Government of Canada / Gouvernement du Canada
Symbol of the Government of Canada

Search

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

Regulations are current to 2022-06-20 and last amended on 2021-01-01. Previous Versions

PART 2Stationary Spark-ignition Engines (continued)

Determination of NOx Emission Intensity (continued)

Emissions Checks

Marginal note:When emissions check required for certain engines

 An emissions check to determine the concentration of NOx in the exhaust gas must be conducted

  • (a) on a lean-burn engine with a rated brake power of at least 375 kW,

    • (i) within 365 days after the assignment of a default emission value under subsection 66(1), and

    • (ii) within 365 days after the most recent performance test conducted on the engine under section 77 or 78 or the most recent emissions check conducted on the engine under this section; and

  • (b) on a rich-burn engine referred to in subparagraph 78(b)(i), within 90 days after the most recent performance test conducted on the engine under section 77 or 78 or the most recent emissions check conducted on the engine under this section.

Marginal note:Using electrochemical analyzer

  •  (1) An emissions check must be conducted by means of an electrochemical analyzer.

  • Marginal note:Electrochemical analyzers

    (2) The electrochemical analyzer must

    • (a) be capable of simultaneously measuring the concentrations, in an engine’s exhaust gas, of each of the following gases by means of an electrochemical cell for each of those gases:

      • (i) O2, CO and NO, for

        • (A) a rich-burn engine that is equipped with a three-way catalyst, and

        • (B) an engine whose NOx in the exhaust gas consists of at most 10% NO2, based on the results of the most recent performance test conducted on it, and

      • (ii) O2, CO, NO and NO2, in any other case;

    • (b) have a resolution, as specified by its manufacturer, that is at most

      • (i) 1 ppm, for CO, NO and, if applicable, NO2, and

      • (ii) 0.1%, for O2; and

    • (c) be equipped with a device that monitors the temperature of the NO electrochemical cell.

Marginal note:Calibration error checks and interference responses

 Before an electrochemical analyzer is used for the first time to conduct an emissions check on an engine,

  • (a) an initial sequence of calibration error checks must be conducted on the cells of the analyzer in accordance with section 83; and

  • (b) an initial determination of the CO and NO interference responses of the cells of the analyzer must be conducted in accordance with section 84 for each of the calibration error checks in the sequence.

Marginal note:Analyzer — operation and maintenance

  •  (1) An electrochemical analyzer must be operated and maintained in accordance with the manufacturer’s specifications, including the specifications on

    • (a) introducing gas into the analyzer at a constant flow rate within the range specified by the manufacturer; and

    • (b) rinsing the analyzer with fresh air for the period recommended by the manufacturer between each introduction of gas into the analyzer.

  • Marginal note:Analyzer — set-up

    (2) Before a calibration error check or an emissions check is conducted in a given location,

    • (a) the measurement system must be verified to have no leaks;

    • (b) if applicable, the measurement system must be verified to have sufficient scrubbing agent in good working order to conduct the check;

    • (c) after those verifications, the analyzer must be turned on at that location for the longer of

      • (i) 20 minutes, and

      • (ii) the period that is necessary for the temperature of the NO electrochemical cell to be within 2°C of ambient air temperature; and

    • (d) after the end of the applicable period described in paragraph (c), the analyzer must be zeroed at that location by

      • (i) using the zeroing function of the analyzer, or

      • (ii) turning it off and on.

  • Marginal note:Analyzer — measurement system for introduction of gas

    (3) The measurement system for the introduction of gas into the analyzer must

    • (a) remove condensation continuously from that gas by means of a chilled condenser or similar device; and

    • (b) be non-reactive with NO2.

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%.

Marginal note:Invalid emissions check — calibration and interference

 If a calibration error check on a cell of an analyzer does not meet the requirements of subsection 83(6) or a determination — based on the readings taken during a sequence of calibration error checks that includes that calibration error check — of the CO interference response made under subsection 84(2), or of the NO interference response made under subsection 84(3), is more than 5%,

  • (a) any emissions check that is conducted with the analyzer, since the most recent sequence of calibration error checks on the analyzer, is invalid; and

  • (b) no emissions check that is conducted with the analyzer is valid until

    • (i) a sequence of calibration error checks on its cells is conducted for which each calibration error check meets the requirements of subsection 83(6), and

    • (ii) a determination — based on the readings taken during that sequence — of at most 5% is made in accordance with subsections 84(2) and 84(3) of the CO interference response and of the NO interference response, respectively.

Marginal note:Emissions check — sampling ports

  •  (1) The location in the exhaust pipe of the sampling port and its traverse points — or the single traverse point — at which an emissions check is to be conducted must be

    • (a) the same as the location of the sampling port or the single traverse point that is used for the most recent performance test conducted, if that port or point continues to be available; and

    • (b) determined in accordance with section 71, in any other case.

  • Marginal note:Single point

    (2) A single traverse point at the centre of the exhaust pipe at the sampling port may be used to take samples instead of multiple traverse points.

 
Date modified: