LPA²/User Guide
Contents
1. 4 6 14 21 25 38 50 T0 39 CALIBRATION Normal I i NAS CODE SAMPLE VOLUME 15ml 100ml XXXXXXXXX XXXXXXXXX XXXXXXXXX XXXXXXXXX XXXXXXXXX XXXXXXXXX XXXXXXXXX XXXXXXXXX 3 5 Further Tests 3 5 1 Same Sampling Point The Analyser upper operating limit is set at 24 22 20 Tests that result in particle counts exceeding any scale number in the three part ISO code upper limit has the scale number re placed by an asterisk Also the associated particle counts on the printout are replaced by X s Refer to the example on the left To repeat a test on the same sample point press START button 1 18 Online Operation 3 5 2 3 5 3 3 6 Note that the test number will automatically increment Different Sampling Point Same System To carry out this new test repeat steps 8 to 13 on page 15 To change test reference test mode data repeat steps 1 to 13 on page 11 New System To carry out this test repeat steps 1 to 13 on page 11 Shutting Down Switch off the Analyser by Pressing the Red Button Operate the Flush Valve to release the pressure Disconnect the Fluid Sampling Hose from the system by means of the Minimess connector This isolates the fluid supply Remove the Fluid Sampling Hose from the Analyser Remove the Waste Fluid Hose from the Analyser Replace the Hose End Caps on sampling hose wipe clean and store Connect the Waste Fluid Hose quick coupling end fittings together2. O oo o uv 3 we Introduction 3 Online Operation 1 Insert WASTE FLUID HOSE in to the waste disposal bottle pro vided Important Do not connect Waste Fluid Hose to a pressurised system as this will cause the Analyser to malfunction and could cause internal leakage The Waste Fluid Hose must be discharged into the waste disposal bottle provided or into a tank vessel vented to atmosphere M E 2 Connect WASTE FLUID HOSE to Analyser waste connector Push back quick coupling outer ring before connecting disconnecting hose end 3 Connect FLUID SAMPLING HOSE to Analyser HP connector 4 Connect FLUID SAMPLING HOSE to the system by means of the minimess connector The system to be monitored must not exceed 400 bar or be less than 2 bar 5 Press GREEN BUTTON to switch on Analyser the Main test progress screen will be displayed 8 Online Operation To prolong battery life it is advisable to switch off the Analyser when not in use 3 1 Main Test Progress Screen f Next Test Reference Next Test Number Normal Test Ex ISO Code is Start Stop Print Paper Set Log Contrast LE Figure 3 1 Main Test Screen 1 START Starts sampling and emptying cycle 2 STOP Stops test at any point in the sampling emptying cycle Next test will start with an emptying cycle before the test commences 3 PRINT Prints test results If AUTO PRINT mode has
3. Launch LPA View software From File select Upload Data Transfer Screen will be displayed Select appropriate COM Port Select Transfer Data The Analyser will download all stored results from memory into the software package Upon completion of download the Analyser memory can be automatically deleted if this option has been se lected from the PC menu When the transfer is complete switch OFF the Analyser See Appendix on page LXV for more information on the RS232 connection op tions 40 Computer Analysis 13 13 1 Warranty The LPA is guaranteed for 12 months upon receipt of the Analyser subject to it being used for the purpose intended and operated in accordance with this User Guide Recalibration MP Filtri UK will only verify the accuracy of the LPA if the unit is recalibrated every 12 months Please ensure that the test results in the Log are downloaded to LPA View before the LPA is despatched in case action taken by MP Filtri UK during the service recalibration causes the Log to be cleared KL d It is requested that only the LPA not the support case or any other ancilliaries be returned for recalibration MP Filtri UK will not be held responsible for any items returned as such Ensure that the LPA is packed appropriately for transportation Warranty 41 42 Warranty APPENDIX A Measuring Water in Hydraulic and Lubricating Fluids From North Notts Fluid Power Centr
4. value The effect of this is a don t care value when used as the cleanliness target For example 6B 6C 7D is translated as A 6B 6C 7D E F In this case testing will continue until the B C and D Classes are less than or equal to 6 6 7 respectively The A E and F Classes are effectively ignored since they cannot ever be worse than a Class Note AS4059E 2 denotes Table 2 of the AS4059E standard Continuous Sampling 25 11 12 13 14 15 16 17 Press FLUSH valve push button to open flush valve push button il luminates to indicate valve is open Leave valve open for at least one minute or 200ml of fluid to remove any entrapped air and fluid from the previous test ensuring no cross contamination between samples Press FLUSH valve push button to close flush valve push button illumination is cancelled Alternatively proceed to step 13 the action of pressing Start button automatically closes the Flush valve before sampling commences Press START button The Analyser will now commence the sampling cycles The completion progress bar indicates the status of the test Results will be automatically displayed on the screen after each test Results will be automatically printed at the end of the emptying cy cle if the Auto Print mode has been turned ON The status is shown as Waiting between the ending of one test and the stating of the next test Press Stop button key 2 at any time in the
5. LPA User Guide Meer el O www mpfiltri co uk Covers Model Numbers LPA SAFETY WARNING Hydraulic systems contain dangerous fluids at high pressures and temperatures Installation servicing and adjustment is only to be performed by qualified personnel Do not tamper with this device DocuMENT REVISION 14 Contents 1 9 Precautions Battery Internal Cleaning LCD Visibility Introduction Online Operation Main Test Progress Screen Analyser Settings For Test Interpreting Results Further Tests Continuous Sampling Continuous Sampling Basic Operation Moisture Sensor Alarms Wiring Bottle Sampling Data Logging 10 Battery Charging 11 Printer Paper 12 Computer Analysis Software Installation Results Download 6 8 Preparing Analyser eShutting Down 20 27 29 32 34 35 36 38 40 13 Warranty Recalibration Measuring Water in Hydraulic and Lubricating Fluids ISO 4406 1999 Cleanliness Code System NAS 1638 Cleanliness Code System SAE AS 4059 REV E Cleanliness Classification For Hydraulic Fluids Recommendations Hydraulic System Target Cleanliness Levels New ISO Standard Test Dust and its effect on ISO Contamination Control Standards Calibration New Test Dust Benefits Effect on Industry lation Other Standards Specification Spare Product Part Numbers COM Ports Connection Using a USB Port Determining th
