MAS‑100 NT® EX

Volume and mass flow measurement in potentially explosive environments

The MAS‑100 NT® Ex is the explosion-proof model of the world’s best-selling air sampler, designed to monitor air microbiology in cleanrooms and hygienically ultra-sensitive areas with increased risk of explosion. Its high recovery rate is based on the Andersen impaction principle. An integrated airflow sensor compensates for differences in pressure and temperature in the environment. In combination with the DA-100 NT anemometer, the MAS‑100 NT® Ex features an automatic calibration function – for precise, independent airflow testing. The instrument also allows for the use of standard Petri dishes and special plates and is exceptionally easy to use.

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  • Explosion-proof in accordance with EU Directive 2014/34/EU (ATEX)
  • Integrated mass flow sensor with temperature and pressure compensation
  • Fully validated system, compliant with all current standards
  • Sophisticated instrument geometry, vertical airflow and isokinetic sampling speed prevent turbulence in the laminar airflow
  • Automatic calibration function
  • Operation with standard Petri dishes and contact plates
  • The SQS cycle enables division of the total volume into sub-volumes as well as measurement over a longer period of time
  • The integration of high-quality, particle-free components eliminates the need for HEPA filters
  • Rotatable sampling head for horizontal sampling


  • Airflow 100 standard litres per minute
  • Airflow reproducibility ±2.5%
  • D50 value 1.1 µm
  • Rechargeable battery, autonomy approx. 5.5 hours
  • Housing made from anodised aluminium
  • Interchangeable, autoclavable sampling head
  • Programmable start delay
  • Can be used with 300 × 0.6 and 400 × 0.7 perforated lids
  • Height 27 cm, diameter 11 cm (17 cm with handle), weight approx. 2.4 kg with sampling head


  • Dialogue-based menu operation
  • Five pre-programmed volumes, or individually adjustable between 1 and 2,000 litres
  • Computer communication, including software
  • Operation can be locked via computer software
  • Individual, process-controlled methods
  • Real-time clock with date and calibration reminder