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Multi-Sector Air Pollutants Regulations (SOR/2016-151)

Regulations are current to 2020-10-21 and last amended on 2020-09-21. Previous Versions

PART 2Stationary Spark-ignition Engines (continued)

Determination of NOx Emission Intensity (continued)

Emissions Checks (continued)

Marginal note:Sequence of calibration error checks

  •  (1) A sequence of calibration error checks consists of two calibration error checks on each of the electrochemical cells of an analyzer, one involving the introduction of a zero gas and the other involving the introduction of a span gas.

  • Marginal note:Calibration error checks

    (2) A calibration error check on an electrochemical cell of an analyzer is conducted by introducing into the analyzer, at a constant flow rate, a calibration gas — namely, a zero gas or a span gas — for each of the gases referred to in subsection (3) to which that cell is designed to respond in order to determine the difference between

    • (a) the concentration of that gas in that calibration gas, as indicated by the reading of that cell’s response to it taken after the stabilization period for the calibration error check for that cell, and

    • (b) the certified concentration of that gas in that calibration gas.

  • Marginal note:Calibration gases

    (3) The zero gas and the span gas for the following gases to which a cell is designed to respond are

    • (a) for O2,

      • (i) a zero gas that consists of

        • (A) O2 in nitrogen, with a certified concentration of O2 of less than 0.25% of the concentration of O2 in its corresponding span gas,

        • (B) CO in nitrogen, or in air, with a certified concentration of O2 of less than 0.05%, or

        • (C) NO in nitrogen, with a certified concentration of O2 of less than 0.05%, and

      • (ii) a span gas that consists of

        • (A) ambient air in a well-ventilated area, with a presumed certified concentration of 20.9% O2, or

        • (B) O2 in nitrogen that has a certified concentration of O2 that is

          • (I) within the measuring range, specified by the analyzer’s manufacturer, for the O2 cell, and

          • (II) at least 5% and at most 20.9%;

    • (b) for CO,

      • (i) a zero gas that consists of

        • (A) ambient air in a well-ventilated area, with a presumed certified concentration of 0 ppm CO, or

        • (B) CO in nitrogen, or in air, with a certified concentration of CO of less than 0.25% of the concentration of CO in its corresponding span gas, and

      • (ii) a span gas that consists of CO in nitrogen, or in air, with a certified concentration of CO that is

        • (A) within the measuring range, specified by the analyzer’s manufacturer, for the CO cell, and

        • (B) at least 200 ppm and at most 400 ppm;

    • (c) for NO,

      • (i) a zero gas that consists of

        • (A) ambient air in a well-ventilated area, with a presumed certified concentration of 0 ppm NO, or

        • (B) NO in nitrogen, with a certified concentration of NO of less than 0.25% of the concentration of NO in its corresponding span gas, and

      • (ii) a span gas that consists of NO in nitrogen, with a certified concentration of NO that is

        • (A) within the measuring range, specified by the analyzer’s manufacturer, for the NO cell, and

        • (B) at least 100 ppm and at most 200 ppm; and

    • (d) for NO2,

      • (i) a zero gas that consists of

        • (A) ambient air in a well-ventilated area, with a presumed certified concentration of 0 ppm NO2, or

        • (B) NO2 in air with a certified concentration of NO2 of less than 0.25% of the concentration of NO2 in its corresponding span gas, and

      • (ii) a span gas that consists of NO2 in air, with a certified concentration of NO2 that is

        • (A) within the measuring range, specified by the analyzer’s manufacturer, for the NO2 cell, and

        • (B) at least 50 ppm and at most 100 ppm.

  • Marginal note:Certified concentration

    (4) A concentration of O2, CO, NO or NO2 in a calibration gas is certified if the manufacturer of the gas certifies that

    • (a) the concentration of that gas in the calibration gas is accurate within ± 2%; and

    • (b) the calibration gas was prepared and analyzed

      • (i) in accordance with section 2 of method entitled EPA Traceability Protocol for Assay and Certification of Gaseous Calibration Standards, published in May 2012 and bearing the designation EPA/600/R-12/531, or

      • (ii) by means of a process for measuring that concentration and for verifying its accuracy in accordance with specifications and standards of the National Institute of Standards and Technology of the United States.

