measuring chamber inlet 4 Inlet tube 8 O rings The fan aspirator 1 and the inlet tube 4 are push fitted into the adapter block 2 When assembling these units it is important to prevent damage to the O rings The complete aspirator unit is located and secured to the sampling probe 6 with the locating spigot 3 engaging the measuring chamber inlet 7 41 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL The aspirator fan operates from a 5 V DC power supply which can come from a suitable mains DC adap
23. er warranty the instrument should be packed and returned in its original packing or an equivalent either to CASELLA CEL s local agent or in the case of UK domestic sales to the CASELLA CEL Service Department at Bedford Please include the following information Instrument type s Serial number s and Firmware version number s Customer name and address Contact name and phone number s details of any PC and software involved including version number s Reason for returning the equipment with a detailed description of the fault and a list of any error messages that may have been displayed The necessary adjustments will be carried out and the instrument returned as soon as possible After the warranty has expired except on approved accounts service work is undertaken against quotations and all packing and transit costs are charged extra 49 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 9 3 User servicing There are no user serviceable components inside the MicroDust Pro instrument or the sampling probe DO NOT open the instrument or the probe to attempt repairs You will cancel the warranty if you attempt to open the instrument or the probe for any reason If you suspect the instrument has developed a fault contact your local Casella CEL agent to arrange for service and repair 50 Casella CEL
24. esseecesecesssesessseesses 49 9 1 INSPECTION ue 49 g Watranty period 220 scicessssdeevessauaseessevgssusazauenaetouecsdeszaeeas soceceeageveuenaenedesbeadapsueonevesccuadese 49 3 User SERVICING ssiss cncdescecscsssscevsedecssaastensvendeuansaneseecveeessavensiedesucessebeuaelscdesescavernyeneveseesssovas 50 3 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 1 Introduction The MicroDust Pro instrument measures the levels of particulate matter such as dust smoke fumes pollen and other aerosols from combustion materials processing manufacturing energy generation vehicle engine emissions and construction Pollutants of this type reduce visibility spread contamination and can cause illness and low worker productivity from the inhalation of toxic substances Many of them are also recognised as contributory factors to many chronic and acute medical conditions including asthma bronchitis and lung cancer The MicroDust Pro instrument is not like traditional gravimetric methods of dust measurement which require a significant sampling period and are not suited to the real time evaluation of trends in concentration levels The MicroDust Pro is an ideal survey instrument for the assessment of real time particulate concentration in mg m3 It is totally portable and has a detachable probe that allows operation in relatively inaccessible areas making it suitable both for fixed site and for general survey applications
25. factor is applied If the probe becomes heavily contaminated after calibration the instrument displays a warning message and disables the contaminated measurement ranges Setting the optical filter Figure 14 Set the Optical Filter MAINMENU av CALIBRATION av View Graph View Measurement MicroDust Status Set Optical Filter Logger User Dust Types Restore Default CAL Calibration SET OPTICAL FILTER RG op Setvalueshownon Calibration filter Calibrating the instrument for a specific type of particulate Gravimetric calibration The measurement sensitivity of the MicroDust Pro varies according to the properties of different types of particulate that it is measuring This is a common characteristic of all instruments that use light scattering methods for measuring particulate concentration 25 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL The MicroDust Pro instrument s use of a narrow forward scattering angle minimises these effects but for optimal accuracy when measuring a specific particulate type you should perform gravimetric calibration Optional gravimetric and respirable adapters incorporate 25 mm or 37 mm filter cassettes and provide a convenient method of gravimetrically calibrating the MicroDust Pro instrument Refer to section 6 1 Gravimetric adapters on page 37 for information about these adapters Standard gravimetric techniques can be used to provide a c
