Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:1800:p11
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 1800 (pt 11/12)
Character Range: 531407–534319

wall temperature;
(c) May be insulated.
 FH Filter holder
 The filter holder:
(a) Shall have a 12.5° (from center) divergent cone angle to transition from the transfer line diameter to the exposed diameter of the filter face;
(b) May be heated to no greater than 325 K (52 °C) wall temperature;
(c) May be insulated.
 Multiple filter changers (auto changers) are acceptable, as long as there is no interaction between sampling filters.
 PTFE membrane filters shall be installed in a specific cassette within the filter holder.
 An inertial pre-classifier with a 50 per cent cut point between 2.5 µm and 10 µm shall be installed immediately upstream of the filter holder, if an open tube sampling probe facing upstream is used.
P Sampling pump
FC2 Flow controller
 A flow controller shall be used for controlling the particulate sample flow rate.
FM3 Flow measurement device
 Gas meter or flow instrumentation to determine the particulate sample flow through the particulate filter. It may be installed upstream or downstream of the sampling pump P.
FM4 Flow measurement device
 Gas meter or flow instrumentation to determine the secondary diluent flow through the particulate filter.
BV Ball valve (optional)
 The ball valve shall have an inside diameter not less than the inside diameter of the particulate transfer tube PTT, and a switching time of less than 0.5 second.

Annex 4 ‑ Appendix 3 Statistics
A.3.1. Mean value and standard deviation
 The arithmetic mean value shall be calculated as follows:
                (102)
 The standard deviation shall be calculated as follows:
                (103)
              A.3.2. Regression analysis

        The slope of the regression shall be calculated as follows:

  (104)

        The y intercept of the regression shall be calculated as follows:

  (105)

        The standard error of estimate (SEE) shall be calculated as follows:

            (106)

              The coefficient of determination shall be calculated as follows:

                             (107)
A.3.3. Determination of system equivalency
 The determination of system equivalency according to paragraph 5.1.1. of this annex shall be based on a seven sample pair (or larger) correlation study between the candidate system and one of the accepted reference systems of this annex using the appropriate test cycle(s). The equivalency criteria to be applied shall be the F-test and the two-sided Student t-test.
 This statistical method examines the hypothesis that the sample standard deviation and sample mean value for an emission measured with the candidate system do not differ from the sample standard deviation and sample mean value for that emission measured with the reference system. The hypothesis shall be tested on the basis of a 10 per cent significance level of the F and t values. The critical F and t values for seven to ten sample pairs are given in Table 9. If the F and