6. wipe clean and store Online Operation 19 4 Continuous Sampling The Analyser can be selected for continuous testing at set time in tervals Once continuous sampling has started the Analyser s Flush valve automatically opens and closes before each test This allows rep resentative fluid to reach the sensing arrangement before the 15ml sampling test commences The Flush valve automatically opens at the end of the sampling cycle and remains open whilst the Analyser is emptying to waste the sam ple fluid from the previous test Additionally depending on the time set for Minutes Between Tests the Flush valve operates as follows e Time set to 0 At the end of the Analyser s emptying cycle the Flush valve au tomatically closes and the next sampling test immediately starts e Time set to between 1 and 5 After the Analyser s emptying cycle has finished the Flush valve remains open for the time set then automatically closes before the next sampling test e Time set to between 6 and 30000 Flush valve automatically closes after the emptying cycle has finished and remains closed until 5 minutes before the next sam ple test is programmed to start The Flush valve status is indicated by the push button illumination Not illuminated means valve closed Illuminated means valve open The servo motor operating the Flush valve exhibits a slight ticking noise both when it is open and close This is normal 20 Continuo
7. 19 2 5 18 513 10 17 6 4 16 3 2 15 1 6 104 14 8 13 4 12 2 11 102 10 g 5 g 5 O b 2 5 E 8 E 213 5 10 7 s 6 4 B 6 3 2 E 5 1 6 2 10 MI 7 3t 5 4 c 2d 3 2 lt E 119 21 4 6 14 New ISO 4406 standard um c 5 15 Old standard 46 ISO 4406 1999 CLEANLINESS CODE SYSTEM APPENDIX C NAS 1638 Cleanliness Code System The NAS system was originally developed in 1964 to define contamination classes for the contamination contained within aircraft components The ap plication of this standard was extended to industrial hydraulic systems simply because nothing else existed at the time The coding system defines the max imum numbers permitted of 100ml volume at various size intervals differ ential counts rather than using cumulative counts as in ISO 4406 1999 Al though there is no guidance given in the standard on how to quote the levels most industrial users quote a single code which is the highest recorded in all sizes and this convention is used on the LPA software 00 0 1 2 3 4 5 6 7 8 9 10 11 12 5 15 125 250 500 1000 2000 4000 8000 16000 32000 64000 128000 256000 512000 1024000 15 25 22 4 89 178 356 712 1425 2850 5700 11400 22800 45600 91200 182400 25 50 4 8 16 32 63 126 253 506 1012 2025 4050 8100 16200 32400 50 100 1 2 3 6 11 22 45 90 180 360 720 1440 2880 5760 Over 100 0 0 1 1 2 4 8 16 32 64 128 256 512 1024 Figure C l CONTAMINATION LEVEL CLASSES according to NAS 1638 January 1
8. 3 only ap plies to the Continuous Test alarm mode 1 For detailed instructions refer to Continuously Sampling page 20 Alarm Options refer to page 29 Results will be displayed upon completion of three tests including emptying cycle 14 Online Operation 3 3 10 11 12 13 Preparing Analyser For Test Taking sample Normal Dynamic Triple Bottle Short Press FLUSH valve push button to open flush valve push button il luminates to indicate valve is open Leave valve open for at least one minute or 200ml of fluid to remove any entrapped air and fluid from the previous test ensuring no cross contamination between samples Press FLUSH valve push button to close flush valve push button illumination is cancelled Alternatively proceed to step 10 the action of pressing Start button automatically closes the Flush valve before sampling commences Press START button The analyser will now commence the sampling cycle The completion progress bar indicated the status of the sample e The completion progress bar indicates the status of the sample e Results will be automatically displayed on the screen e Results will be automatically printed at the end of the sampling cycle if the Auto Print mode has been turned ON e If the Auto Print mode has been turned OFF then press Print key to obtain printed results Following the sampling results the Analyser automatically discharges the sample fluid to waste
9. Button 5 is used from the Settings Screen to cycle between the available test types These are Normal Dynamic Triple Bottle Continuous and Short Sample The selection will be displayed on the Main test progression screen Normal Single Test 15ml sample volume Online Operation 13 3 2 6 Dynamic A comprehensive triple test with results average 30 ml sample volume comprised of three 10ml sampling and emptying cycles Allows the effect of system fluctuations to be measured over a longer period of time Unit is flushed in between tests to ensure each sample is representative of its point in time Triple Bottle Sampling A triple test with results average and quicker than the Dynamic Test 24ml sample volume comprised of three individual 8 ml samples tested consecutively For Bottle Sam pling refer to separate User Guide Continuous for detailed instructions refer to Continuous Sampling page 20 Short Single Test 8 ml sample volume This provides results in less time than the Normal Test It is not recommended for oil samples cleaner than ISO 17 15 12 NAS 6 as the accuracy of the result might be compromised by the small sample volume Press 5 repeatedly to select desired test type Test Options Press 6 The Test Options Screen will be displayed The RH Test setting is not displayed if the option is not fitted This mainly applies to the continuous test mode Option
10. Test status is shown as Emptying When the Sampling and Emptying cycle has been completed the test status is shown as Idle Online Operation 15 3 4 Results are automatically stored to memory To download results follow instructions on page 35 Interpreting Results Refer to page LI for hydraulic component manufacturers recommen dations on standard cleanliness requirements for various applica tions ISO 4406 1999 and NAS 1638 cannot be directly compared 16 Online Operation TEST NUMBER 39 TEST NUMBER 39 TEST REF CALIBRATION TEST REF CALIBRATION TEST TYPE Normal TEST TYPE Dynamic ISO CODE ISO CODE NAS CODE 10 NAS CODE 6 SAMPLE VOLUME 15ml SAMPLE VOLUME 24ml um c 100m 100ml 100ml Average um c 100ml 4 29092 27370 34069 30177 i xs 6 11675 12058 17417 13716 P Bu 14 1132 1274 1062 1156 2064 21 283 389 424 365 JE adi 25 177 318 212 235 38 35 35 70 46 38 240 A 50 0 0 0 0 70 5 70 0 0 0 0 ONLINE Normal ONLINE Dynamic Particle count ISO and NAS Code complete and ISO code to with average analysis 1504406 1999 standard TESTNUMBER 39 TEST REF CALIBRATION TEST TYPE Normal NAS CODE 7 um 5 15 15 25 25 50 50 100 100 NAS 6 5 T T 00 ISO CODE 16 15 12 SAMPLE VOLUME 15ml ym 100ml 5 15 15860 15 25 1239 25 50 952 50 100 132 100 0 ONLINE Normal Particle counts displayed NAS code 1638 standard Online Operation 17 TEST NUMBER TEST REF TEST TYPE ISO CODE um c
