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This Knowledge Base provides clear answers about compressed air monitoring and SUTO iTEC products. Topics include installation, choosing the right instruments, and solving common issues. We update this section regularly with new content. If you cannot find the information you need, please contact us.

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Why does the particle counter show unexpectedly high values?

High particle counter readings can originate from actual system contamination, damaged filters, or contaminated sampling lines and instrumentation.

A particle counter showing high values means either the compressed air actually contains more particles than expected or the sampling setup and instrument are introducing contamination.
Possible system causes:
  • The measuring point is upstream of the final filtration stage.
  • Filter elements are overloaded, damaged, bypassed, or installed incorrectly.
  • The system was recently opened, serviced, or disturbed, releasing residual contamination.
  • Separators or drains are not functioning correctly or are releasing carryover particles.
Sampling and instrumentation causes:
  • Sampling tubing, fittings, or quick couplings are contaminated and releasing particles.
  • The sampling line has not been purged long enough before measurement.
  • The instrument itself is contaminated or requires cleaning.
  • The instrument requires verification or calibration.
Diagnostic verification approach:
  • Install a zero-particle filter directly upstream of the instrument – this is the most effective way to isolate the source of high readings. If particle counts drop to near zero with the filter in line, the high readings are coming from the system. If counts remain high, the instrument or sampling system is contaminated.
  • Inspect the sampling tubing and connections – contamination can accumulate in sample lines, hose interiors, and quick couplings; use clean sampling accessories suitable for particle measurement and replace if needed.
  • Confirm the measuring point location – verify the measuring point is after the final treatment stage relevant to the target ISO 8573 class.
  • Inspect filters, separators, and drains – check for correct operation, service condition, and proper installation.
  • Purge the sampling line adequately – allow sufficient time to flush out particles from the sampling pathway before taking a measurement.
  • Compare with historical baseline data – use reference measurements or known clean air to verify instrument performance.
Tags: compressed air, particle counter
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