26. fication the instrument is tested thoroughly and its accuracy is verified before shipment from the factory All technical information about each individual instrument is filed under the instrument s serial number which you should include in any correspondence concerning this instrument 9 2 Warranty period To ensure conformity with the specification this instrument is thoroughly inspected and its accuracy verified prior to dispatch All technical information is filed under the instrument serial number which should be quoted in any correspondence The manufacturer undertakes to rectify any defect in the instrument directly attributable to faulty design or assembly and which becomes apparent during the warranty period In order to take advantage of this warranty the instrument must be returned carriage paid to the manufacturer s factory or accredited agent where necessary repairs will be carried out The warranty period runs for 24 months from the date of receipt of goods with exceptions on certain specialised components supplied by other manufacturers that may be warranted for shorter or longer periods by their actual manufacturers In all such cases the benefit of these undertakings will be passed on to the user CASELLA CEL s liability is limited to items of their own manufacture and they do not accept liability for any loss resulting from the operation or interpretation of the results from this equipment To obtain repair und
27. ft corner of the screen The screen dump command cannot be used at intervals shorter than 2 seconds This delay is necessary to allow the data to be transmitted successfully 36 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 6 Sampling Accessories When you use the MicroDust Pro instrument in static monitoring applications you should use some form of aspiration with the sampling probe This can be either a TUFF or Apex sampling pump or a fan aspirator By maintaining an air flow through the sampling probe you can eliminate possible errors caused by the orientation of the probe s inlet and size selectivity The gravimetric and respirable adapters include 25 mm or 37 mm filter cassettes and provide a convenient method of calibrating the instrument 6 1 Gravimetric adapters The gravimetric adapter units draw particulate matter through the sampling probe s measuring chamber and deposit it on a 25 mm or a 37 mm filter There are three gravimetric adapter options available e Total Suspended Particulate TSP All sampled particulate is monitored in real time and then deposited onto a sample filter The design does not allow selection based on particulate size e Respirable 4 pm The respirable adapter design includes a Cyclone size selective unit This means that only respirable particulate passes through the sampling probe and is deposited onto the filter e Polyurethane Foam Filter PUF The PUF gravimet
28. ftware includes a plugin for the MicroDust Pro instrument family The Casella Insight data management software supports the following Instrument configuration Data downloading Data management and analysis Reporting functions The software runs on a PC that meets the following minimum specification Operating System Processor 1 3 GHz Windows XP Service Pack 2 RAM 1GB Windows Vista Service Pack 1 Free Disk Space 1GB Windows 7 Refer to the Casella Insight data management software s on line help for a complete description of the various features of the software can display and for instructions to use the software with the MicroDust Pro instrument This section of the manual explains how to do the following tasks Install the Casella Insight data management software on a PC Start the Casella Insight data management software Access the on line help system 4 1 Installing and starting the software Note You should perform the installation procedure while operating the PC under administrator privileges 1 2 Insert the CD that holds the software into the PC s CD ROM drive If the software does not start to install automatically use Windows Explorer to display the contents of the CD and double click the Insight folder then double click the setup exe file on the CD Wait until the Casella Insight Welcome screen is displayed and then follow the on screen instructions When the installation process gives you a
29. h saved record includes a reading of the average concentration 31 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL measured during the relevant logging interval and the date and time when it was saved At the end of each logging run that is when logging stops or the instrument is switched OFF the instrument also saves a summary record The summary record identifies the average the maximum and the minimum particulate concentrations that the instrument has measured during the entire run It also shows the date and time when the maximum measurements were recorded Data stored in the instrument s internal memory can be downloaded to a PC running the Casella Insight data management software Refer to the software s on line help system for full instructions to use the Casella Insight data management software Viewing stored runs Figure 19 Viewing stored runs MAINMENU av ViewGraph View Measurement MicroDust Status Logger Calibration LOGGER AT Start Logger View Runs a Config Logger Start Date 18 Jul1d Time 16 18 57 Duration 41 29 44 Ave Value 4 37 Max Value Ob D A You can view stored runs while you are logging the current run Use the or e keys to cycle through and display the stored runs 32 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 4 Casella Insight data management software Casella CEL s Insight data management so
