National Physical Laboratory

Condensation Particle Counter Calibration

Airborne nanoparticle number concentration detectors such as Condensation Particle Counters (CPCs) are a key part of many measurements for vehicle emissions, ambient air quality, occupational exposure and other applications.

Nanoparticle monitoring

The NPL airborne nanoparticle metrology laboratory maintains a UKAS-accredited facility to ISO 17025, for the calibration of such instruments. This is conducted through comparison with our standard aerosol electrometer that has been calibrated against NPL's electrical standards. Flow rates can also be calibrated against NPL flow standards. In addition, NPL is actively involved in international comparison campaigns for these measurements.

NPL can offer a flexible calibration to meet the needs of different applications, including vehicle emissions (i.e. PMP requirements) and air quality measurements.

In addition, NPL also offers basic servicing of Condensation Particle Counters. This is built on the expertise we have gained by running and maintaining the instruments operated within the UK Particle Monitoring Network.

We recommend calibration on arrival, servicing and optimisation, and post servicing calibration, to ensure that your instruments are kept in good working order with the best possible traceability history.

Technical Specifications

  • Nominal concentration range for the calibration service is between 1,000 and 200,000 particles per cm3 (
  • Accredited for particles with a sphere equivalent aerodynamic diameter < 100 nm
  • The relative expanded (k=2) uncertainty of the calibration is 7%

Download our flyer for more information on our condensation particle counter calibration services Adobe Acrobat PDF file


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Customer enquiry line: 020 8943 8681

Last Updated: 29 Jun 2015
Created: 31 Oct 2013


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