FED-STD-791D
5.
MATERIALS
Solvent Hexanes (certified) filtered through a ≤ 0.45 µm (Millipore HAWP 047 or
5.1
equivalent) filter prior to use.
5.2
Detergent Micro-90 Cleaning solution (available through Fisher Scientific and Cole-
Parmer) or equivalent.
6.
PROCEDURE
CALIBRATION
6.1
6.1.1 Particle counters will be calibrated every 6 months, and after any repairs that could affect
calibration or whenever there is a reason to suspect inaccuracy in test results.
6.1.2
Instrument calibration will be performed using a certified calibration kit consisting of a
known suspension of Arizona Certified Fine Test Dust (ACFTD) in MIL-PRF-5606
(NATO Code H-515) hydraulic fluid by qualified personnel and adhering to the
manufacturer's operations manual.
SAMPLER BOTTLE PREPARATION
6.2
6.2.1 Wash sample bottle thoroughly with warm tap water containing detergent.
6.2.2
Rinse with warm tap water.
6.2.3
Rinse with either distilled or deionized water.
6.2.4
Oven dry at 90 ± 5°C.
6.2.5
Allow to cool at room temperature in a suitable contamination-free environment.
6.2.6
Rinse with filtered solvent.
6.2.7
Drip dry.
6.2.8
Store bottles with caps in place at room temperature, in a suitable contamination-free
environment.
6.3
SAMPLE PREPARATION
6.3.1
Bottle sample.
6.3.1.1 Fluid samples shall be rejected if visibly contaminated with water or excessive solids.
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