11. VALVE push button to open the Flush valve The push button illuminates to indicate that the valve is open Leave valve open for at least 1 minute or 200ml of fluid or more ifthe HP sampling hose is greater than 1 5m long Press FLUSH VALVE push button to close Flush valve push button illuminates is cancelled Alternatively proceed to Step 5 below the action of pressing Start button automatically closes the Flush valve before sampling commenced Press the START button The Analyser will now commence the sampling procedure The completion progress bar indicates the status of the test e Results will be automatically displayed on the screen after each test e Results will be automatically printed at the end of the emptying cycle if the Auto Print mode has been turned ON The status is shown as Waiting between the ending of one test and the starting of the next 22 Continuous Sampling 8 4 1 1 10 Press Stop button 2 at any point in the cycle to end continuous sampling The test status will show Idle Continuous Sampling with Clean Alarm Levels Alarm Mode 1 This operating mode is similar to the Basic Operation but in this mode the Analyser will stop testing when the specified clean alarm level is achieved A status of COMPLETED is shown on the LCD when the specified clean alarm level is achieved For other Alarm Modes refer to page 31 Follow the section Analyser Settings page 11 instructions 1 t
12. been turned off a copy of the results is obtained by pressing PRINT button 4 PAPER Ejects printer paper by three blank lines 5 SET Selects settings screen see page 11 6 LOG Selects Data Logging screen see page 35 Online Operation 9 Transfer log downloads memory to software package Clear log Clears memory Clear last Clears last result Recall Recalls results from memory Print Prints recalled results CONTRAST Adjusts the screen contrast 7 Darker 8 Lighter m OW BATTERY INDICATOR see page 36 2 This is not needed on new units Provided unit has not been switched off 10 Online Operation 3 2 Analyser Settings Press the SET button 5 to program the Analyser to your require ments The main Settings Screen will be displayed To alter the Analyser settings progress through the following routine from this screen 1 Test Ref machine one 2 Test Number 123 3 Time and Date 4 Result Presentation Options 5 Test Type Normal 6 Test Options 7 Alarm Options Press a Key to Choose or 0 to Exit Figure 3 2 Main Settings Screen 3 2 1 Test Ref 1 Press 1 then input your reference details e g MACHINE 1 RETURN 15 characters maximum 3 2 2 Test Number 2 Press 2 then input the required test number e g 123 The Test Online Operation 11 3 2 3 3 2 4 gt Number will automatically increment for each su
13. for Differential Particle Counts SAE AS 4059 REV E CLEANLINESS CLASSIFICATION 49 APPENDIX D Size LM C gt 4 gt 6 gt 14 gt 21 gt 38 gt 70 Size Code A B C D E F Classes 000 195 76 14 3 1 0 00 390 152 27 5 1 0 0 780 304 54 10 2 0 1 1 560 609 109 20 4 1 2 3 120 1 217 217 39 7 1 3 6 250 2 432 432 76 13 2 4 12 500 4 864 864 152 26 4 5 25 000 9 731 1 731 306 53 8 6 50 000 19 462 3 462 612 106 16 7 100 000 38 924 6 924 1 224 212 32 8 200 000 77 849 13 849 2 449 424 64 Ke 400 000 155 698 27 698 4 898 848 128 10 800 000 311 396 55 396 9 796 1 696 256 11 1 600 000 622 792 110 792 19 592 3 392 512 12 3 200 000 1 245 584 221 584 39 184 6 784 1 024 Table D II AS4059E Table 2 Cleanliness Classes for Cumulative Particle Counts 50 SAE AS 4059 REV E CLEANLINESS CLASSIFICATION APPENDIX E Recommendations Unit Type ISO 4406 1999 Code PUMP Piston slow speed in line 22 20 16 Piston high speed variable 17 15 13 Gear 19 17 15 Vane 18 16 14 MOTOR Axial piston 18 16 13 Radial piston 19 17 13 Gear 20 18 15 Vane 19 17 14 VALVE Directional solenoid 20 18 15 Pressure control modulating 19 17 14 Flow control 19 17 14 Check valve 20 18 15 Cartridge valve 20 18 15 Proportional 18 16 13 Servo valve 16 14 11 ACTUATOR 20 18 15 Table E I Typical Manufacturers Recommendations for Component Cleanliness ISO 4406 1999 X Most component manufacturers know the proportionate eff
14. 00F 16 14 11 5 2 17 15 09 400 17 15 10 800F 17 15 12 6 3 18 16 10 800 18 16 11 1 300F 18 16 13 7 4 19 17 11 1 300 2000F 19 17 14 8 5 20 18 12 2 000 20 18 13 4 400F 20 18 15 9 6 21 19 13 4 400 6 300F 21 19 16 10 22 20 13 6 300 22 20 17 11 23 12 14 15 000 23 21 18 12 24 22 15 21 000 25 23 17 100 000 Table New ISO STANDARD TEST DUST AND ITS EFFECT ON ISO 61 APPENDIX H Specification As a policy of continual improvement MP Filtri UK reserve the right to alter the specification without prior notice Technology Laser Package Display Sensitivity Accuracy repeatability Calibration Analysis Range Report Print Format Printer 62 Automatic Optical Particle Analyser Twin Laser and Twin Optical Diode Detectors Backlight graphical LCD gt 4 6 14 21 25 38 50 70 uum c sizes to revised ISO 4406 1999 Standard Better than 3 typical Each unit is individually calibrated with ISO Medium Test Dust MTD based on ISO 11171 1999 on equipment certified by L E T S ISO 8 to ISO 24 to ISO 4406 1999 NAS 1638 2 to 12 AS4059E Table 1 2 to 12 AS4059E Table 2 Size Codes A 000 to 12 B 00 to 12 C 00 to 12 D 2 to 12 E 4 to 12 F 7 to 12 ISO4406 1999 NAS1638 and AS4059E codes classes with Individual particle counts as a built in option Fixed head thermal printer 384 dots per line SPECIFICATION LPA2 Sample volume Operation Viscosity range Operating temperature Flui
15. 1 25 38 50 70 Xl To be confirmed by NIST 58 New ISO STANDARD TEST DUST AND ITS EFFECT ON ISO APPENDIX G Correlation Particle Size Obtained Using I UN Li The table shows the correlation be A I a tween Particle Sizes Obtained using ACFTD ISO 4402 1991 and NIST 3 5 ISO 11171 Calibration Methods 6 8 9 This table is only a guideline The 10 exact relationship between ACFTD 1 sizes and the NIST sizes may vary 13 from instrument to instrument de 15 pending on the characteristics of 17 the particle counter and original 15 ACFTD calibration 20 FASOSOANNARRODDASOCCRNANNUBUNDDHOSL RN Rom N EN RPWWRNNNNNNNNWNNNNNEEE EE HRS I tb O00 1 10 CA UN SN UODULODL RNODUNODUNDODUNDDRAD WA New ISO STANDARD 59 APPENDIX G Other Standards Although the ISO 4406 1999 standard is being used extensively within the hydraulics industry other standards are occasionally required and a compar ison may be requested The following table gives a very general comparison but often no direct comparison is possible due to the different classes and sizes involved All section headings indicated with are reproduced by kind permission of British Fluid Power Association from BFPA P5 1999 issue 3 Appendix 44 60 New ISO STANDARD TEST DUST AND ITS EFFECT ON ISO APPENDIX G ISO 4406 1999 DERSTD 05 42 7 NAS 1638 5 SAE 749 8 Table A Table B ISO 11218 6 13 11 08 2 14 12 09 3 0 15 13 10 4 16 14 09 4