  • Marginal note:Stabilization periods and records

    (5) The stabilization period for a sequence of calibration error checks on an analyzer is the longest period among the periods required for each electrochemical cell to have a stable response, following the introduction of a span gas into the analyzer, to the gas to which the cell is designed to respond. The duration of each of those periods must be recorded.

  • Marginal note:Calibration error

    (6) The calibration error — for each calibration error check involving the introduction of the zero gas or of the span gas — must be at most

    • (a) for O2, 0.5%; and

    • (b) for CO, NO or NO2, the greater of

      • (i) 5% of the certified concentration of that gas in the span gas, and

      • (ii) 10 ppm.

Marginal note:Reading for CO and NO interference responses

  •  (1) When a reading of an electrochemical cell’s response to a span gas for NO or NO2 is taken under subsection 83(1), a reading must also be taken — for the purpose of determining the CO and NO interference responses — of the response of the following other cells of the analyzer to that span gas:

    • (a) for a span gas for NO, the CO cell; and

    • (b) for a span gas for NO2, the CO and NO cells.

  • Marginal note:CO interference response

    (2) The CO interference response — namely, the response of the CO cell to the presence of NO and NO2 in the introduced span gas — is the percentage determined by the formula

    [(RCO−NO/CNOG × CNOS/CCOS) + (RCO−NO2/CNO2G × CNO2S/CCOS)] × 100

    where

    RCO−NO
    is the CO response to span gas for NO, expressed in ppm of CO;
    CNOG
    is the certified concentration of NO in the span gas for NO, expressed in ppm of NO;
    CNOS
    is the concentration of NO in the exhaust gas of the engine, as determined in accordance with section 89 for the most recent emissions check that was conducted by means of the analyzer referred to in subsection (1), expressed in ppm of NO;
    CCOS
    is the concentration of CO in the exhaust gas of the engine, as determined in accordance with section 89 for that most recent emissions check, expressed in ppm of CO;
    RCO−NO2
    is the CO response to span gas for NO2, expressed in ppm of CO;
    CNO2G
    is the certified concentration of NO2 in the span gas for NO2, expressed in ppm of NO2; and
    CNO2S
    is the concentration of NO2 in the exhaust gas of the engine, as determined in accordance with section 89 for that most recent emissions check, expressed in ppm of NO2.
  • Marginal note:NO interference response

    (3) The NO interference response — namely, the response of the NO cell to the presence of NO2 in the introduced span gas — is the percentage determined by the formula

    RNO−NO2/CNO2G × CNO2S/CNOxS × 100

    where

    RNO−NO2
    is the NO response to span gas for NO2, expressed in ppm of NO;
    CNO2G
    is the certified concentration of NO2 in the span gas for NO2, expressed in ppm of NO2;
    CNO2S
    is the concentration of NO2 in the exhaust gas of the engine, as determined in accordance with section 89 for the most recent emissions check that was conducted by means of the analyzer referred to in subsection (1), expressed in ppm of NO2; and
    CNOxS
    is the concentration of NOx in the exhaust gas of the engine, as determined in accordance with section 89 for that most recent emissions check, expressed in ppm of NOx.
  • Marginal note:No prior emissions check

    (4) If there is no prior emissions check conducted by means of the analyzer referred to in subsection (1),

    • (a) the value of CNOS, CCOS and CNO2S referred to in subsection (2) or (3) is the certified concentration of NO, CO and NO2, respectively, in the span gas for that gas, expressed in ppm of that gas; and

    • (b) the value of CNOxS referred to in subsection (3) is the total of the certified concentrations of NO and NO2 in the span gas for NO and NO2, respectively, expressed in ppm of NOx.

  • Marginal note:Interference response ≤ 5%

    (5) The CO interference response and the NO interference response must each be at most 5%.

 
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