List of Part 1065 Changes, June 2010

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C 260 (e) Changed a section reference to make it easier to locate the allowance to report NMHC as 2% of THC.

C 290 (b) Made a clarification on the NIST traceability requirements of internal calibration weights.

C 295 (c)

As an outcome of the testing performed during the HDIUT PM MA test program, a statement was added to allow the 

use of a PM loss correction for field testing. This allows you to correct to approach the loss seen in a laboratory CVS 

system. We only expect this correction to be used if the measurement system has a documented loss in the sampling 

system that is greater than what is typical in CVS type sampling systems.

C 295 (d)

As an outcome of the testing performed during the HDIUT PM MA test program with an in-situ mass measurement 

device, language was added to state that EPA approves of electrostatic deposition technique for PM collection and that 

the technique must meet 95% collection efficiency, as stated by the manufacturer.

D 307 (d)(9) Added clarification on the requirement of NIST traceability for external calibration weights used during the linearity 

check.

D 340 (e)(8)

A change is made here to accommodate the fact that it may not be possible to meet the maximum in-use pressure at the 

PDP inlet. This is due to the effect of the added restriction from the reference flow meter. Thus if the restrictor valve 

during the calibration is wide open, this is the lowest minimum restriction (or maximum inlet pressure) placed on the 

PDP inlet and the CVS cannot achieve the maximum in-use pressure during calibration. Because of the tight linearity 

of PDPs, we do not expect an abnormally large deviation at the maximum in-use point and thus are making a change to 

1065.340(e)(8) to accommodate a maximum calibration pressure that is lower than what is experienced in-use. 

Requiring the maximum in-use pressure is impractical and would require the manufacturers to add an additional orifice 

plate into the CVS for calibration purposes only.

D 390 (c)(2) Made a clarification on the NIST traceability requirements of internal calibration weights.

F 525

Changed this section to allow you to void the hot start portion of a transient test cycle if the engine stalls, allowing you 

to restart the test sequence by rerunning the hot start portion. This was previously allowed under part 86 and is 

currently allowed for individual modes for discrete mode tests.

F 526 Added in a new 1065.526 in support of the change made to 525.

F 550 (b)(2) Clarify language on drift correction of results for standards consisting of combined, individual measurements of 

exhaust constituents and made language more consistent with 550(b)(1).

G 640 (c)(5) Corrected typo in the end result of the example problem.

G 642 (c) Changed language to show consistency with 1065.640(e).

G 660 (b)(2) Equation revised for typo. “cor” added to the subscript for xTHC[NMC-FID] in equations 660-2, -3, and -4.

H 750 (a)(3)(xi) Add allowance to use N2O in balance nitrogen.
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J 905 (c)(6) To clarify what the ambient requirements are for in-use testing, language was added to state that field testing applies at 

any ambient temperature, pressure and humidity, unless otherwise specified in the standard setting part.

J 905 (d) and 

Table 1

As an outcome of the testing performed during the HDIUT PM MA test program, the requirement to control dilution 

air temperature for field testing was removed and it was recommended that if you choose to directly and actively 

control dilution air temperature, then you should target 25 °C. Currently there are not any PM PEMS manufacturers 

that have the capability of controlling these parameters. This requirement may be reinstated at a future date if 

measurement systems are developed that can meet the laboratory dilution air temperature requirements.

J 905 (d) and 

Table 1

As an outcome of the testing performed during the HDIUT PM MA test program, language was added to allow a filter 

face velocity of (5 to 100) cm/s for flow-through media for in-use testing, which can be verified by engineering 

analysis. This allows for a broader range of velocities to account for the differences between in-use and laboratory 

testing. Non-flow through media are exempt from any FFV requirement. This requirement may be reinstated at a 

future date if measurement systems are developed that can meet the laboratory filter face velocity requirements.

J 905 (d) and 

Table 1

As an outcome of the testing performed during the HDIUT PM MA test program, language was added to allow PM 

PEMS to target a temperature of (32 to 62) °C for filter media and crystal surfaces, where the tolerances apply only 

during sampling onto the media. This tolerance is broader than what is required for the laboratory to account for the 

challenges of in-use testing. This requirement may be reinstated at a future date if measurement systems are developed 

that can meet the laboratory media surface temperature requirement.

J 905 (d) and 

Table 1

As an outcome of the testing performed during the HDIUT PM MA test program, the requirement to control 

temperature and humidity in the weighing environment was removed for in-situ analyzers.

J 905 Table 1 As an outcome of the testing performed during the HDIUT PM MA test program in conjunction with a change made to 

1065.295(c), an exemption to not allow the use of a PM loss correction for laboratory testing was added.

J 905 Table 1

As an outcome of the testing performed during the HDIUT PM MA test program, language was added to exclude PM 

PEMS from meeting the requirements of 1065.308 and 1065.309 as there currently is no practical way to test these inuse PM measurement devices to see if they meet these requirements. This is due to the lack of a suitable reference PM 

sources to conduct the test with.

J 915 (d)(iv)

As an outcome of the testing performed during the HDIUT Gaseous MA test program, language was added to allow 

the use of fuel flow rate data from the ECM to determine the mass of exhaust. This method was shown to be 

comparable to other methods currently allowed via a comparison of results calculated with all three methods during the 

HDIUT gaseous MA test program.

J 915 Table 1 As an outcome of the testing performed during the HDIUT PM MA test program, the frequency and rise/fall time 
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specifications for inertial PM batch analyzers was removed because they are not applicable for this type of testing.

J 920 (a) Made a clarification on the description of the reference to the updating and recording verification in 1065.308 and 309.

J 925 (h) Made a clarification that states that the HC contamination check should occur sometime before the start of the test.

J 940 (a)

As an outcome of the testing performed during the HDIUT Gaseous and PM MA test programs, language was added to 

allow the use of a fixed molar mass for the diluted exhaust mixture for field testing, as determined by engineering 

analysis. The intent here is to not require measurement of the dilution air humidity which would be a challenge for inuse PM measurement.