NPS500 Comparative Measurements at NPL

A comparison performed at the UK’s National Physical Laboratory reveals a good agreement between the NPS500, the first truly portable and user-friendly nanoparticle spectrometer (SMPS type), and a reference SMPS instrument.

NPL is a leading scientific institution with a worldwide reputation for calibrating and performing comparisons of various instruments. The laboratory has access to an extensive range of nanoparticle generators and particle characterisation instruments. The aim of these measurements was to compare the NPS500 nanoparticle spectrometer with reference instruments from a leading American manufacturer.

As a fully portable nanoparticle spectrometer, the NPS500 creates new opportunities for nanoparticle characterisation in environments such as the work place and outdoors. The NPS500 takes nanoparticle characterisation out of the laboratory and into places where it is most needed.

Figure 1: Comparison of sucrose aerosol particle number size distributions (dN/dLogD in cm-3) obtained at an NPL laboratory using an NPS500 (blue) and a reference instrument (green).

The sucrose aerosol was generated with an Electro-spray aerosol generator and the particle size distributions measured simultaneously using the NPS500 and a reference instrument. The comparison shows very good agreement between the two instruments. A soot aerosol particle size distribution was also recorded with NPS500 and a reference instrument and is shown in figure 2. The distributions measured by both instruments agree within the range of uncertainty that is to be expected when measuring size distributions (±20% for dN/dLogD).

Figure 3 shows another example of good agreement between the NPS500 and a reference instrument for a sucrose aerosol.

The distributions shown in these figures represent typical comparisons between an NPS500 and a reference instrument. Therefore, the NPS500 is the first nanoparticle spectrometer to enable the accurate measurement of nanoparticle size distributions in a portable format.

Figure 2: Soot aerosol particle number size distributions (dN/dLogD in cm-3) obtained at an NPL laboratory using an NPS500 (blue) and a reference instrument (green).

 

Figure 3: Sucrose aerosol particle number size distributions (dN/dLogD in cm-3) obtained at a NPL laboratory with an NPS500 (blue) and a reference instrument (green).