['Air Programs']
['Air Emissions']
07/09/2024
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§1065.201 Overview and general provisions.
(a) Scope. This subpart specifies measurement instruments and associated system requirements related to emission testing in a laboratory or similar environment and in the field. This includes laboratory instruments and portable emission measurement systems (PEMS) for measuring engine parameters, ambient conditions, flow-related parameters, and emission concentrations.
(b) Instrument types. You may use any of the specified instruments as described in this subpart to perform emission tests. If you want to use one of these instruments in a way that is not specified in this subpart, or if you want to use a different instrument, you must first get us to approve your alternate procedure under §1065.10. Where we specify more than one instrument for a particular measurement, we may identify which instrument serves as the reference for comparing with an alternate procedure. You may generally use instruments with compensation algorithms that are functions of other gaseous measurements and the known or assumed fuel properties for the test fuel. The target value for any compensation algorithm is 0% (that is, no bias high and no bias low), regardless of the uncompensated signal's bias.
§1065.202 Data updating, recording, and control.
Your test system must be able to update data, record data and control systems related to operator demand, the dynamometer, sampling equipment, and measurement instruments. Set up the measurement and recording equipment to avoid aliasing by ensuring that the sampling frequency is at least double that of the signal you are measuring, consistent with good engineering judgment; this may require increasing the sampling rate or filtering the signal. Use data acquisition and control systems that can record at the specified minimum frequencies, as follows:
| Applicable test protocol section | Measured values | Minimum
command and control frequency a | Minimum
recording frequency bc |
|---|---|---|---|
| a The specifications for minimum command and control frequency do not apply for CFVs that are not using active control.
b 1 Hz means are data reported from the instrument at a higher frequency, but recorded as a series of 1 s mean values at a rate of 1 Hz. c For CFVs in a CVS, the minimum recording frequency is 1 Hz. The minimum recording frequency does not apply for CFVs used to control sampling from a CVS utilizing CFVs. d Dilution air flow specifications do not apply for CVS dilution air. | |||
| §1065.510 | Speed and torque during an engine step-map | 1 Hz | 1 mean value per step. |
| §1065.510 | Speed and torque during an engine sweep-map | 5 Hz | 1 Hz means. |
| §1065.514; §1065.530 | Transient duty cycle reference and feedback speeds and torques | 5 Hz | 1 Hz means. |
| §1065.514; §1065.530 | Steady-state and ramped-modal duty cycle reference and feedback speeds and torques | 1 Hz | 1 Hz. |
| §1065.520; §1065.530; §1065.550 | Continuous concentrations of raw or dilute analyzers | 1 Hz. | |
| §1065.520; §1065.530 §1065.550 | Batch concentrations of raw or dilute analyzers | 1 mean value per test interval. | |
| §1065.530; §1065.545 | Diluted exhaust flow rate from a CVS with a heat exchanger upstream of the flow measurement | 1 Hz. | |
| §1065.530; §1065.545 | Diluted exhaust flow rate from a CVS without a heat exchanger upstream of the flow measurement | 5 Hz | 1 Hz means. |
| §1065.530; §1065.545 | Intake-air or raw-exhaust flow rate | 1 Hz means. | |
| §1065.530; §1065.545 | Dilution air flow if actively controlled (for example, a partial-flow PM sampling system) d | 5 Hz | 1 Hz means. |
| §1065.530; §1065.545 | Sample flow from a CVS that has a heat exchanger | 1 Hz | 1 Hz. |
| §1065.530; §1065.545 | Sample flow from a CVS that does not have a heat exchanger | 5 Hz | 1 Hz means. |
[79 FR 23759, Apr. 28, 2014, as amended at 81 FR 74162, Oct. 25, 2016]
§1065.205 Performance specifications for measurement instruments.
Your test system as a whole must meet all the calibrations, verifications, and test-validation criteria specified elsewhere in this part for laboratory testing or field testing, as applicable. We recommend that your instruments meet the specifications in this section for all ranges you use for testing. We also recommend that you keep any documentation you receive from instrument manufacturers showing that your instruments meet the specifications in the following table:
[79 FR 23759, Apr. 28, 2014; 86 FR 34534, Jun. 29, 2021]
['Air Programs']
['Air Emissions']