BS ISO 27891:2015
$215.11
Aerosol particle number concentration. Calibration of condensation particle counters
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 132 |
This International Standard describes methods to determine the detection efficiency of condensation particle counters (CPCs) at particle number concentrations ranging between 1 cm-3 and 105 cm-3, together with the associated measurement uncertainty. In general, the detection efficiency will depend on the particle number concentration, the particle size, and the particle composition. The particle sizes covered by the methods described in this International Standard range from approximately 5 nm to 1 000 nm.
The methods can therefore be used both to determine a CPC calibration factor to be applied across the range of larger particle sizes where the detection efficiency is relatively constant (the plateau efficiency), and to characterize the drop in CPC detection efficiency at small particle sizes, near the lower detection limit. These parameters are described in more detail in Annex A.
The methods are suitable for CPCs whose inlet flows are between approximately 0,1 l/min and 5 l/min.
This International Standard describes a method for estimating the uncertainty of a CPC calibration performed according to this International Standard.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | Foreword |
| 8 | Introduction |
| 11 | 1 Scope 2 Normative references 3 Terms and definitions |
| 15 | 4 Symbols |
| 18 | 5 Calibration using reference instruments — General principles 5.1 General principles |
| 19 | 5.2 Objectives for the calibration aerosol 5.3 Setup overview |
| 20 | 5.4 Components and their requirements 5.4.1 Primary aerosol source |
| 21 | 5.4.2 Charge conditioner 5.4.3 DEMC 5.4.4 Make-up or bleed air |
| 22 | 5.4.5 Mixing device, flow splitter and connection tubing 5.4.6 Reference instrument: FCAE or CPC |
| 24 | 5.4.7 Other tools 5.5 Differences between FCAE and CPC as a reference instrument |
| 25 | 6 Calibration using an FCAE as reference instrument 6.1 Overview of the setup and calibration procedure |
| 28 | 6.2 Preparation 6.2.1 General preparation 6.2.2 Primary aerosol 6.2.3 Other equipment 6.2.4 DEMC |
| 29 | 6.2.5 FCAE |
| 30 | 6.2.6 Test CPC |
| 31 | 6.2.7 Check of the complete setup |
| 33 | 6.3 Calibration procedure of detection efficiency 6.3.1 General 6.3.2 DEMC diameter adjustment 6.3.3 Primary aerosol adjustment |
| 34 | 6.3.4 Splitter bias β measurement 6.3.5 Test CPC efficiency measurement |
| 36 | 6.3.6 Measurement of different particle concentrations 6.3.7 Measurement of different sizes 6.3.8 Repetition of first measurement point 6.3.9 Preparation of the calibration certificate 6.4 Measurement uncertainty 6.4.1 General |
| 37 | 6.4.2 Particle size 6.4.3 Detection efficiency |
| 38 | 6.4.4 Particle number concentration 7 Calibration using a CPC as reference instrument 7.1 Overview of the setup and calibration procedure |
| 41 | 7.2 Preparation 7.2.1 General preparation 7.2.2 Primary aerosol 7.2.3 Other equipment 7.2.4 DEMC |
| 42 | 7.2.5 Reference CPC |
| 43 | 7.2.6 Test CPC 7.2.7 Check of the complete setup |
| 45 | 7.3 Calibration procedure of detection efficiency 7.3.1 General 7.3.2 DEMC diameter adjustment |
| 46 | 7.3.3 Primary aerosol adjustment 7.3.4 Splitter bias β measurement |
| 47 | 7.3.5 Test CPC efficiency measurement |
| 48 | 7.3.6 Measurement of different particle concentrations 7.3.7 Measurement of different sizes 7.3.8 Repetition of first measurement point 7.3.9 Preparation of the calibration certificate 7.4 Measurement uncertainty 7.4.1 General |
| 49 | 7.4.2 Particle size 7.4.3 Detection efficiency |
| 50 | 7.4.4 Particle number concentration 8 Reporting of results |
| 52 | Annex A (informative) CPC performance characteristics |
| 61 | Annex B (informative) Effect of particle surface properties on the CPC detection efficiency |
| 63 | Annex C (informative) Example calibration certificates |
| 72 | Annex D (normative) Calculation of the CPC detection efficiency |
| 83 | Annex E (informative) Traceability diagram |
| 85 | Annex F (informative) Diluters |
| 88 | Annex G (normative) Evaluation of the concentration bias correction factor between the inlets of the reference instrument and test CPC |
| 93 | Annex H (informative) Extension of calibration range to lower concentrations |
| 100 | Annex I (informative) Example of a detection efficiency measurement |
| 116 | Annex J (normative) Volumetric flow rate calibration |
| 118 | Annex K (normative) Testing the charge conditioner and the DEMC at maximum particle number concentration |
| 119 | Annex L (informative) A recommended data recording method when using a reference FCAE |
| 121 | Annex M (informative) Uncertainty of detection efficiency due to particle size uncertainty |
| 123 | Annex N (informative) Application of calibration results |
| 126 | Bibliography |
