CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 89—CONTROL OF EMISSIONS FROM NEW AND IN-USE NONROAD COMPRESSION-IGNITION ENGINES > SUBPART D—Emission Test Equipment Provisions (§89.301 to §89.331) > 89.325—Engine intake air temperature measurement.

89.325—Engine intake air temperature measurement.

(a) Engine intake air temperature measurement must be made within 122 cm of the engine. The measurement location must be made either in the supply system or in the air stream entering the supply system.
(b) The temperature measurements shall be accurate to within ±2 °C.

Code of Federal Regulations

[59 FR 31335, June 17, 1994. Redesignated at 63 FR 56995, Oct. 23, 1998]