16. 964 The contamination classes are defined by a number from 00 to 12 which indicates the maximum number of particles per 100 ml counted on a differ ential basis in a given size bracket NAS 1638 CLEANLINESS CODE SYSTEM 47 APPENDIX D SAE AS 4059 REV E Cleanliness Classification For Hydraulic Fluids VI This SAE Aerospace Standard AS defines cleanliness levels for particulate contamination of hydraulic fluids and includes methods of reporting data re lating to the contamination levels Tables 1 and 2 below provide the Max imum Contamination Limits Particles 100ml of differential and cumula tive particle counts respectively for counts obtained by an automatic particle counter e g LPA VIII The information reproduced on this and the previous page is a brief extract from SAE AS4059 Rev E revised in May 2005 For further details and explanations refer to the full Standard 48 SAE AS 4059 REV E CLEANLINESS CLASSIFICATION APPENDIX D Size range um e 6 14 14 21 21 38 38 70 gt 70 Class 00 125 22 4 1 0 0 250 44 8 2 0 1 500 89 16 3 1 2 1 000 178 32 6 1 3 2 000 356 63 11 2 4 4 000 712 126 22 4 5 8 000 1 425 253 45 8 6 16 000 2 850 506 90 16 7 32 000 5 700 1 012 180 32 8 64 000 11 400 2 025 360 64 9 128 000 22 800 4 050 720 128 10 256 000 45 600 8 100 1 440 256 11 512 000 91 200 16 200 2 880 512 12 1 024 000 182 400 32 400 5 760 1 024 Table D I AS4059E Table 1 Cleanliness Classes
17. International Standards Orga Number of Particles per mL Scale No nization standard ISO 4406 1999 is the preferred method of quoting je vds ba the number of solid contaminant particles in a sample AN i vile The code is constructed from the ESM Mm zs Ka 640k 1 3M 27 combination of three scale num TET BAK 26 bers selected from the following 160k 320k 25 table 80k 160k 24 The first scale number represents 20k BK 23 the number of particles in a mil SR e i 10k 20k 21 lilitre sample of the fluid that are 5000 10k 20 larger than 4 um c 2500 5000 19 The second number represents the 1300 2500 18 number of particles larger than 6 640 1300 17 320 640 16 um c 160 320 15 The third represents the number 80 160 14 of particles that are larger than 14 40 80 13 um c 20 40 12 10 20 11 5 10 10 2 5 5 0 9 1 3 2 5 8 0 64 1 3 7 0 32 0 64 6 0 16 0 32 5 0 08 0 16 4 0 04 0 08 3 0 02 0 04 2 0 01 0 02 1 0 0 0 01 o ISO 4406 1999 CLEANLINESS CODE SYSTEM 45 APPENDIX B Microscope counting examines the 10 24 particles differently to APCs and 8 SO 23 the code is given with two scale 4 22 numbers only These are at 5 um 2 Example and 15 um equivalent to the 6 6 code 21 10 22 19 14 um c and 14 um c of the APCs 20
18. NDIX F Hydraulic System Target Cleanliness Levels Where a hydraulic system user has been able to check cleanliness levels over a considerable period the acceptability or otherwise of those levels can be verified Thus if no failures have occurred the average level measured may well be one which could be made a bench mark However such a level may have to be modified if the conditions change or if specific contaminant sen sitive components are added to the system The demand for greater reliability may also necessitate an improved cleanliness level The level of acceptability depends on three features e the contamination sensitivity of the components e the operational conditions of the system e the required reliability and life expectancy HYDRAULIC SYSTEM TARGET CLEANLINESS LEVELS 53 APPENDIX F Contamination Corresponding Recommended Typical Codes Codes Filtration Applications ISO 4406 1999 NAS 1638 Degree 4 6 14 Bx200 pm c gum c pm c 14 12 9 3 3 High precision and laboratory servo sys tems 17 15 11 6 3 6 Robotic and servo systems 18 16 13 7 10 12 Very sensitive high reliability systems 20 18 14 9 12 15 Sensitive reliable systems 21 19 16 10 15 25 General equipment of limited reliability 23 21 18 12 25 40 Low pressure equip ment not in continu ous service The table shows the recommended filtration level for various hydraulic com ponents together with typical target system cleanlines
19. Press 7 to change RH Test status to ON or OFF 28 Moisture Sensor 6 Alarms Access the Operations screen as described on page 11 and press ALARM OPTIONS The Alarm Options screen will be displayed 1 Alarm Mode 1 2 Dirty Alarm Level ISO 0 3 Dirty Alarm Level NAS1638 AS4059E 1 0 4 Dirty Alarm Level AS4059E 2 1A 2B 3C 4D 5E 6F Press a Key to Choose or 0 to Exit M E The LPA includes two solid state relays for connections to an ex ternal circuit These can be arranged to function as follows 1 Alarm Mode O Selecting option 0 switches relays 1 and 2 always off 2 Alarm Mode 1 Selecting option 1 will configure relays 1 and 2 as described on page 32 refer to the examples given on the simple wiring diagrams Alarms 29 Clean alarm levels are set in accordance with the instructions start ing on page 23 Alarm mode 1 is used in conjunction with the Con tinuous Sampling test type enabling the Analyser to operate contin uously until the specified clean alarm level is achieved Alarm Mode 2 Selecting option 2 arranges the relays to operate when the Clean and Dirty alarm levels are reached exceeded Alarm mode 2 will normally be used in conjunction with the Continuous test type refer to page 21 but can be used with all other test types as well Set the Clean and Dirty alarm levels by inputting the desired levels in to both the Test options screen page 14 and the Alarm options
20. ccessive test Time and Date Press 3 then use the keypad to set the time and date Cycle Count A cumulative cycle count is also displayed on the Time amp Date screen This count automatically increases by 1 each time a test is taken It is not possible to adjust reset this value Result Presentation Options Press 4 to bring up the Presentation Options screen Then press the relevant key to switch between the option selections 1 cycles between the various available formats for the test result These are ISO NAS AS4059E 2 and AS4059E 1 turns on and off the printing of detailed counts with the test re sult 3 turns on and off the printing of the user Test Reference E turns on and off automatic result printing turns on and off the printing of an additional space for hand writ ten notes on the printout AS4059E 1 and AS4059E 2 denotes Table 1 and Table 2 of the ASA059E standard respectively 12 Online Operation 6 selects the display language Note the Analyser has 5 language options 0 English Default 1 Italian 2 French 3 German 4 Chinese For selection of language proceed as follows Press 6 Enter chosen value e g 1 for Italian Press key 0 zero Press key 0 zero Wait 5 seconds Switch OFF the unit RESTART the unit The main screen will then be displayed in the language se lected 3 2 5 Test Type 5
