Standards Development

Scope

This document provides guidance for the use of charge conditioners for aerosol particles, especially for particle characterization and for the generation of calibration and test aerosols. It provides a methodology to specify the performance of charge conditioners and for adequate quality control with respect to their application in particle size and concentration measurement with differential mobility analysing systems (DMAS) and in particle size classification with differential electrical mobility classifiers (DEMC). For these applications, this document covers particle charge conditioning for particle sizes ranging from approximately 1 nm to 1 μm and for particle number concentrations at the inlet of the charge conditioner up to approximately 107 cm-3. This document does not address specific charge conditioner designs or other applications besides those mentioned above. Radiation safety for charge conditioners with radioactive sources or x-ray tubes is not covered by this document, since regional, national and international regulations and laws apply.

Purpose

Charge conditioning is an important component of electrical mobility and number concentration analyses for aerosol particles, which are used in various applications such as regulations in automotive particle emission tests, testing of particulate air filters, monitoring of particles in cleanroom and workplace air, etc. Performance of charge conditioners in such applications critically affects the accuracy of testing and monitoring results. Therefore, adequate quality control of charge conditioners by a well-founded and robust standard is needed, as described in the business plan of ISO/TC 24. Despite the need of a standard for charge conditioners, only a minimal standardization had been achieved so far, as part of an existing standard (ISO 15900). The proposed new work will develop a standard that is dedicated to charge conditioners, is consistent with the existing standards, and contains testing and characterizing techniques that are proved useful.

Consider the following: Is there a verified market need for the proposal? What problem does this standard solve? What value will the document bring to end-users? See Annex C of the ISO/IEC Directives part 1 for more information. See the following guidance on justification statements on ISO Connect: https://connect.iso.org/pages/viewpage.action?pageId=27590861