ASTM D4285 Standard Test Method for Indicating Oil or Water in Compressed Air
3. Apparatus and Materials
3.1 Absorbent Collector, such as white absorbent paper or cloth and rigid backing for mounting absorbent collector, or
3.2 Nonabsorbent Collector, such as rigid transparent plastic, approximately 1/4 in. thick.
4. Cautions
4.1 To avoid false indications prior to testing:
4.1.1 Allow compressed air system to reach operating conditions, and
4.1.2 Allow air to discharge at operating conditions to remove accumulated condensation in the system.
4.2 Fasten the collector material to the rigid backing. Precaution: Avoid personal contact with the air stream.
5. Sampling
5.1 Conduct the test on discharging air as close to the use point as possible and after the inline oil and water separators.
