Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p57
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 57/108)
Character Range: 1044754–1048098

mobility diameter;
                  (g) Achieve a particle concentration reduction factor fr(di) for particles of 30 nm and 50 nm electrical mobility diameters that is no more than 30 per cent and 20 per cent respectively higher, and no more than 5 per cent lower than that for particles of 100 nm electrical mobility diameter for the VPR as a whole;
                  The particle concentration reduction factor at each particle size fr(di) shall be calculated using the following equation:
              where:
                         Nin(di) is the upstream particle number concentration for particles of diameter ;
                         Nout(di) is the downstream particle number concentration for particles of diameter di;
                         di is the particle electrical mobility diameter (30, 50 or 100 nm).
              Nin(di) and Nout(di) shall be corrected to the same conditions.
                  The arithmetic average particle concentration reduction factor at a given dilution setting shall be calculated using the following equation:
                  It is recommended that the VPR is calibrated and validated as a complete unit;
                  (h) Be designed according to good engineering practice to ensure particle concentration reduction factors are stable across a test;
                  (i) Achieve more than 99.0 per cent vaporization of 30 nm tetracontane (CH3(CH2)38CH3) particles, with an inlet concentration of ≥ 10,000 per cm³, by means of heating and reduction of partial pressures of the tetracontane.
              4.3.1.3.3.1.  The solid particle penetration Pr(di) at a particle size, di, shall be calculated using the following equation:
              Where
                     Nin(di)  is the upstream particle number concentration for particles of diameter ;
                     Nout(di) is the downstream particle number concentration for particles of diameter ;
                     di is the particle electrical mobility diameter
                     DF is the dilution factor between measurement positions of Nin(di) and Nout(di) determined either with trace gases, or flow measurements.
              4.3.1.3.4. The PNC shall:
              (a) Operate under full flow operating conditions;
                  (b) Have a counting accuracy of ±10 per cent across the range 1 per cm³ to the upper threshold of the single particle count mode of the PNC against a suitable traceable standard. At concentrations below 100 per cm³, measurements averaged over extended sampling periods may be required to demonstrate the accuracy of the PNC with a high degree of statistical confidence;
                  (c) Have a resolution of at least 0.1 particles per cm³ at concentrations below 100 per cm³;
                  (d) Operate under single counting mode only and have a linear response to particle number concentrations within the instrument's specified measurement range;
                  (e) Have a data reporting frequency equal to or greater than a frequency of 0.5 Hz;
                  (f) Have a t90 response time over the measured concentration range of less than 5 seconds;
                  (g) Introduce a correction with a calibration factor as determined in paragraph 5.7.1.3. of this annex;
                  (h) Have counting efficiencies at the different particle sizes as