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 E—Exhaust Emission Test Procedures (§89.401 to §89.425) > 89.406—Pre-test procedures.

89.406—Pre-test procedures.

(a) Allow a minimum of 30 minutes warmup in the standby or operating mode prior to spanning the analyzers.
(b) Replace or clean the filter elements and then vacuum leak check the system per § 89.316(a). Allow the heated sample line, filters, and pumps to reach operating temperature.
(c) Perform the following system checks:
(1) Check the sample-line temperatures (see § 89.309(a)(4)(ii) and (a)(5)(i)(A) ).
(2) Check that the system response time has been accounted for prior to sample collection data recording.
(3) A hang-up check is permitted, but is optional.
(d) Check analyzer zero and span at a minimum before and after each test. Further, check analyzer zero and span any time a range change is made or at the maximum demonstrated time span for stability for each analyzer used.
(e) Check system flow rates and pressures.

Code of Federal Regulations

[59 FR 31335, June 17, 1994. Redesignated and amended at 63 FR 56995, 57015, Oct. 23, 1998]