It is typically recommended to measure air purity and quality at the following points in a compressed air system:
  • At the compressor outlet, to ensure that the compressed air being produced is free of contaminants such as oil, water, and particles.
  • At the point of use, to ensure that the compressed air being consumed by equipment or processes is of the appropriate quality for their intended use.
  • At the compressor inlet, to ensure that the ambient air being drawn in by the compressor is not contaminated and does not contain harmful particles or gases that could damage the compressor or reduce the quality of the compressed air.
  • At the point of storage, to ensure that the compressed air being stored in receivers or tanks is not contaminated by water, oil, or other impurities.
  • At the point of distribution, to ensure that the compressed air being distributed to different parts of the system is not contaminated by leaks, corrosion, or other issues.
  • It is also good practice to have a monitoring system in place to continuously measure and record the dew point, oil content, particle count, and other parameters that affect the purity and quality of the compressed air.