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AEROSPACE
RECOMMENDED
PRACTICE ARP598REV.C
Issued
1960-03Revid 2003-01Superding ARP598B
(R)Aerospace Microscopic Sizing and Counting of Particulate
Contamination for Fluid Power Systems
FOREWORD
Of the methods available for determining the level of particulate contamination in aerospace hydraulic fluids the most predominant have been gravimetric, microscopic counting (this document), automatic particle counting and membrane.
Gravimetric analysis results cannot be related to any specific particle count or related contamination class. Automatic Particle Counters (APCs) calibrated with AC fine test dust provide results class compatible with this document; however AC test dust is no longer manufactured and u of this calibration procedure is being phad out. Membrane standards can be made compatible to both the above. Results obtained by each of the three methods from identical bottled samples may not be equivalent due to individual idiosyncrasies in each technique. Other APC variants, which will be coming into incread u, are calibrations using new ISO test dusts, on-line counting systems and portable APCs. Current results indicate the will not be compatible with this document.
TABLE OF CONTENTS
1.SCOPE (4)
2.APPLICABLE DOCUMENTS (4)
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2.1SAE Publications (4)
2.2AIA Publications (4)
3.OUTLINE OF METHOD (5)
4.MATERIALS (5)
5.APPARATUS (5)
5.1Filtration Apparatus (5)
5.2Particle Count Apparatus (6)
6.REAGENTS (6)药妆品牌有哪些
6.1Aqueous (6)
6.2Alcohols (6)
6.3Rin Liquid (7)
6.4Cleanliness (7)
7.PREPARATION OF APPARATUS (7)
8LIQUID SAMPLES (7)
9.FILTRATION PROCEDURE (8)
9.1Blank Analysis Filtration (8)
9.2Sample Filtration (8)
10.MICROSCOPE CALIBRATION (9)
11.PARTICLE COUNTING PROCEDURE (11)
12.PARTICLE COUNT CALCULATION (13)
醉文明13.COUNTING PROFICIENCY (13)
14.DISPUTE CLAUSE (13)
TABLE OF CONTENTS (Continued)
15.KEY WORDS (14)
16.NOTES (14)
APPENDIX A CALIBRATION OF MICROSCOPE OCULAR SCALE (15)
APPENDIX B ARP598 FLUID CLEANLINESS DATA SHEET (16)
1.SCOPE:
This SAE Aerospace Recommended Practice (ARP) defines the materials, apparatus and procedure for sizing and counting of particulate contamination, 5 µm or greater, in hydraulic fluid samples by membrane filtration with microscopic counting.
It is capable of counting particulate matter in samples withdrawn from fluid power systems as identified by the 12 class of AS4059 or NAS 1638 and projected beyond the for the five standard ranges specified and can thus rve as the primary document to determine acceptability.
It is also capable of revealing but not measuring evidence of abnormal amount of water, other fluids, fine particulate and other materials, especially fibers and metals.
It is applicable to all military, civil, space vehicles and test equipment.
2.APPLICABLE DOCUMENTS:
得不到的幸福The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purcha order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, superdes applicable laws and regulations unless a specific exemption has been obtained.
2.1SAE Publications:
汉口花园Available from SAE, 400 Commonwealth Drive, Warrendale, PA., 15096-0001.
AS4059Aerospace Cleanliness Classification for Hydraulic Fluids
ARP4285Aerospace - Evaluation of Particulate Contamination in Hydraulic Fluid - Membrane Procedure
ARP5376Aerospace - Methods, Locations and Criteria for System Sampling and Measuring the Solid Particle Contamination of Hydraulic Fluids
科二倒库技巧AS1241Fire Resistant Phosphate Ester Hydraulic Fluid for Aircraft
2.2AIA Publications:
Available from Aerospace Industries Association, 1250 Eye Street, NW, Washington, DC 20005.
NAS 1638Cleanliness Requirements of Parts Ud in Hydraulic Systems (Inactive for new design)
3.OUTLINE OF METHOD:
A known volume of hydraulic fluid is filtered through a gridded membrane filter to give an even
distribution of particulate matter on the membrane. The residual contamination is then sized into five defined size ranges and counted by microscopic analysis.
4.MATERIALS:
4.1Membrane filter, 47 mm in diameter with a pore size less than 1.0 µm. The filter shall have imprinted
grid of 3.10 mm ± 0.02 mm centers. The color shall be chon for maximum contrast with the
particulate contamination to be obrved. As defined in ARP4285, when testing petroleum ba hydraulic fluid or synthetic hydrocarbon fluid white cellulo ester membrane is required. Phosphate Ester fluid, (e AS1241) requires the u of polytetrafluoroethylene (PTFE) type membranes
material (or other equivalent material).
4.2Membrane filter 25 mm as filtering disc for rin dispenr 1 µm or smaller.
4.3Plastic film, 0.05 mm (0.002 in) minimum thickness. The film shall be compatible with sample and
rin liquids (pressure dispenr) or 3 µm (manual dispenr).
5.APPARATUS:
5.1Filtration Apparatus:
5.1.1Petri dishes, plastic or glass. If plastic, it shall be compatible with sample and rin liquids.
5.1.2Sample bottles, should preferably be made from glass, small mouth, screw cap, permanently
marked to indicate sample volume. The bottle should have a nominal capacity of 250 mL and a minimum capacity of 150 mL and should be aled by means of caps (preferably of phenolic resin), which will not cau contamination. Otherwi a non-flaking plastic film compatible with the
hydraulic fluid should be ud. Bottles made of non-flaking polyethylene have also been ud with success (e ARP5376).
5.1.3Funnel, Filtration:The lower hole shall have a diameter of approximately 35 mm ID. The effective
文明旅游宣传标语filtering area shall be calibrated by filtering a contrasting particulate pigment through a membrane filter. The diameter of the residual pigment shall be measured at quadrature diameters with
resulting area 960 mm2 ± 25 mm2. If the receiving funnel is to be ud for measuring the sample volume, the funnel shall be calibrated within ±2% of the required volume.
5.1.4Membrane Filter Support:Either a fritted glass, sintered metal or stainless steel screen may be
ud. The support shall be so designed as to enable attachment to a vacuum source.
5.1.5Vacuum Flask: A 1 L filtering flask is ud to mount the membrane filter support and funnel
asmbly. Vacuum is applied to the flask to draw the sample fluid through the filter.
