NAIS-7 Manual

Operation and Service Manual for Airel NAIS generation 7 instruments.

Revision 2 — 2026-02-19

Overview

The Neutral cluster and Air Ion Spectrometer (NAIS) is a parallel multichannel aerosol spectrometer for measuring the mobility distribution of ions (from 3.2 to 0.0014 cm²/V/s, from 0.8 to 40 nm size equivalent) and size distribution of aerosol particles (from 2 to 40 nm) with a maximum time resolution of 1 second.

The NAIS is based on the principle of parallel differential mobility analysis. The instrument is easy to deploy, operate and maintain. It can measure for long periods without requiring human attention and works well in a wide range of environmental conditions.

Revision History

Revision 2 — 2026-02-19: Corrected charger/discharger control voltage logic in cleaning procedures. Updated diagnostic checklist: discharger current, flow rate feedback control range, sheath flow rate description, charger current signs, sheath air filter checks.
Revision 1 — 2026-02-19: Initial publication.