Summary of required calibration and verifications.

The following table summarizes the required and recommended calibrations and verifications described in this subpart and indicates when these have to be performed: Table 1 of § 1065.303—Summary of Required Calibration and Verifications Type of calibration or verification Minimum frequency a § 1065.305: Accuracy, repeatability and noise Accuracy: Not required, but recommended for initial installation. Repeatability: Not required, but recommended for initial installation. Noise: Not required, but recommended for initial installation. § 1065.307: Linearity verification Speed: Upon initial installation, within 370 days before testing and after major maintenance. Torque: Upon initial installation, within 370 days before testing and after major maintenance. Electrical power, current, and voltage: Upon initial installation, within 370 days before testing and after major maintenance. b Fuel mass flow rate: Upon initial installation, within 370 days before testing, and after major maintenance. Fuel mass scale: Upon initial installation, within 370 days before testing, and after major maintenance. DEF mass flow rate: Upon initial installation, within 370 days before testing, and after major maintenance. c DEF mass scale: Upon initial installation, within 370 days before testing, and after major maintenance. Intake-air, dilution air, diluted exhaust, and batch sampler flow rates: Upon initial installation, within 370 days before testing and after major maintenance. d Raw exhaust flow rate: Upon initial installation, within 185 days before testing and after major maintenance. d Gas dividers: Upon initial installation, within 370 days before testing, and after major maintenance. Gas analyzers (unless otherwise noted): Upon initial installation, within 35 days before testing and after major maintenance. FTIR and photoacoustic analyzers: Upon initial installation, within 370 days before testing and after major maintenance. GC-ECD: Upon initial installation and after major maintenance. PM balance: Upon initial installation, within 370 days before testing and after major maintenance. Pressure, temperature, and dewpoint: Upon initial installation, within 370 days before testing and after major maintenance. § 1065.308: Continuous gas analyzer system response and updating-recording verification—for gas analyzers not continuously compensated for other gas species Upon initial installation or after system modification that would affect response. § 1065.309: Continuous gas analyzer system-response and updating-recording verification—for gas analyzers continuously compensated for other gas species Upon initial installation or after system modification that would affect response. § 1065.310: Torque Upon initial installation and after major maintenance. § 1065.315: Pressure, temperature, dewpoint Upon initial installation and after major maintenance. § 1065.320: Fuel flow Upon initial installation and after major maintenance. § 1065.325: Intake flow Upon initial installation and after major maintenance. § 1065.330: Exhaust flow Upon initial installation and after major maintenance. § 1065.340: Diluted exhaust flow (CVS) Upon initial installation and after major maintenance. § 1065.341: CVS and PFD flow verification (propane check) Upon initial installation, within 35 days before testing, and after major maintenance. e § 1065.342 Sample dryer verification For thermal chillers: Upon installation and after major maintenance. For osmotic membranes; upon installation, within 35 days of testing, and after major maintenance. § 1065.345: Vacuum leak For laboratory testing: Upon initial installation of the sampling system, within 8 hours before the start of the first test interval of each duty-cycle sequence, and after maintenance such as pre-filter changes. For field testing: After each installation of the sampling system on the vehicle, prior to the start of the field test, and after maintenance such as pre-filter changes. § 1065.350: CO 2 NDIR H 2 O interference Upon initial installation and after major maintenance. § 1065.355: CO NDIR CO 2 and H 2 O interference Upon initial installation and after major maintenance. § 1065.360: FID calibration THC FID optimization, and THC FID verification Calibrate all FID analyzers: upon initial installation and after major maintenance. Optimize and determine CH 4 response for THC FID analyzers: upon initial installation and after major maintenance. Verify CH 4 response for THC FID analyzers: upon initial installation, within 185 days before testing, and after major maintenance. Verify C 2 H 6 response for THC FID analyzers if used for NMNEHC determination: upon initial installation, within 185 days before testing, and after major maintenance. § 1065.362: Raw exhaust FID O 2 interference For all FID analyzers: upon initial installation, and after major maintenance. For THC FID analyzers: upon initial installation, after major maintenance, and after FID optimization according to § 1065.360. § 1065.365: Nonmethane cutter penetration Upon initial installation, within 185 days before testing, and after major maintenance. § 1065.366: Interference verification for FTIR analyzers Upon initial installation and after major maintenance. § 1065.369: H 2 O, CO, and CO 2 interference verification for ethanol photoacoustic analyzers Upon initial installation and after major maintenance. § 1065.370: CLD CO 2 and H 2 O quench Upon initial installation and after major maintenance. § 1065.372: NDUV HC and H 2 O interference Upon initial installation and after major maintenance. § 1065.375: N 2 O analyzer interference Upon initial installation and after major maintenance. § 1065.376: Chiller NO 2 penetration Upon initial installation and after major maintenance. § 1065.378: NO 2 -to-NO converter conversion Upon initial installation, within 35 days before testing, and after major maintenance. § 1065.390: PM balance and weighing Independent verification: Upon initial installation, within 370 days before testing, and after major maintenance. Zero, span, and reference sample verifications: Within 12 hours of weighing, and after major maintenance. § 1065.395: Inertial PM balance and weighing Independent verification: Upon initial installation, within 370 days before testing, and after major maintenance. Other verifications: Upon initial installation and after major maintenance. a Perform calibrations and verifications more frequently than we specify, according to measurement system manufacturer instructions and good engineering judgment. b Perform linearity verification either for electrical power or for current and voltage. c Linearity verification is not required if DEF flow rate comes directly from the ECM signal as described in § 1065.247(b). d Linearity verification is not required if the flow signal's accuracy is verified by carbon balance error verification as described in § 1065.307(e)(5) or a propane check as described in § 1065.341. e CVS and PFD flow verification (propane check) is not required for measurement systems verified by linearity verification as described in § 1065.307 or carbon balance error verification as described in § 1065.341(h). [86 FR 34536, June 29, 2021]