30. hat it is set correctly for zero and that its span control sensitivity is adjusted correctly To gain optimal measurement accuracy you should also perform a user calibration to correct the instrument for the type of particulates to be measured 22 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Adjusting the zero and span settings Figure 13 Adjusting the zero span settings MAINMENU av View Graph View Measurement MicroDust Status Logger Calibration CALIBRATION AT Set Optical Filter User Dust Types Restore Default CAL CALIBRATION 4v Set Zero Set Span Set Optical Filter User Dust Types Restore Default CAL 0201 mg m Purge Probe until stable Press _toZera 4 C gt 2222mg ms TS D i 5 LOBA mg m a Insert Calibration FilterandPress Filter Ref 25 2 8 Refer to Calibrating the instrument for a specific type of particulate on page 25 for instructions to calibrate the instrument for a specific type of particulate Zero adjustment For sensitive measurements that will use the o to 2 5 mg m3 or the o to 25 mg m3 ranges it is important to purge the probe with clean air before making zero adjustments or measurements Fine dust particles in the probe assembly may never settle even when the probe collar covers the inlet chamber 23 Casella CEL
31. iculate 1 1 Structure of this User Manual The structure of this User Manual is designed to help you find the information and instructions you need to complete a task easily Refer to section 3 Using the instrument on page 12 for instructions to use the MicroDust Pro instrument To help you find the information you need quickly in the electronic version of this User Manual it includes clickable links The links appear as blue underlined text You can also click the names of chapters and sections in the bookmark panel and in the table of contents to jump to that part of the manual 5 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 1 2 Safety A The MicroDust Pro instrument does not present a safety risk when you use it as instructed in this User Manual However it is possible that the environment where you use the instrument may present a safety risk and you must ALWAYS follow correct safe working practices WARNING Always be aware of the risks in the environment where you are working e The MicroDust Pro instrument is NOT intrinsically safe DO NOT use it in an atmosphere where explosive vapours or dusts might exist e Wear an approved dust mask when making measurements in dusty environments e Wear approved protective clothing and footwear suitable for the environment where you are making measurements e Always follow local safety regulations and be aware of risks in the area where
32. ion over time You can select the timebase for periods of 100 seconds 200 seconds 15 minutes or 60 minutes The Y axis can be set to a fixed range or can be auto ranging The instrument is factory calibrated using traceable isokinetic techniques and ISO 12103 1 A2 Fine test dust Arizona road dust equivalent Four user defined calibration settings are available to suit specific types of particulate or particular monitoring applications The instrument s software provides an easy calibration routine for zero and span settings The instrument allows confirmation of the factory calibration point by using an optical reference filter 64K EEPROM providing capacity to store more than 15700 data points 21 hours 48 minutes 10 days 21 hours Adjustable from 2 seconds to 600 seconds 44 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Recorded values Average concentration over logging interval Maximum and average values for the entire logging period are saved at the end of each logging run Serial interface RS232 in discrete steps up to 38400 baud IrDA expansion capability Analogue output o V to 2 5 V DC FSD 500 Q output impedance Digital output available only when the alarm is selected refer to Alarm on page 20 Alarm ON 2 5 V Alarm OFF oV 7 2 Maintenance The instrument requires cleaning by the factory annually or more frequently under severe measuring conditions 7 3 Optional
33. ment are set at the factory using ISO Fine 12103 1 A2 calibration dust Each probe is supplied with its own calibration filter which creates a fixed optical scattering effect in the sampling space This fixed reference can be used to confirm the factory calibration point for the instrument and probe It is important to use only the optical filter supplied for use with the specific probe IMPORTANT It is important to use only the optical filter supplied for use with the specific probe The reference value for the calibration filter supplied 2 5 BE ae for the probe is shown on the filter and is displayed Reeser nein at the bottom of the Set Span screen Eiter and Dress Insert the calibration filter into the measurement chamber with the arrow pointing towards the probe s handle Filter Ref 25 2 24 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Press the Enter key el and wait a few seconds to allow the reading to stabilise The display should show a reading within 1 digit of the value shown on the calibration filter to confirm that the factory set sensitivity of the instrument has not changed If the correct value is NOT shown for example because the instrument was last used with a different probe and filter follow the steps in Figure 14 to set the optical filter The span adjustment calibration described here is an absolute calibration of the instrument It remains valid when a correction
