MIL-PRF-83861D
element pressure drop shall not exceed the clean element pressure drop in table I after
performing the cold start test.
4.6.3.1 Media migration. During the first and tenth cycles of the test in 4.6.3, using filter
element number four, 500 milliliter (mL) of test fluid shall be collected after passing through the
filter element. Prior to collecting the test fluid samples, the sampling line, fittings and valve shall
be flushed. The fluid shall be analyzed in accordance with the procedures in SAE-ARP785 and
the abrasion migration test in 4.6.8. The weight of contaminant collected in each sample shall be
multiplied by four and shall not exceed the abrasion migration value shown in table I.
4.6.4 Efficiency. The efficiency for filter elements is computed as specified in 4.6.4.1
and shall meet the contaminant removal by weight specified in the efficiency test in table I.
4.6.4.1 Efficiency computation.
A - (B - C)
Efficiency = x 100
(1)
A
where:
A = add value
B = contaminant value
C = blank value
4.6.4.2 Contaminant value (B). The filter element shall be installed in a test filter
housing and placed in a test system (see figure 5) which has been previously flushed with pre-
cleaned test fluid (see 4.4.1.1). Test fluid (2,000 mL) shall be added to the test system. Then, a
slurry containing the add value of contaminants shown in table 1 shall be mixed with the test
fluid. The test fluid, at the rated flow specified in table I, shall be passed through the filter
element and then through a previously cleaned and weighed filter membrane (0.8 micron
absolute) (see 6.5). The test fluid shall be collected and the filter membrane weighed. The
difference in weight between the filter membrane before and after this procedure is the weight of
contaminant passing through the filter element and is the contaminant value (B) in equation 1.
4.6.4.3 Add value (A). A free-flow dummy element shall be installed in a test filter
housing and the procedure in 4.6.4.2 shall be repeated four times. The add value (A) in equation
1 is the average of the weights of contaminant collected in the four runs. The weight of the
contaminant collected in each of the four runs shall be 95% or more of the weight of the
contaminant added.
4.6.4.4 Blank value (C). The filter element shall be installed in a test filter housing and,
with no contaminant added; the procedure in 4.6.4.2 shall be repeated. The weight of
contaminant collected is the blank value (C) in equation 1. The blank value is the weight of
contaminant attributed to the test system and filter element and shall be less than 0.0007 gram.
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