Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p25
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 25/150)
Character Range: 784066–787067

cover the PM number analyser and sampling line. The PM number analyser may alternatively be calibrated in parts (i.e. the pre-conditioning unit separately from the particle detector) provided that the PM number analyser and the sampling line together meet the requirements of Table 1. The signal measured from the detector shall be > 2 times the limit of detection (here defined as the zero level plus 3 standard deviations).

              A.2.2.5.3. Linearity requirements

              A.2.2.5.3.1. The linearity requirements shall be verified whenever damage is observed, as required by internal audit procedures or by the instrument manufacturer, at least once within the 12-month period leading up to a test.

              A.2.2.5.3.2. The PM number analyser, and the sampling line, shall meet the linearity requirements set out in Table 2.

              Table 2
              Linearity requirements of PM number analyser (and the sampling line)

Measurement parameter/instrument  min  (a1 - 1)+ a0  Slope a1   Standard error SEE  Coefficient of determination r2
PM number analyser                ≤ 5 per cent max      0.85-1.15  ≤ 10 per cent max   ≥ 0.950

A.2.2.5.3.3. The PM number analyser system and the sampling line, shall meet the linearity requirements of Table 2 using monodisperse or polydisperse soot-like particles. The particle size (mobility diameter or count median diameter) shall be larger than 45 nm. The reference instrument shall be an Electrometer or a Condensation Particle Counter (CPC) with d50 = 10 nm or lower, verified for linearity. Alternatively, the reference instrument may be a particle number system that complies with the requirements of paragraph 10. of Annex 4.
              A.2.2.5.3.4. In addition, the differences between the PM number analyser and the reference instrument at each of the points that are checked (except the zero point) shall be within 15 per cent of their mean value. At least 5 points equally distributed (plus the zero point) shall be checked. The maximum checked concentration shall be the maximum allowed concentration of the PM number analyser. If the PM number analyser is calibrated in parts, the linearity may be checked only for the detector, but the efficiencies of the other parts and the sampling line shall be taken into account in the slope calculation.

              A.2.2.5.4. Volatile removal efficiency

              A.2.2.5.4.1. The PM number analyser system shall achieve > 99 per cent removal of ≥ 30 nm tetracontane (CH3(CH2)38CH3) particles with an inlet concentration of ≥ 10,000 particles per cubic centimetre at the minimum dilution.

              A.2.2.5.4.2. Additionally, the PM number analyser system shall also achieve a > 99 per cent removal efficiency of polydisperse alcane (decane or higher) or emery oil with count median diameter > 50 nm and an inlet concentration of ≥ 5 × 106 particles per cubic centimetre at the minimum dilution (equivalent mass > 1 mg/m3).

              A.2.2.5.4.3.