21. cycle to end continuous sampling The test status will show Idle 26 Continuous Sampling 5 Moisture Sensor The LPA version fitted with the optional moisture sensor module allows both measurement of saturation of water in oil Relative Humidity and temperature These are displayed as RH and C on the main test progress screen and on the printed results Temperature measurement provides a reference temperature for the RH reading Due to the temperature gradient existing between the system tapping point and the RH temperature module the tempera ture reading can be 5 C to 10 C less than the actual system temperature depending on operating conditions M gt The LPA can be configured to do a test with or without the moisture sensor selected If the moisture sensor has been selected the flush valve will open automatically for a period of 3 minutes before the particle count test commences This is to allow the moisture sensor to stabilise and give an accurate reading To switch the moisture sensor ON or OFF select the Test Option Screen as described on page 14 The Test Options Screen will be displayed Moisture Sensor 27 Minutes Between Tests 0 Log Every Test On 3 Confirm Cleanliness Level Off Clean Alarm Level ISO 0 Clean Alarm Level NAS1638 AS4059E 1 0 Clean Alarm Level AS4059E 2 1A 2B 3C 4D 5E 6F 7 RH Test On Press a Key to Choose or 0 to Exit SS 4
22. d compatibility Typical test time Power Data storage Computer interface Hose connections Dimensions SPECIFICATION APPENDIX H 15 ml normal 30 ml dynamic 24 ml bottle sampler 15 ml continuous 8ml short Max system working pressure 400 bar Min working pressure 2 bar to 400 centistokes 5 to 80 C Mineral oil amp petroleum based fluids consult MP Filtri for other fluids Result in lt 2 5 mins normal test Internal rechargeable battery mains charger or External 12 24 volt DC power supply 600 tests RS 232 communication port minimess fittings microbore hose 1 5 metres long waste fluid hose Height 210mm Depth 260mm Width 430mm Weight 7 6kg 63 APPENDIX Spare Product Part Numbers For spares and part numbers please see the website www mpfiltri co uk 64 SPARE PRODUCT PART NUMBERS APPENDIX J COM Ports The LPA uses the RS232 connection standard to interface with a computer If the computer does not have a built in RS232 7 COM port a USB RS232 adaptor can be used Connection Using a USB Port This is used when a built in RS232 port is not available When using a USB Adaptor provided with the analyzer Install the Prolific driver from the file PL2303 Prolific DriverInstaller v110 exe on the provided CD You will need to accept any warnings about making changes to your com puter Follow the installer Wizard accepting the defaults When the in
23. e In mineral oils and non aqueous fire resistant fluids water is undesirable Min eral oil usually has a water content of 50 300 ppm which it can support with out adverse consequences Once the water content exceeds about 500ppm the oil starts to appear hazy Above this level there is a danger of free water accumulating in the system in areas of low flow This can lead to corrosion and accelerated wear Similarly fire resistant fluids have a natural water content which may be different to mineral oils Saturation Levels 9 Since the effects of free also emul Saturation point Els sified water is more harmful than Emulsified 100 those of dissolved water water lev els should remain well below the BEEN 75 saturation point However even water in solution can cause dam 50 age and therefore every reasonable effort should be made to keep sat 9 uration levels as low as possible eee 3 There is no such thing as too little b E water As a guideline we recom 0 Ay mend maintaining saturation levels below 50 in all equipment MEASURING WATER CONTENT 43 APPENDIX A Typical Water Saturation Levels For New Oils 600 S E 400 E X o Q o t 200 G a 0 20 30 40 50 60 70 Temperature C Figure I Examples Hydraulic oil 30 C 200ppm 100 saturation Hydraulic oil 65 C 500ppm 100 saturation 44 MEASURING WATER CONTENT APPENDIX B ISO 4406 1999 Cleanliness Code System The
24. e COM Port Fault Finding 41 XLIII XLV XLVII XLVIII LI LIII LV Corre LXII LXIV LXV LXVII 1 1 1 1 2 1 3 Precautions The default language setting for the LPA Laser Particle Analyser is English To change the language setting refer to page 12 Battery It is recommended that the LPA be charged for a minimum of 24 hours prior to first use to fully charge the internal battery Internal Cleaning DO NOT clean the LPA or Bottle Sampler with Acetone or simi lar solvents that are not compatible with nitrile seals The recom mended cleaning fluid for internal flushing is Petroleum Ether see also Fault Finding page LX VII The use of a 500m coarse screen filter screwed onto the HP con nector is recommended for heavily contaminated systems Refer to page LXIV for the part number LCD Visibility If the LCD screen remains blank then refer to page 36 for recharging instruction To improve the LCD screen visibility the Analyser can be inclined by unlatching the two extension feet fitted to the bottom of the case Precautions 5 2 Introduction The LPA Contamination Analyser is designed to measure and quan tify the numbers of solid contaminants in Hydraulic Lubrication and Transmission applications The LPA is designed to be a labo ratory accurate instrument suitable for on site applications util ising mineral oil as the operating fluid The instrument uses the light ext
25. ect that increased dirt level has on the performance of their components and issue maximum permissible contamination levels They state that operating components on IX It should be noted that the recommendations made in this table should be viewed as starting levels and may have to be modified in light of operational experiences or user requirements RECOMMENDATIONS 51 APPENDIX E fluids which are cleaner than those stated will increase life However the di versity of hydraulic systems in terms of pressure duty cycles environments lubrication required contaminant types etc makes it almost impossible to predict the components service life over and above that which can be rea sonably expected Furthermore without the benefits of significant research material and the existence of standard contaminant sensitivity tests manufac turers who publish recommendations that are cleaner than competitors may be viewed as having a more sensitive product Hence there may be a possible source of conflicting information when com paring cleanliness levels recommended from different sources The table gives a selection of maximum contamination levels that are typ ically issued by component manufacturers These relate to the use of the correct viscosity mineral fluid An even cleaner level may be needed if the operation is severe such as high frequency fluctuations in loading high tem perature or high failure risk 52 RECOMMENDATIONS APPE
