Standard Test: Hydraulic/Circulating oils

Hydraulic systems, including automatic powershift transmissions, require the fluid's viscosity to be low enough to minimize friction loss, yet high enough to prevent fluid leakage and provide satisfactory protection against wear, and should have good oxidation stability to prevent sludge from forming.

Several methods are used to analyze oil condition and contamination. This standard test includes:

  • Elemental Metals (24) by ICP (or Spectroscopy)

    Elemental Analysis, or Spectroscopy, identifies the type and amount of wear particles, contamination and additives. Determining metal content can alert you to the type and severity of wear occurring in the unit. Measurements are expressed in parts per million (ppm). It provides rapid screening of used oils for indications of wear.

  • Karl Fischer Water ppm

    This test produces iodine when electricity is conducted across a mesh screen. The current needed to create iodine and remove existing water is measured and converted to parts per million (ppm).

  • Viscosity @ 40°C or 100°C

    ASTM test uses a constant temperature bath. The efflux time is measured between two points. The viscosity is computed by using a calibration constant and the efflux time. Viscosity is reported in centistokes (cSt) at 40ºC or 100ºC.

  • Total Acid Number (TAN)

    TAN is a measure of the total concentration of acids, both weak and strong, present in the oil. It is an indicator of oil health. Useful in monitoring acid buildup in oils due to depletion of antioxidants. High acid levels can indicate excessive oil oxidation or depletion of oil additives, which can lead to corrosion of the internal components.

  • ISO Particle Count

    As particles in the oil flow pass a laser, the laser light is blocked allowing individual particles to be counted and sized. The resulting data is a distribution of the concentration of particles in various size ranges.

Sample bottle size: 90 ml.

*Note: see page 10 – ISO 4406 Cleanliness Codes


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