Regulations last checked for updates: May 17, 2024

Title 40 - Protection of Environment last revised: May 15, 2024
All TitlesTitle 40Chapter IPart 1065Subpart D - Subpart D—Calibrations and Verifications
View all text of Subpart D [§ 1065.301 - § 1065.395]
§ 1065.303 - 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 noiseAccuracy: 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 speciesUpon 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 speciesUpon initial installation or after system modification that would affect response.
§ 1065.310: TorqueUpon initial installation and after major maintenance.
§ 1065.315: Pressure, temperature, dewpointUpon initial installation and after major maintenance.
§ 1065.320: Fuel flowUpon initial installation and after major maintenance.
§ 1065.325: Intake flowUpon initial installation and after major maintenance.
§ 1065.330: Exhaust flowUpon 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 verificationFor 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 leakFor 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 interferenceUpon initial installation and after major maintenance.
§ 1065.355: CO NDIR CO2 and H2O interferenceUpon initial installation and after major maintenance.
§ 1065.360: FID calibration THC FID optimization, and THC FID verificationCalibrate 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 interferenceFor 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 penetrationUpon initial installation, within 185 days before testing, and after major maintenance.
§ 1065.366: Interference verification for FTIR analyzersUpon initial installation and after major maintenance.
§ 1065.369: H2O, CO, and CO2 interference verification for ethanol photoacoustic analyzersUpon initial installation and after major maintenance.
§ 1065.370: CLD CO2 and H2O quenchUpon initial installation and after major maintenance.
§ 1065.372: NDUV HC and H2O interferenceUpon initial installation and after major maintenance.
§ 1065.375: N2O analyzer interferenceUpon initial installation and after major maintenance.
§ 1065.376: Chiller NO2 penetrationUpon initial installation and after major maintenance.
§ 1065.378: NO2-to-NO converter conversionUpon initial installation, within 35 days before testing, and after major maintenance.
§ 1065.390: PM balance and weighingIndependent 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 weighingIndependent 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]
authority: 42 U.S.C. 7401-7671q.
source: 70 FR 40516, July 13, 2005, unless otherwise noted.
cite as: 40 CFR 1065.303
© 2014 CustomsMobile | Disclaimer | Privacy | About