26. ent systems e A procedure for determining the performance of APCs so that minimum acceptable levels can be set by the user e Improved calibration techniques and procedures e More accurate calibration e Improved levels of particle count reproducibility with different equip ment e More accurate and consistent filter test results Effect on Industry The introduction of ISO MTD has necessitated changes to certain ISO stan dards 56 New ISO STANDARD TEST DUST AND ITS EFFECT ON ISO APPENDIX G The standards affected include ISO 4402 1991 Hydraulic fluid power Calibration of liquid automatic particle counters ISO 4406 1987 Hydraulic fluid power Code for defining the level of contamination by solid par ticles ISO 4572 1981 Hydraulic fluid power Filters Multi pass method for evaluating filtration performance of a filter element In order that users are not confused by the changes to these standards par ticularly by reference to them in technical literature ISO is updating 4402 to ISO 11171 and 4572 to ISO 16889 Two standards which concern our industry are the ISO 4406 coding system and the new ISO 16889 Multi pass test As APCs will henceforth count parti cles more accurately there will now be a change in the way sizes are labelled In the new ISO 4406 1999 new calibration sizes are used to give the same cleanliness codes as the old calibration sizes of 5 and 15 um In this way there will be no nec
27. essity to change any system cleanliness specifications It is proposed that the cleanliness codes for APCs will be formed from three particle counts at 4 6 and 14 um with 6 and 14 um corresponding very closely to the previous 5 and 15 um measurements This will ensure consistency in data reporting As the counts derived by microscope counting methods are not affected the particle sizes used for microscopy will remain unchanged i e at 5 and 15 um The option of quoting just two counts of 6um and 14um for APCs remains New ISO STANDARD TEST DUST AND ITS EFFECT ON ISO 57 APPENDIX G To clarify matters still further ISO standards written around the new test dust will utilize a new identifier c Hence um sizes according to the new ISO 11171 will be expresses as um c and Beta ratios according to ISO 16889 will be expressed as Bx c e g B5 c However it must be stressed that the only real effect users will experience will be the improved accuracy in particle counts there will be no change in the performance of filters nor in the ISO cleanliness levels that they will achieve The following charts shows the correlation between the old ACFTD and the new ISO MTD The LPA is calibrated with ISO Medium Test Dust to ISO 11171 The correlation between particle sizes and the ACFTD old standard to the ISO MTD new standard is as follows ACFTD 1 5 15 25 30 50 75 100 ISOMTD 4 6 14 2
28. inction principle whereby 2 laser light systems shine through the fluid and lands on photodiodes When a particle passes through the beam it reduces the amount of light re ceived by the diode and from this change in condition the size of the particle can be deduced Hydraulic and Lubricating Systems consists of sets of continuously moving metal parts which use hydraulic fluid as the power medium Hydraulic fluid is also used to create a lubrication film to keep the precision parts separated and it is also used as a cooling medium The very nature of a hydraulic system is that it produces solid par ticulate contaminants and these are ever present in all hydraulic sys tems There is a revised standard ISO cleanliness code ISO 4406 1999 which classifies the numbers of particles that can be tolerated within the system and it is these levels of contaminants that the par ticle counter is designed to measure ISO Cleanliness Code The international standard for reporting solid contami nants is ISO4406 1999 this standard has been revised to incorporate the change to ISO Medium Test Dust as the calibration standard 6 Introduction Cit An ALY SER CCC GG GJGJG GC DEEE Battery charging indicator Printer Serrated Paper Cutter Screen Flush valve push button On Off Keyboard HP connector Minimess 10 Waste connector Quick coupling 11 RS232 connector 12 DC power input socket 13 Plug to external circuits
29. ing Total discharge will shorten the battery lifetime so should be avoided where possible Battery Charging 37 11 Printer Paper To access the thermal printer remove the four thumbscrews securing the cover and serrated paper cutter Thermal printer paper is sensi tised on one side only and must be fed into the printer mechanism as shown below SERRATED CUTTER THERMAL PRINT HEAD ROLLER Figure 11 1 Printer Mechanism Using a finger press down on the print head spring at position A and tilt the print head to the open position by pulling it back at point B B A Figure 11 2 Print Head Spring Feed the paper under the roller and pull the paper end out of the mechanism Return the print head back to its normal position by pressing on the green lever at point C Ensure that the print head spring has returned to the position shown above 38 Printer Paper IMPORTANT The thermal printer must not be operated with out paper as this will damage the printer Therefore replace the roll when the end of the roll indication appears on the paper Printer Paper 39 12 12 1 12 2 Computer Analysis Software Installation Install software Pt No 6 126 on to a suitable PC running Windows XP or later Follow instructions as detailed in the LPA2 View User Manual Results Download Connect RS232 cable to Analyser and PC via an appropriate port Switch ON the Analyser Switch ON the PC
30. les mpfiltri co uk Website www mpfiltri com ITALY HEADQUARTERS MP FILTRI SpA Via 12 Maggio n 3 20060 Pessano con Bornago Milano Italy Tel 39 02 95703 1 Fax 39 02 95741497 95740188 Email sales mpfiltri com Website www mpfiltri com CHINA MP FILTRI Shanghai Co Ltd 1280 Lianxi Road 8 Bld 2 Floor Shanghai Pudong 201204 P R China Tel 86 21 58919916 Fax 862158919667 Email sales mpfiltrishanghai com Website www mpfiltri com GERMANY MP FILTRI D GmbH Am Wasserturm 5 D 66265 Heusweiler Holz Tel 49 06806 85022 0 Fax 49 06806 85022 18 Email service mpfiltri de Website www mpfiltri com FRANCE MP FILTRI FRANCE B P 65 74501 Evian Cedex Tel 33 04 50 71 64 80 Fax 33 04 50 71 73 32 Email mpfiltrifrance wanadoo fr CANADA MP FILTRI CANADA INC 380 Four Valley Drive Concorde Ontario L4K 5Z1 Tel 1 905 303 1369 Fax 1 905 303 7256 Email mail mpfiltricanada com Website www mpfiltricanada com RUSSIAN FEDERATION MP FILTRI RUSSIA Shenkursky proezd 3 Building B Office 308 127349 Moscow Tel Fax 7 495 601 34 83 GSM 7 495 502 54 11 Website www mpfiltri ru USA MP FILTRI USA Inc 2055 Quaker Pointe Drive Quakertown PA 18951 Tel 1 215 529 1300 Fax 1 215 529 1902 Email sales mpfiltriusa com Website www mpfiltriusa com