34. n automatically Firmware version The Status screen shows the version of firmware installed in the instrument You will need this information if you call the Casella CEL service team for technical support Setting the display language Set the language that the instrument uses for menus 17 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Figure 7 Setting the display language CONFIGURATION av MAINMENU av ViewGraph Measuring Range View Measurement Averaging Time MicroDust Status BackLight Logger Time amp Date 1 Calibration Language SerialComm s SELECTLANGUAGE AY English Fran aise Deutsch Italiano Espanol Nederlands 4 Setting the Date and Time The instrument uses information from its internal real time clock to log measurements against the current date and time Figure 8 Setting the Date and Time MAINMENU 4 CONFIGURATION av ViewGraph a Measuring Range View Measurement Averaging Time MicroDust Status BackLight Logger Time amp Date 1 Calibration Language Configuration SerialComm s TIME amp DATE Wed 14 March H 14 59 26 SetTime i SET DATE Set Date Wednesday 4 14 March Hp 18 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL The MicroDust Pro instrument synchronises its internal real time clock with the PC s clock when you connect the instrument to a PC running the
35. n option choose the default settings When the installation finishes a new Insight icon is displayed on your PC s desktop Double click the Insight icon to start the software 33 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Press the PC s F1 function key to display the software s on line help system which tells you how to use the software with the MicroDust Pro instrument You should refer to the on line help for all instructions to use the software 5 Command set for remote control The MicroDust Pro instrument can be controlled remotely from a PC that is running a simple terminal emulation program for example HyperTerminal Connection between the instrument and the PC is through the serial data cable supplied with the instrument Refer to Signals on page 10 for information about the instrument s serial connection port Communication occurs using a baud rate that can vary from 600 baud to 38400 baud The RS232 serial communication parameters are fixed at using 8 data bits 1 stop bit and no parity You can use a range of single letter command to control the instrument These commands mimic the action of the keypad buttons allowing remote access to the entire menu structure 5 1 Command X Start real time output The instrument transmits the average particulate measurement as it is displayed on the screen The measurement updates at intervals of 1 second Each transmission termin
36. ntain a flow rate into the purge inlet at approximately 10 of the main sample rate When you use continuous purging you must draw the aerosol sample through the measurement chamber by using an aspiration technique If you do not do this the clean air used for purging will prevent entry of particulate matter If the lens becomes so heavily contaminated that this technique does not clean it you must return the instrument to Casella CEL for cleaning and re calibration Note that the instrument warranty does NOT cover this operation or general servicing of the instrument 8 2 General maintenance e Usea clean slightly damp cloth to wipe the outside of the MicroDust Pro instrument Do not use abrasive caustic or solvent materials to clean the instrument e Check the condition of the battery compartment when you fit batteries to the instrument Check for signs of corrosion and arrange any repairs necessary e Remove the batteries from the instrument if it will not be used for a long period of time more than one month e Do not allow the instrument to become wet 47 Casella CEL MicroDust Pro Aerosol Monitoring System 8 3 Servicing hints CASELLA CEL There are no user serviceable parts inside the MicroDust Pro instrument or sampling probe DO NOT open these items Repairs should be performed only by authorised engineers IMPORTANT If you suspect the instrument has an electrical fault or if a fault persists after you
37. of measurements taken over the averaging time that you set In some applications where aerosol concentrations change rapidly you can improve measurement stability by setting a longer averaging time Analogue output type The analogue output type is optional Choose from the following options Raw The analogue output is taken directly from the signal conditioning circuit and is normalised to match the Instrument e measurement range Average The analogue output is calculated using the averaging time you have set for the instrument Alarm The output voltage represents a set digital value where 2 5 V is Alarm ON and o V is Alarm OFF Alarm If you set the Alarm option to ON you can set the following options Alarm Level Set the alarm trigger level as xxx xx mg m3 Press and hold the or 4 key to change the setting quickly 20 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Press the keys briefly to make small changes This mass concentration level is taken from the Average reading you have selecting in this menu When the concentration level is equal to or greater than the alarm level the instrument triggers the alarm Alarm Reset Auto resets the alarm when the concentration falls below the alarm level for longer than 5 seconds Keypad resets the alarms when you press any key Setting the Backlight and Buzzer Figure 11 Setting the backlight and buzzer options MAINMENU av CONFIGURATION AV
