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First Run

  1. Remove the inlet and outlet covers. When running the NAIS for testing indoors, attach the included inlet mesh to prevent dust and fibres from contaminating the analyzer.
  2. Power on the instrument and start the measurement software. The firmware startup typically takes 30 - 60 seconds. The software will automatically retry connecting until the instrument is ready, then activate the blowers and begin measurements.
  3. Check the diagnostics in the measurement software to verify that the blowers stabilize and that all airflows are unobstructed.
  4. Allow a minimum warm-up period of 5 minutes and at least three complete measurement cycles. During this initial period, the software may display diagnostic warnings, and the data collected will not be accurate. The central electrode voltages will stabilize within 15 to 30 minutes.
  5. After the warm-up period, check the diagnostics for any remaining warnings. Persistent warnings may indicate a problem that needs attention.

When operating in particles mode for the first time after software installation, the post-filter voltages may not be optimal. The post-filter prevents charger ions from entering the mobility analyzer and saturating the electrometers, which would cause high noise due to frequent resets. The post-filter voltages may initially either allow too many charger ions into the analyzer or filter out too many "normal" ions. The adjustment algorithm typically requires 30 minutes to several hours to settle on a stable value (refer to Post-filter for details). Until settled, you may observe higher background noise or inaccurate measurements.

If you suspect the instrument is not operating correctly, collect at least one hour of data and send the block average files to Airel Support at support@airel.ee. If requested, send the full data files (records, log, and spectra) as well.

For further assistance, Airel Support can perform remote diagnostics by connecting to the measurement computer via remote access software (e.g., RustDesk).

For experienced users: Consult Diagnostic Checklist for a comprehensive list of conditions to verify correct instrument operation.