31. o 5 inclusive to select the appropriate Analyser settings On the Settings Screen press 5 repeatedly until Continuous is se lected Test Options 6 Press relevant key to switch between option selections Enter MINUTES BETWEEN TESTS Press 1 then input the time in minutes that is required between the end of a test and the beginning of a new test Input a value between 1 and 30000 followed by lt RETURN Selects between LOG EVERY TEST ON and LOG EVERY TEST OFF Selecting Log Every Test Off will only store the results of the test when the Clean alarm Level is achieved this saves memory space Continuous Sampling 23 Confirm Cleanliness Level Press 3 to turn CONFIRM CLEANLINESS LEVEL On and Off Selecting CONFIRM CLEANLINESS LEVEL ON instructs the Analyser to repeat the sampling cycle until the Clean alarm level has been achieved in two consecutive samples before the Completed sta tus is displayed Selecting CONFIRM CLEANLINESS LEVEL OFF permits the Clean alarm to be achieved only one time before the Completed status is displayed Clean Alarm Level ISO Press 4 then input desired Clean Alarm Level in the Code for mat Number Number Number any code number combination can be input from code 5 to 24 example 10 9 5 For continuous testing until the ISO Code is achieved selected ISO Format as described under the previous section on page 11 Analyser Settings instruction 4 1 Testing will au
32. or is connected to Analyser DC Power Input Socket Check that the fluid sampling hose has been fully connected at both the system and Analyser ends Confirm that there is a free flow of fluid to the Analyser by depressing the Flush Valve and ob serving fluid passing into the waste disposal bot tle High water aeration levels If suspected contact MP Filtri for further advice If excessive system contamination is suspected flush out the Analyser using a Bottle Sampling Unit in conjunction with a suitable solvent The standard LPA and the standard Bottle Sampling units are both fitted with Nitrile seals so Petroleum Ether may be used for this purpose Petroleum Ether is not compatible with seals manufactured from EPDM which are used in the Skydrol version of the 250 Bottle Sampling unit DO NOT USE ACETONE FAULT FINDING 67 APPENDIX K 68 FAULT FINDING Produced by MP Filtri UK Revision 14 As a policy of continual improvement MP Filtri UK reserve the right to alter specifi cations without prior notice Except as permitted by such licence no part of this publication may be reproduced stored in retrieval system or transmitted in any form or any means electronic me chanical recording or otherwise without prior written permission of MP Filtri UK MP FILTRI UK Limited Bourton Industrial Park Bourton on the Water GL54 2HQ UK Tel 44 01451 822522 Fax 44 01451 822282 Email sa
33. s levels 54 HYDRAULIC SYSTEM TARGET CLEANLINESS LEVELS APPENDIX G New ISO Standard Test Dust and its effect on ISO Contamination Control Standards When General Motors gave advance warning to the International Standards Organization ISO that it was intending to stop the production of AC Fine Test Dust ACFTD work commenced immediately on finding an improved replacement dust ACFTD was used extensively within the fluid power and automotive industries for calibrating Automatic Particle Counters APCs and for the testing of components APCs are used for testing oil filters and also for contaminant sensitivity test ing of hydraulic components For 25 years APCs have been the main stay in the measurement of solid particles in hydraulic fluids The growth in demand for measuring fluid cleanliness in a variety of industrial processes including fluid power has resulted in APCs moving from the laboratory environment out into the factory In fact they are now a critical part of many production processes It is therefore essential that the data they provide is both accurate and consistent Calibration ACFTD has been used as an artificial contaminant since the 1960s and its original particles size distribution was determined using an optical micro scope This particle size distribution subsequently formed the basis of ISO 4402 the method for calibrating APCs Due to the limitations of that method of measurement the particle size distrib
34. screen also setting the appropriate result format to ISO NAS or AS4059 as described on page 12 Both relays are initially off and remain off until an alarm level has been reached exceeded The following illustrates the switching logic of the Relays Relay 1 Dirty NAS AS4059E 1 single number result gt set limit On result lt set limit Off ISO AS4059E 2 multi part any result gt corresponding set limit On all results lt corresponding set limit Off Relay 2 Clean NAS AS4059E 1 single number result lt set limit On result gt set limit Off 30 Alarms ISO AS4059E 2 multi part all results lt corresponding setlimit On any result gt corresponding set limit Off Alarm Modes 3 and 4 These are reserved for future development Alarms 31 7 Wiring The LPA contains two solid state relays which can be used to switch an external circuit when using the Continuous Test mode The func tion of these relays for Alarm Mode 1 is shown in the following sim ple wiring diagrams using a battery and bulb circuit for illustrative purposes Each relay is designed for a maximum current of 1 amp at 24 volt nominal AC or DC absolute maximum 60 volt peak Operation above these limits will cause irreparable damage to the relays If the User needs to switch voltages currents in excess of the above maximum limits then separate higher rated interposing relays will need to be incorporated into the final electrical scheme de
35. signed by the User Common Terminal 1 Plug to Terminal 3 external circuits 32 Wiring 3 pin plug mure Relay 2 hs rLF Socket case wai supplied loose Example 1 Bulb illuminates when Clean alarm level is achieved completed status and is off during sampling Wiring 3 pin plug Relay 1 e in gt Y io T7 I Relay 2 CPR i Socket case wal if supplied loose Example 2 Bulb illuminates during sampling and extinguishes when Clean alarm level is achieved 3 pin plug completed status Relay 1 is also closed during Normal Dynamic Triple amp Bottle and Short test types Relay will open when stop button is pressed 33 8 Bottle Sampling An alternative to operating on line is to use MP Filtri s Bot tle Sampling Unit to test oil contained in bottles Refer to the separate User Guide for details 34 Bottle Sampling 9 Data Logging Press the Log button 6 to access results stored within the Analyser s memory the Log Screen will be displayed 1 Transfer Log 2 Clear Log 3 Clear Last 4 Recall 5 Print Press a Key to Choose or 0 to Exit SS To view the contents of the Analyser s memory progress through the following routine e Select 4 Recall and enter the number of the test to be retrieved e If the test number is not known enter the last test number and scroll through the memory u
