Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:9:p26
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 9 (pt 26/71)
Character Range: 282021–285299

medium to record and output the required smoke values specified in Annex III, Appendix 1, Section 6.3.

5.2.                            Specific requirements

5.2.1.                        Linearity

              The linearity shall be within ± 2 % opacity.

5.2.2.                        Zero drift

              The zero drift during a one hour period shall not exceed ± 1 % opacity.

5.2.3.                        Opacimeter display and range

              For display in opacity, the range shall be 0-100 % opacity, and the readability 0,1 % opacity. For display in light absorption coefficient, the range shall be 0-30 m−1 light absorption coefficient, and the readability 0,01 m−1 light absorption coefficient.

5.2.4.                        Instrument response time

              The physical response time of the opacimeter shall not exceed 0,2 s. The physical response time is the difference between the times when the output of a rapid response receiver reaches 10 and 90 % of the full deviation when the opacity of the gas being measured is changed in less than 0,1 s.
              The electrical response time of the opacimeter shall not exceed 0,05 s. The electrical response time is the difference between the times when the opacimeter output reaches 10 and 90 % of the full scale when the  light source is interrupted or completely extinguished in less than 0,01 s.

5.2.5.                        Neutral density filters

              Any neutral density filter used in conjunction with opacimeter calibration, linearity measurements, or setting span shall have its value known to within 1,0 % opacity. The filter's nominal value must be checked for accuracy at least yearly using a reference traceable to a national or international standard.

              Neutral density filters are precision devices and can easily be damaged during use. Handling should be minimised and, when required, should be done with care to avoid scratching or soiling of the filter.

Appendix 5

        CALIBRATION PROCEDURE

               1. CALIBRATION OF THE ANALYTICAL INSTRUMENTS

                   1.                             Introduction

              Each analyser shall be calibrated as often as necessary to fulfil the accuracy requirements of this Directive. The calibration method that shall be used is described in this section for the analysers indicated in Annex III, Appendix 4, Section 3 and Annex V, Section 1.

1.2.                            Calibration gases

              The shelf life of all calibration gases must be respected.

              The expiration date of the calibration gases stated by the manufacturer shall be recorded.

1.2.1.                        Pure gases

              The required purity of the gases is defined by the contamination limits given below. The following gases must be available for operation:

              Purified nitrogen

                (Contamination ≤ 1 ppm C1, ≤ 1 ppm CO, ≤ 400 ppm CO2, ≤ 0,1 ppm NO)

              Purified oxygen

                (Purity > 99,5 % vol O2)

              Hydrogen-helium mixture

                (40 ± 2 % hydrogen, balance helium) (Contamination ≤ 1 ppm C1, ≤ 400 ppm CO2)
              Purified synthetic air

                (Contamination ≤ 1 ppm C1, ≤ 1 ppm