Comparison of Three Particle Number Concentration Calibration Standards Through Calibration of a Single CPC in a Wide Particle Size Range

Figures & data

FIG. 1 Measurement setup used with the AIST primary NCS in CPC calibration.

FIG. 2 Measurement setups used with the SCAR in CPC calibration.

FIG. 3 Experimental setup used with the IAG in CPC calibration.

FIG. 4 Calibration results for the same CPC 3772 (TSI Inc., Shoreview, MN, USA) made with the three different number concentration standards. The abscissa is the mobility-equivalent particle diameter. Results with similar symbol are obtained with the same standard.

FIG. 5 Close view of the calibration results obtained with the three different number concentration standards together with the related expanded uncertainties (k = 2). The abscissa is the mobility-equivalent particle diameter.

TABLE 1 Typical values for the component uncertainties contributing to the overall standard uncertainty of the CPC detection efficiency calculated from the data in Figure 5. Results apply to following conditions: FCAE flow rate, 1 L min⁻¹; number concentration, 8500 and 3200 particles cm⁻³ for the SCAR and the primary NCS of AIST

	SCAR
	Setup I	Setup II	AIST
FCAE number concentration (Equation (13))
	0.004 64	0.004 64	0.003 94
	0.011 8	0.008 39	0.003 66
	0.012 7	0.009 58	0.005 38
CPC number concentration
	0.004 84	0.001 79	0.001 71
Detection efficiency (conf. a or b) (Equation (11))
	0.013 6	0.009 74	0.005 64
Bias between sampling ports
	0.006 89	0.003 86	0.000 44
Overall detection efficiency (Equation (10))
	0.010 2	0.007 15	0.004 00