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lubricant generated insoluble color bodies test method
standard test method for
measurement of lubricant generated insoluble color
bodies in in-service turbine oils using membrane patch
colorimetry
this standard is issued under the fixed designation d7843;the number immediately following the indicates the year of original adoption or, in the case of revision, the year of last revision. a number in parentheses indicateas the year of last reapproval. a superscript epsilon (ε) indicates an editorial change since the last revision or reapproval.
1. scope*
  1.1 this test method extracts insoluble contaminants from a
samnnple of in-service turbine oil onto a patch and the color of the membrane patch is analyzed by a spectrophotometer. the
results are reported as a δe value, within the cie lab scale.
1.2 this test method is not appropniate for turbine oils with dyes.
  1.3 the values stated in si units are to be regarded as
standard. no other units of measurement are included in this
standard.
  1.4 this standard does not purport to address all of the
safery concems, if any, associated with its use. it is the
responsibility of the user of this standard to establish appropriate safer and health practices and determine the applica
bility of regulator limitations prior to use.

2. apparatus
  2.1 vanations of apparatus, particularly with respect to filter membranes and vacuum pump setting, can affect the test results significantly.
  2.2 when the user of this test method uses an altemate
membrane filter. it is incumbent upon them to establish that the alternate filter will give equal results.
  2.3 regared apparatus:
  2.3.1 membrane filter, 47 mm nitro-cellulose,0.45µm.
  2.3.2 forceps, smooth-trp.
  2.3.3 borosilicate filter holder.
  2.3.4 borosilicate filtering flask.
  2.3.5 wash bottle equipped with 0.22 µm membranes.
  2.3.6 vacuum source, capable of maintaining a vacuum of
71kpa鍦?kpa.
  2.3.7 graduated cylinder, 150 ml to 200 ml.
  2.3.8 beaker, 100 ml to 250 ml.
  2.3.9 petri dish.
  2.3.10 spectrophotometer, with capabilities of analyzing a standard 15 mm target with a 0藲/45藲 measuring geometry, 10藲 observer, 10 nm spectral intervals minimum resolution, the visible spectral range of 400 nm to 700 nm and cielab
measuring indices.

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