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

Marginal note:Sequence of calibration error checks

• 83 (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

• 84 (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

  [(R_CO−NO/C_NOG × C_NOS/C_COS) + (R_CO−NO2/C_NO2G × C_NO2S/C_COS)] × 100

  where

  R_CO−NO

  is the CO response to span gas for NO, expressed in ppm of CO;

  C_NOG

  is the certified concentration of NO in the span gas for NO, expressed in ppm of NO;

  C_NOS

  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;

  C_COS

  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;

  R_CO−NO2

  is the CO response to span gas for NO₂, expressed in ppm of CO;

  C_NO2G

  is the certified concentration of NO₂ in the span gas for NO₂, expressed in ppm of NO₂; and

  C_NO2S

  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

  R_NO−NO2/C_NO2G × C_NO2S/C_NOxS × 100

  where

  R_NO−NO2

  is the NO response to span gas for NO₂, expressed in ppm of NO;

  C_NO2G

  is the certified concentration of NO₂ in the span gas for NO₂, expressed in ppm of NO₂;

  C_NO2S

  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

  C_NOxS

  is the concentration of NO_x in the exhaust gas of the engine, as determined in accordance with section 89 for that most recent emissions check, expressed in ppm of NO_x.

• 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 C_NOS, C_COS and C_NO2S 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 C_NOxS 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 NO_x.

• Marginal note:Interference response ≤ 5%

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