36. sing Next or Previous to se lect the required result e To print the result press 0 quit then 5 Print A hard copy of the result will then be printed 6 The result printed will be viewed in the Result Presentation Options format from the Set function Data Logging 35 10 Battery Charging The Analyser is equipped with an internal rechargeable battery ca pable of sustaining 8 hours continuous operation following a 24 hour charging period approximately 100 tests To conserve battery power the LCD screen is illuminated at a re duced level when the Analyser is operated without an external power supply connected When the Low battery level indicator is displayed the Analyser requires recharging as soon as possible BEFORE COMMENCING RECHARGING always press RED button to switch off the Analyser To recharge connect lead from power adaptor to the DC power input socket on the Analyser Observe that the battery charging indicator illuminates on the Analyser Battery power may be conserved by e Operating Analyser whilst connected to power adaptor e Switching Analyser OFF between samples e Turning Auto Print Mode OFF Should the battery become completely discharged it is advisable to allow a minimum of 15 minutes charge time prior to commencing a test The Analyser must remain connected to the power adaptor during subsequent tests until the battery has had time to recharge 36 Battery Charg
37. staller has completed plug in the USB to Serial Adaptor A message should pop up indicating successful hardware installation Note any COM port number indicated in the message COM Ports 65 APPENDIX J e Connect the LPA to the computer using the Serial lead and the USB to Serial Converter e Ifneccessary determine the COM port allocated by the computer for this device using the procedure following Determining the COM Port To check the COM port number allocated by the computer for the Serial lead or the USB to Serial Connector e Windows 2000 Windows XP Windows Vista Right click on My Computer icon and then left click on Properties Click on the Hardware tab and then click on the Device Manager But ton Click on the plus sign next to Ports COM amp LPT Windows 7 View the installed devices using Start Button Devices and Printers You should see an icon representing the port Communications port if using the Serial lead Aten USB to Serial Cable or Prolific USB to Serial Comm Port if using an adaptor cable Either of these will have a COM number after it This is the number you should use when selecting the Com Port 66 COM Ports FAULT LCD Screen remains blank after switching on Unexpected results obtained from sample APPENDIX K Fault Finding CHECK Check that Analyser had been put on charge pre viously Check that LED illuminates when power adapt
38. tomatically continue until each of the three num bers in the Code have been achieved or better Clean Alarm Level NAS1638 AS4059E 1 Press 5 then input desired Clean Alarm Level as a single Class number in the range 2 to 12 inclusive example 6 For continuous testing until the NAS1638 AS4059E 1 Class is achieved select NAS Format or AS4059E Table 1 as de scribed in Analyser Settings page 11 instruction 4 1 Test ing will automatically continue until the Class number has been achieved at each of the five micron size ranges covered by NAS 24 Continuous Sampling 1638 amp AS4059E Table 1 Note AS4059E 1 denotes Table 1 of the AS4059E standard 6 Clean Alarm Level AS4059E 2 Press 6 then input desired Clean Alarm Level in the format 1A 2B 3C AD 5E 6F in the following range Size Code A 000to 12 Size Code B 00 to 12 Size Code C 00 to 12 Size Code D 2 to 12 Size Code E 4 to 12 Size Code F 7 to 12 Example 4A 4B 5C 6D 6E 7F For continuous testing until the AS4059E Table 2 size codes are achieved select AS4059E TABLE 2 FORMAT as described in Analyser Settings page 11 instruction 4 1 Testing will auto matically continue until the Class number has been achieved at each of the six Size Codes Also the LPA2 will handle deviations from the above format intelligently The size code can be out of order 7F 4A 5C 4B 6E 6D If any sizes are missing they will be assigned the
39. us Sampling 4 1 Important Do not connect Waste Fluid Hose to a pressurised system as this will cause the Analyser to malfunction and could cause internal leakage The Waste Fluid Hose must be discharged into a tank vessel vented to atmosphere To conserve battery life the Analyser should be permanently con nected to the power adaptor when it is operated in the continuous sampling mode Continuous Sampling Basic Operation See page 11 instructions to 5 inclusive to select the appropriate Analyser settings On the Settings Screen press 5 repeatedly until CONTINUOUS is selected Test Option Press 6 Then press the relevant key to switch between option selections Sets the MINUTES BETWEEN TESTS Press 1 then input the time in minutes that is required between the end of a test and the beginning of a new test Input a value between 1 and 30000 followed by RETURN selects between LOG EVERY TEST ON and LOG EVERY TEST OFF Selecting LOG EVERY TEST OFF will store none of the test results in the Analyser s memory is used to input the Clean Alarm Level ISO Enter a value of 0 zero if not used Continuous Sampling 21 is used to input the Clean Alarm Level when using the NAS1638 AS4059E 1 format Enter 0 if not used 6 is used to enterthe Clean Alarm Level when using the AS4059E 2 format Enter 0 if not used This Alarm Level will now be dis played as A B C D E F Press the FLUSH
40. ution was questioned below about Sum It was also not traceable to any national standard of measurement a critical requirement for today s quality management systems There was also an absence of formal controls over the distribution of the test dust and batch to batch variability was much greater than is acceptable nowadays New ISO STANDARD TEST DUST AND ITS EFFECT ON ISO 55 APPENDIX G ISO therefore defined the requirements for the replacement for ACFTD and asked the National Institute of Standards and Technology NIST in the USA to produce a standard traceable reference material The new dust s parti cle size distribution has been accurately determined with the aid of modern scanning electron microscope and image analysis techniques New Test Dust Benefits The new ISO Medium Test Dust ISO MTD consists of similar materials to the old ACFTD but to minimize particle counting errors it is of a slightly coarser grade because ACFTD included too many particles smaller than Sum which gave problems during testing ISO MTD is produced to a standard distribution and stringent quality control procedures thereby ensuring excellent batch to batch repeatability These procedures combined with a revised ISO APC calibration method give e A traceable and controlled reference test dust with greatly reduced vari ation in particle size distribution This gives the trace ability required by ISO 9000 QS9000 and similar quality managem
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