FED-STD-791D
Table 1 SAE AS 4059 (NAS 1638) Class 00
Number of Particles / 100 mL
Particle Size Range (m)
(max)
5 - 15
125
16 - 25
22
26 - 50
4
51 - 100
1
>100
0
6.5
SAMPLE ANALYSIS
6.5.1
Shake the bottle vigorously by hand for one minute. Particle counting shall commence
within two minutes after shaking.
6.5.2
Place sampler bottle in sample assembly and apply a vacuum of at least 53.5 kPa (15.8 in
Hg) for 40 seconds to remove air bubbles.
6.5.3
Turn-off vacuum source and immediately start particle count.
6.5.4
Flush the sensor with a small volume of sample.
6.5.5
Record count result per calibrated channel.
6.5.6
Repeat sample counting as appropriate.
6.5.7
After each sample run, flush the sensor with filtered solvent.
7.
CALCULATIONS
7.1
Average the particle count of the runs (discarding any statistically suspect data) per
volume used per channel.
8
REPORTING
8.1
Report to no more than three significant figures, the number of particles per 100 mL in
the following size ranges: (DELTA mode).
5 to 15 m
16 to 25 m
26 to 50 m
51 to 100 m
99
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