30. Presentation provided by Dr Horn (TSI)

• Draft - DIS submitted for vote Oct 2013. Approved.
• FDIS to be submitted before 8 May, 2014.
• Publication mid 2014 (approx.).

31. The ISO standard focusses on how to do the calibration - a backbone document for metrology institutes - how to acquire the data, process the data etc …

32. ISO does not specify aerosol materials as this is application specific, nor will it provide information on how to generate the primary aerosols - on that a calibration aerosol must have very few multiply charged particles.

33. Method developed how to demonstrate linearity of CPC to much lower concentrations.

34. Discussion: EMRP will decide on candidate aerosols, potentially there will be a need for a round robin. The question is how to organise and co-ordinate the calibration aerosol discussion and testing requirements.