浅析废气分析仪类型和取样系统

摩托车HC、CO、NOx、CO2等不同排气成分需要采用不同的测量仪器和方法.通常有不分光红外线法、氢火焰离子化法、化学发光法等;取样方法有直接取样法和稀释取样法,以适用于不同测量法规要求.排放测量系统中影响排放分析精度的因素很多,如分析仪的工作原理、仪器本身的精度、标准气体的纯度、背景气体和水分等对分析仪的干扰、取样系统的选择和设计及试验方法等.

A Brief Analysis of Exhaust Gas Analyzer Type and Sampling System

There are different instruments and methods for measuring emission elements,e.g.HC, CO,NO_x,CO_2.The measuring method includes the non-dispersive infrared method,hydrogen flame ionization method,chemiluminescence method,etc.as for the sampling,there are direct sampling,dilution sampling,etc.meeting different demands of the measuring statutes,there are many factors affecting the emission analysis precision in the measuring system such as the interference of the operation principle of the analyzer,the accuracy of the instrument,the purity of the standard gas,the background gas and moisture contents,etc.with the analyzer,the selection and design of the sampling system and the test method.