38. ory is full Clear Memory To clear the memory manually select YES and press the Enter key The instrument displays a warning message to confirm the deletion Press the Enter key again to confirm the operation and clear the memory Note that this operation deletes all the stored runs 30 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Start logging Configure the data logging function and if necessary clear the memory before you start logging Figure 17 Start logging MAINMENU AY View Graph Start Logger View Measurement View Runs MicroDust Status Config Logger Logger Calibration OP 212 15 25 32 OP 212152532 3 0 A26 mg m3 4Max 1 886 4Ave 006 I Cal DEFAULT i 7 Heer After you start logging the instrument shows a measurement screen or a measurement graph Press the or keys to switch between these screens Both screens show the run and the current interval number You can view data stored for the current run or for other stored runs while the instrument continues to log data Refer to Viewing stored runs on page 32 for instructions to view runs stored in the instrument s internal memory Stop logging Figure 18 Stop logging MAINMENU av LOGGER av View Graph Stop Logger A View Measurement View Runs MicroDust Status Config Logger Logger Calibration 2 3 When you stop logging the instrument saves data up to the last completed interval Eac
39. ow rate of 3 5 litres minute The design is based on the Conical Inhalable Sampler CIS which is identified in the Health and Safety Executive s publication MDHS14 For monitoring applications the adapter is fitted to the sampling probe as shown in Figure 21 The air sample is drawn through the PUF filter and then into the MicroDust Pro measuring chamber before being deposited onto the filter 25 mm or 37 mm The type of foam filter loaded into the adapter determines the size of particulate matter being monitored by the MicroDust Pro and being collected on the filter The PUF filter inserts have been designed as size selective filters to capture particles that are larger than a specified mean aerodynamic size However it is also possible to pre weigh and post weigh the PUF inserts to determine the total inhalable size dust fraction value and the desired size fraction PUF filters should be stored in a clean and preferably air conditioned environment If used without PUF filters the CIS adaptor will provide the total inhalable size dust fraction into the MicroDust for real time measurement 39 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Figure 21 PUF adapter installation 1 10 25 mm 10 37 mm 1 Pump connection 7 MicroDust sampling probe 2 Adapter block 8 Measuring chamber inlet 3 Locating spigots 9 PUF filter h
40. r keys used to move around the current menu and options gt lt q Navigator keys used to change the contents of the selected and field for example the indicated date time logging interval and so on Enter key that accepts the current menu option or the current highlighted option So Esc escape key that steps back to a previous menu item Press this key several times for a short cut back to the main menu D Power ON OFF key 2 2 Connections Power The power input port at the bottom of the instrument allows you to connect a Casella DC power supply part number PC18 to operate the instrument The port has a 2 1 mm centre pin for the positive supply d CAUTION You must make certain the DC power input ground is kept isolated from any signal ground Refer to Powering the instrument on page 13 for information about the instrument s power supply options 9 Casella CEL MicroDust Pro Aerosol Monitoring System Signals CASELLA CEL A 6 way port at the bottom of the MicroDust Pro instrument provides the following connections e RS232 serial digital communications for connecting the instrument to a PC e An analogue output signal for connecting the instrument to a chart recorder or to an external data logger Table 1 6 way port Pin Wire 9 way D type Function colour pin and function 1 Yellow N A Analogue ground 2 Red N A Analogue out White 3 TX out
