Airmodus Condensation Particle Counters are designed to count individual aerosol particles accurately from very low to high concentrations. They are ideal for ambient air monitoring as well as aerosol research.

The A20 is a robust and reliable tool for aerosol particle measurements in all applications where precision and sensitivity is of the essence. It is a user-friendly tool for counting aerosol particles larger than 5 nm (by request A20 can be delivered with a cut-off between 5 – 10 nm, e.g. for ambient measurements 7 nm).

A versatile particle counter

The A20 can be used both as a stand-alone instrument for measuring the total particle number concentration, and as a counter in different kinds of aerosol measurement systems. It is easy to use and handle. All settings can be quickly adjusted from a handy touch screen, which also displays the current concentration reading and instrument diagnostics.

The A20 is also compatible with the Airmodus Particle Size Magnifier A10. Use the A10 when you want to study particles as small as 1 nm!

Benefits of the A20

– High statistics for low concentrations: the instrument is specially designed for precise particle counting and the sample flow is not diluted

– High accuracy for high concentrations:

up to 30 000#/cm3 in single particle counting mode, for higher

concentrations the Total Scattering Mode Correction is automatically applied

– In addition to the easy to use touch screen, adjusting the settings and data logging is easy. User-friendly

operation software is delivered with the instrument

– All connections optimized for easy access

Particle size range 5 nm – 2.5 µm

Dp50% = 5 nm* (on request 5 – 10 nm)

Concentration 0 – 100 000 #/cm3

Up to 30 000 #/cm3 in single particle counting mode with coincidence <10%; higher concentrations with Total Scattering Mode Correction

Aerosol sample flow Nominal flow 1 lpm, controlled with a critical orifice

Response time t90 < 3 s

False counts <0.001 #/cm3

Working fluid n-Butanol (>99.5%)

Operating temperatures

Saturator: 39oC Condenser: 15oC Optics:        40oC

Sample conditions

Pressure: 75 to 105 kPa

Relative humidity: 0 to 95% non-condensing (preferably <40%)**

Environmental conditions

Temperature: 15oC to 35oC Pressure: 75 to 105 kPa

Relative humidity: 0 to 95% non-condensing

Communication Analog in: BNC connector, 0 to 10 V (reading data of external sensor)  Analog out: BNC connector, 0 to 10 V, user-selectable function output (linear concentration, also DMA voltage control)

Pulse out: BNC connector

Serial: RS-232

Ethernet: RJ45

USB: type B connector

All communication based on ASCII character-encoding scheme.

Fittings External Vacuum: 1/4 in. stainless steel tube

Inlet: 1/4 in. stainless steel tube

Software Airmodus A2X software for online data acquisition (for Microsoft Windows)

External vacuum requirement

100 – 400 mbar pressure at NTP (or <40% of inlet pressure)

Power requirements 100 – 240 VAC

max. 320 W

universal AC input/full range

Dimensions and weight

260x230x400 (height x width x depth in mm)

10.5 kg

Shipping conditions Temperature: 0 – 40oC

Relative humidity: <95% non-condensing

The instrument should be shipped in upright position and should be protected against tremor and blows.

*) Cut-off size in mobility equivalent diameter. See calibration certificate. On request the cut-off can be calibrated to be in the range 5 – 10 nm.

**) With high relative humidity, an aerosol drier should be used to prevent excess water condensation inside the instrument. Microsoft and Windows are registered trademarks of Microsoft Corporation.