FED-STD-791D
Method 3012
September 7, 2007
DETERMINATION OF PARTICULATE MATTER IN AEROSPACE HYDRAULIC FLUIDS
1. SCOPE
1.1
This method describes the determination of particulate matter in aerospace hydraulic
fluids with an automatic particle counter analyzer working on the light interrupt principle.
This document when cited in product specifications becomes a mandatory test
requirement.
2.
SUMMARY
2.1
This method utilizes an automatic particle counter with a minimum of five channels,
fitted with photoelectric level detectors, a liquid sensor suitable for counting particles in
the 2-400 m range size, and an automatic bottle sampler with a built-in pressure/vacuum
chamber that can subject samples to pressures up to 60 psi. The particle counter must be
able to deliver flow rates of 10 to 200 mL/min, handle a minimum sample volume of 100
mL and have a minimum concentration limit of 10,000 particles/mL.
3.
SAMPLE SIZES
3.1
Minimum sample size for analysis is 120 mL (4 oz).
4.
STANDARDS AND APPARATUS
4.1
Automatic particle counter with a minimum of five channels, fitted with photoelectric
level detectors, a liquid sensor suitable for counting particles in the 2-400 m range size,
and an automatic bottle sampler with a built-in pressure/vacuum chamber that can subject
samples to pressures up to 60 psi.
4.2
Sample bottles - Round flat-bottomed glass bottles fitted with a polypropylene threaded
cap forming a seal with the bottle without the use of any insert, approximately 250 mL
capacity or manufacturer's recommended size.
Solvent dispenser Suitable dispensers fitted with a ≤0.45 m membrane filter
4.3
(Millipore HAWP 047 or equivalent) at the outlet. If solvent has been pre-filtered using a
0.45 m or smaller size filter, then an inline filter is not required.
4.4
Timer - Timer that is accurate to the second, 0.5.
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