Document ID: chunk:federal_register_of_legislation:F2012C00283:reg:21:p26
Version: federal_register_of_legislation:F2012C00283
Segment Type: reg
Provision Reference: reg 21 (pt 26/39)
Character Range: 328630–331583

 150 °C and ≤ 400 °C and dilutes by a factor of at least 10;
              1.3.3.3. Control heated stages to constant nominal operating temperatures, within the range specified in paragraph 1.3.3.2., to a tolerance of ±10 °C. Provide an indication of whether or not heated stages are at their correct operating temperatures.
              1.3.3.4. Achieve a particle concentration reduction factor (fr(di)), as defined in paragraph 2.2.2., 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;
              1.3.3.5. Also achieve > 99.0 per cent vaporisation of 30 nm tetracontane (CH3(CH2)38CH3) particles, with an inlet concentration of ≥ 10,000 cm-3, by means of heating and reduction of partial pressures of the tetracontane.
              1.3.4. The PNC shall:
              1.3.4.1. Operate under full flow operating conditions;
              1.3.4.2. Have a counting accuracy of ±10 per cent across the range 1 cm-3 to the upper threshold of the single particle count mode of the PNC against a traceable standard. At concentrations below 100 cm-3 measurements averaged over extended sampling periods may be required to demonstrate the accuracy of the PNC with a high degree of statistical confidence;
              1.3.4.3. Have a readability of at least 0.1 particles cm-3 at concentrations below 100 cm-3;
              1.3.4.4. Have a linear response to particle concentrations over the full measurement range in single particle count mode;
              1.3.4.5. Have a data reporting frequency equal to or greater than 0.5 Hz;
              1.3.4.6. Have a T90 response time over the measured concentration range of less than 5 s;

              1.3.4.7. Incorporate a coincidence correction function up to a maximum 10 per cent correction, and may make use of an internal calibration factor as determined in paragraph 2.1.3., but shall not make use of any other algorithm to correct for or define the counting efficiency;
              1.3.4.8. Have counting efficiencies at particle sizes of 23 nm (±1 nm) and 41 nm (±1 nm) electrical mobility diameter of 50 per cent (±12 per cent) and > 90 per cent respectively. These counting efficiencies may be achieved by internal (for example; control of instrument design) or external (for example; size pre-classification) means;
              1.3.4.9. If the PNC makes use of a working liquid, it shall be replaced at the frequency specified by the instrument manufacturer.
              1.3.5. Where they are not held at a known constant level at the point at which PNC flow rate is controlled, the pressure and/or temperature at inlet to the PNC must be measured and reported for the purposes of correcting particle concentration measurements to standard conditions.
              1.3.6. The