How Are Samples Taken?

An efficient condition monitoring programme requires a sample that is representative of the system from which it was taken. The sample must also be uniquely identified by machine, component and sample interval. Details of oil changes, service repairs and operational environment should also be recorded to the sample.

Ideally, sampling valves are designed into the system so that a representative sample may be drawn off through a valve without risk of external contamination. Where this is not possible, a vacuum pump or syringe with flexible tubing attached is an acceptable alternative. The tube should be carefully inserted into the reservoir or sump to sample from just below the fluid surface. When particle counting is a requirement a glass bottle is the preferred container. Clean sample bottles are necessary due to the sensitivity of particle counting to background effects.