41. ric adapter uses foam filter inserts to provide size selective sampling Filters are available for PM o Respirable 4 um and PM fractions These adapters allow you to use standard gravimetric methods to cross check readings from the MicroDust Pro instrument against a weighed sample All components of these adapters fit together using O ring seals You should check these regularly and you should fit new O rings if there are any signs of damage Damaged O rings can cause measurement errors due to air leakage If errors exist between the instrument s measurements and the true gravimetric value you can determine and apply a correction factor to the instrument s measurements Refer to Calibrating the instrument for a specific type of particulate on page 25 for instructions to do this Align and insert the sampling probe into the adapter block Insert the adapter s locating spigot into the probe s inlet so that the adapter cannot rotate or move on the probe 37 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL TSP and Respirable adapters Figure 20 Gravimetric and respirable adapter modules 13 G25 mm 1 d 12 37 mm 13 13 2 7 8 3 13 4 9 5 13 10 11 1 Pump connection 8 Measuring chamber inlet 2 Adapter block 9 Locating spigot 3 Locating spigot 10 Cyclone 4 Inlet tube 11 Coarse dust container 5 Thumb screw 12 Filter cassette 25 mm 37 mm 6 37mm to 25 mm reducer 1
42. ross check between readings of the MicroDust Pro and a weighed example This is achieved by collecting two average measurements over the exposure period one from the filter the gravimetric value and the other from the instrument s averaging function If there are differences between the gravimetric value and the instrument s reading a user defined correction factor can be entered for the relevant particulate type This correction factor can then be applied automatically to any measured values to provide optimal measurement accuracy Calibration procedure During the calibration you must use the MicroDust Pro instrument s logging feature to record the particulate concentration measured by the instrument 1 Adjust the instrument s zero and span settings as described in Adjusting the zero and span settings on page 23 This returns the instrument to the default calibration set by the factory so that all user defined calibrations are relative to this setting This is an absolute calibration that is not affected by changes to the correction factor 2 Fit the gravimetric or respirable adapter onto the instrument s probe and load a pre weighted filter into the cassette holder See section 6 1 Gravimetric adapters on page 37 for a description of the optional gravimetric or respirable adapters 3 Adjust the sampling pump to provide the appropriate flow rate e The respirable adapter requires a flow rate of 2 2 litre
43. rticulate concentration that has occurred in any 1 second period since the instrument was switched ON since the instrument was reset by pressing the 4 key or since logging started You cannot reset the maximum value while logging is active Average Ave The average value represents the average particulate concentration since the instrument was switched ON since the instrument was reset by pressing the 4 key or since logging started 29 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL You cannot reset the Average while logging is active 3 5 Data logging Configuring the data logging function You should configure the instrument for the measurement application before you begin making measurements Figure 16 Configuring the data logging function MAINMENU av ViewGraph Pal View Measurement MicroDust Status Logger Calibration LOGGER av Start Logger View Runs ConfigLogger CONFIG LOGGER X 001 600 sec Interval Sec gt Stop when full SESCH lt Over write RUN Stop when full Clear Memory NO X YES NO Interval The logging interval is the time between each recorded data point Mode The logging mode determines what happens when all empty memory locations have been filled with data e When set to Over write RUN logging continues and over writes the oldest record with the newest record e When set to Stop when full logging stops automatically when the mem
44. s minute e For isokinetic sampling the flow rate is calculated from the sample velocity and cross sectional area of the gravimetric inlet tube 200 mm2 e For general Total Suspended Particulate TSP measurements the actual flow rate is not critical but will affect the mass of the 26 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL collected sample 4 Start gravimetric sampling and start the instrument s internal data logger refer to section 3 5 Data logging on page 30 for instructions to use the instrument s data logging feature This resets the Time Weighted Average TWA value 5 Continue sampling for a period that is long enough to collect a sufficient sample mass 6 At the end of the sampling period stop the data logger and stop the sampling pump The average real time measurement is available on the display and is stored in an internal data file 7 Write down the TWA value 8 Condition and weight the filter to measure the collected mass 9 Calculate the gravimetric concentration during the sampling period as follows f Mass increase Gravimetric concentration Total sampled volume 10 Calculate the calibration correction factor as follows i Gravimetric concentration Correction factor Instrument s TWA reading Example Filter mass increase 3 21 Mg Volume sampled 0 75 m3 calculated from the flow rate and sample time e 3 21 Gravimetric concentration
