Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
권호 표지
DOI QR코드

DOI QR Code

Monitoring of Cleanliness Level in Hydraulic Systems: Obtaining Reliable On-Line data

  • Published : 2012.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

Monitoring of system cleanliness levels and counting of particulate contaminant are fundamental to achieving hydraulic system reliability as any departure from the specified cleanliness level is often a precursor to future failures. On-line monitoring of cleanliness levels has the advantage of giving data both very quickly and accurately as environmental influences are eliminated. In this way, corrective actions can be promptly implemented. Most on-line instruments are sensitive to system conditions to a greater or lesser extent, but Automatic Particle Counters (APCs) working on light extinction principles are especially sensitive to the presence of optical interfaces caused by such conditions as fluid mixtures, emulsions, free water and air bubbles. These conditions give erroneous data and can result in drawing incorrect conclusions, wasting maintenance time and ultimately, reduced user confidence in cleanliness monitoring. This paper describes such conditions and shows how the correct selection of the analysis technique can result in reliable cleanliness level data.

Keywords

References

  1. M. J. Day, "Condition Monitoring of hydraulic system" Chapter 10, Handbook of Condition Monitoring, ed BKN Rao, Advanced Technology, Oxford, UK, 1996, ISBN/856172341.
  2. E Rabinowicz, Lecture presented to the American Society of Lubricating Engineers, Bearing Workshop, USA, 1981.
  3. DTI, "Contamination control in fluid power systems, Vol 1 Field Studies," Department Trade and Industry, N.E.L., Glasgow, UK., February 1984.
  4. T.M. HUNT "Handbook of wear debris analysis and particle detection in liquids" published by Chapman & Hall, London 1993, ISBN 1-85166-962-0.
  5. M. J. Day & J. Rinkinen: "Contaminant monitoring of hydraulic systems - the need for reliable data", Presented at COMADEM 97, Tampere University of Technology, Tampere, Finland, 1997.
  6. ISO 4406: Hydraulic Fluid Power - Fluids - Method For Coding Level of Contamination by Solid Particles, International Standards Organisation, Geneva, Switzerland, 1999.
  7. J-h. Hong & M. J. Day: "Filter Blockage Technique,- Monitoring of the Cleanliness in Hydraulic Systems", Pp150-Pp159, The Proceedings of Korea Fluid Power System Fall Conference, October 22, 2008, Incheon, Korea
  8. ISO 11171:- "Hydraulic fluid power - "Calibration of automatic particle counters for liquids" International Standards Organization, Geneva, Switzerland
  9. ISO 21018-3.: "Hydraulic fluid power - Monitoring the level of particulate contamination of the fluid - Part 3: Use of the filter blockage technique", International Standards Organization. Geneva, Switzerland.

Cited by

  1. Hydraulic System Onboard Monitoring and Fault Diagnostic in Agricultural Machine vol.62, pp.None, 2019, https://doi.org/10.1590/1678-4324-2019180363