40 CFR § 1065.303
Summary of required calibration and verifications
June 9, 2020
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
Open Table
| Type of calibration or verification | Minimum frequency1 |
|---|---|
| §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.2 Fuel flow rate: Upon initial installation, within 370 days before testing, and after major maintenance. DEF flow: 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, unless flow is verified by propane check or by carbon or oxygen balance. Raw exhaust flow rate: Upon initial installation, within 185 days before testing and after major maintenance, unless flow is verified by propane check or by carbon or oxygen balance. 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 batch sampler verification3 | Upon initial installation, within 35 days before testing, and after major maintenance. |
| §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: CO2 NDIR H2O interference | Upon initial installation and after major maintenance. |
| §1065.355: CO NDIR CO2 and H2O 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 CH4 response for THC FID analyzers: Upon initial installation and after major maintenance. Verify CH4 response for THC FID analyzers: Upon initial installation, within 185 days before testing, and after major maintenance. Verify C2H6 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 O2 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: H2O, CO, and CO2 interference verification for ethanol photoacoustic analyzers | Upon initial installation and after major maintenance. |
| §1065.370: CLD CO2 and H2O quench | Upon initial installation and after major maintenance. |
| §1065.372: NDUV HC and H2O interference | Upon initial installation and after major maintenance. |
| §1065.375: N2O analyzer interference | Upon initial installation and after major maintenance. |
| §1065.376: Chiller NO2 penetration | Upon initial installation and after major maintenance. |
| §1065.378: NO2-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. |
1Perform calibrations and verifications more frequently than we specify, according to measurement system manufacturer instructions and good engineering judgment.
2Perform linearity verification either for electrical power or for current and voltage.
3The CVS verification described in §1065.341 is not required for systems that agree within ±2% based on a chemical balance of carbon or oxygen of the intake air, fuel, and diluted exhaust.
[81 FR 74164, Oct. 25, 2016]
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