FTIR Gas Analyzer Performance Evaluation / Qualification for Automotive Testing
|Publication Date:||1 April 2015|
The scope of this document focuses on the tests required by EPA to validate the performance of the FTIR system following the section in the Code of Federal Regulations Part 1065 (40CFR1U.1065 and hereafter referred to as "EPA Part 1065") on the guidelines and performance criteria for various regulated gases. This document focuses on the use of continuous emissions sampling for both Engine and Vehicle testing. Future addenda will be needed to cover bag and other sampling techniques.
Gas components that do not currently have performance criteria but may soon be regulated are noted and EPA suggestions as to what should be required are applied. This will help ensure that the FTIR will be recognized as a valid and alternative tool for engine exhaust emissions testing. Components in engine exhaust that are specifically called out in this document include: carbon monoxide (CO), carbon dioxide (CO2), oxides of nitrogen (NO, NO2 and N2O), ammonia (NH3), methane (CH4), and formaldehyde (H2CO). Others may be added as needed by following this standard operating procedure and determining the certification requirements from EPA or other governing bodies as required.
This SAE standard references the specific sections in the EPA Part 1065 certification test requirements (current as of April 23, 2014) for all of the steps required to provide proof of performance. The document provides the user a guideline for the FTIR gas analyzer as applied to engine or vehicle emissions testing. This document is applicable to a wide range of fuels including, but not limited to, diesel, gasoline, natural gas, liquid petroleum gas (LPG), blends, bio-fuel and bio-fuel blends.
While this document specifically references 191 °C as the temperature used for performance validation, this may not always be the case. The temperature specification applies specifically to the raw gaseous emissions that have not been diluted. If the analysis is to be performed upon a diluted gas stream where the emission gas is at a lower temperature then the analyzer can also be run at a lower temperature provided that the components of interest do not condense or react prior to reaching the analyzer.
The purpose of this document is to provide a set of guidelines and test procedures for the use of FTIR systems for engine emission testing as defined by EPA Part 1065. Each FTIR system manufacturer will need to provide a set of procedures to the end user that when performed prior to the emission testing would demonstrate and confirm that the FTIR has maintained its calibration and is functioning properly. Those procedures are not described below because they are dependent upon the instrument manufacturer.