45. ter or from a battery supply You should clean the aspirator regularly to make sure there is no accumulation of dust which can cause measurements errors or mechanical seizure of the fan 7 Specifications 7 1 Instrument specification Measurement Sensing technique Forward light scattering 12 to 20 using infrared source wavelength 880 nm Measuring range 0 001 to 2500 mg m3 over four ranges e oto 2 5 mg m3 e oto25 mg m3 e oto 250 mg m3 e Oto 2500 mg m3 The active range can be fixed or auto ranging Resolution 0 001 mg m3 Zero stability Typically lt 2 ug m3 C Span stability 0 7 of reading C Temperature Operating o C to 55 C non condensing Storage 20 C to 55 C non condensing Power supply Power consumption Approximately 100 mA at 6 V Battery Four AA MN1500 cells Alkaline or rechargeable NiMH Operating run time on batteries Alkaline 2700 mAh Typically gt 20 hours NiMH 950 mAh Typically gt 9 hours 42 Casella CEL MicroDust Pro Aerosol Monitoring System Battery charging Important Charge rate Fast charge Standby charge Power adapter PC18 Type Input voltage range Output Connectors Supply capacity Physical Display Keypad Weights Instrument with probe Complete kit in case Dimensions Instrument Probe Carry case CASELLA CEL Internal NiMH fast charging circuitry Charge termination based on Negative Delta V detection with additional time o
46. terrogate target cccssssssscccccessessssnsnseceeeceesesseaesaesecesecsesesnausececeess 34 5 4 Command T Download records stored ue 35 5 5 Command R Set instrument ID time and date 35 5 6 Commnd B Upload a bitmap to the instrument EE 36 5 7 Command C Clear bitmap REENEN EEN issis aa 36 Se ulu Eier fe Tune reedi e eii ieii 36 6 Sampling TE 37 6 1 Gravimetric ACAD CONS iss0is sesssscecanssevanecsevs cdenvsstensdecescusvsveunvderedcouedvos vnswerdaccaasssveveneerseeases 37 6 2 ASpirator dt EE 41 7 SPOCIFI CATIONS sivescs vecvesscecvessonsccecedvevsseeschestesovceeveedsuntecansveces evessesenewecesvevsssoeteueses Ed 42 7 1 Instrument SPECICATION i sevseceecs covseeenadeedsiecstesusea cove cviueev ened evel Gages EEEE EE EREET EES 42 72 MAINteTANCO sa vais ccs cccsccesdcageves cxcsuek faeasecdecunessunaucesdasccevcevandocdeieanaseversoceteeuestasned evel secant 45 73 Optional AGCESSOMIES serris iieii einen an E AEAEE codes cauavadaccceevesoveeaeaacececssoeyns 45 2 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL z Standards compliant s siessen n e eee s e Ere Eaa EEE a 45 8 Maintenance and Servicing sscccesssscccesssssccessssececssssseseceesseeeccessseeceecessaceecessaneecess 46 8 1 Lens ul EE 46 K General MaiNteN ane iis sccedsiscsssaaeeeeceevedeayevenderdeedccceaven vba AAA EAR 47 GE Out e El 48 9 Servicing and Warranty arrangeMents cccsscccssscecessccsssccecsscs
47. ument Follow the advice on page 46 to clean the instrument CAUTION The MicroDust Pro instrument contains no user serviceable parts Do NOT try to open it If you suspect the instrument has developed a fault condition contact Casella CEL for advice and be ready to return the instrument to Casella CEL for repair Refer to section 9 Servicing and Warranty arrangements beginning on page 49 for advice on servicing the instrument 7 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 2 Features Figure 2 shows the main features of the MicroDust Pro instrument Refer to Figure 2 when you perform the tasks and instructions in this User Manual Figure 2 Main features of the MicroDust Pro q lt gt gt gt erosol MoyZoring System EE A MICHT pro III Pull the knurled sleeve outwards to release the connector Red dot Display screen Escape key ON OFF key Navigation keys Battery charging indicator Enter key Probe purge inlet 10 Clip for probe Ccayanawnre 8 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL 11 Slide the probe collar up or down to expose the measurement chamber 12 Sampling probe 2 1 Control functions You operate the instrument through the menu structure by using a combination of function keys and navigator keys on the instrument s front panel The key functions are listed below a vi Navigato
48. ut protection The charger MUST be disabled when operating from non rechargeable batteries See Setting the DIP switches on page 12 450 mA Approximately 55 mA Universal power supply 100 V to 240 V AC 47 Hz to 63 Hz 12 V DCato 8A Supplied with connectors suitable for USA UK European and Australian mains outlet sockets The instrument can be operated continuously from the PC18 power adapter 128 x 64 pixel LCD graphics panel with backlight Seven key tactile membrane 0 97 kg 4 5 kg Height 245 mm Width 95 mm Depth 50 mm Diameter 35 mm Total length 290 mm Height 135 mm Width 490 mm Depth 370 mm 43 Casella CEL CASELLA MicroDust Pro Aerosol Monitoring System CEL Displayed values Current concentration Average Max value Scrolling graph Factory calibration Routine calibration Data logging Internal memory Example capacities Logging every 5 s Logging every minute Logger interval Represents the rolling average of instantaneous particulate concentration over a user selectable time period from 1 second to 60 seconds Represents the average value since the instrument was switched ON or since the instrument was reset Represents the maximum instantaneous value since the instrument was switched on or since the instrument was reset Instantaneous values are updated at intervals of 1 second The graph mode proves an indication of variations in particulate concentrat

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