但是价格高且样品质量要求高，对操作员素质要求也很高，一般小厂难以承受。红外分析法则简单可行。其工作原理是基于某些气体对不同波长的红外线辐射具有选择性吸收的特性，其吸收程度取决于被测气体的浓度。对于不同的分子化合物，每种分子只能吸收某一波长范围的红外辐射能，即每种分子化合物都有一个或几个特定的吸收频率，叫特征频率。CO、CO2有其固定的特征频率，因此烟气中的CO、CO2量很容易被检测出来。红外分析仪还有以下几个方面的优点：良好的选择性。
PV063R1K1T1NFR1
PV063R1K1T1NFHS
PV063R1K1T1NMM1
PV063R1K1T1NMRC
PV063R1K1T1NFWS
PV063R1K1T1NFRC
PV063R1K1T1NFF1
PV080L1K1T1NFFC
PV080R1K1B1NSLB
PV080L1K1T1NFHS
PV080R1L1T1MULC
PV080R1K1A1NFWS
PV080R1K1T1NFRL
PV080R1K1T1NGLA
PV080R1K1T1NMMC
PV080R1L8L3NULC
PV080R1L8T1NULC
PV092R1K8T1N001
PV092R1K1T1NFRZ
PV092R1K1T1NMM1
PV092R1K1T1NMRK
PV092R1K4T1NFHS
PV092R1K1T1NKLC
PV092R1K1T1VMMC
PV092R1L1T1WTCC
PV092R1K1T1NF
PV092R1D1T1NMMC
PV092R1K1T1NGLC
PV092R1K1T1NMF1
PV092R1K1T1WFR1
PV092R1K1T1NULZ
PV092R1K1T1NHLC
PV092R1K1T1NFFC
PV092R1K1A1NFWS
PV092R1K1T1NFHS
PV092R1K1T1NFF1
PV092R1K1T1NFWS
PV092R9K1T1NMMC
PV092R1K1T1NFR1
PV092R9K1T1NFWS
PV092R1K1T1N001
PV092R1K1T1EMMC
PV092R1K1S1NFWS
PV092R1K4T1NMR1
PV092R1L1L3WTCC
PV092R1K1T1NUPM
PV092R1K8T1NMMC
PV092R1K1T1VFDS
PV092R1K1T1NMRC
PV092R1K1T1WMM1
PV092R1K1T1PFDS
PV092R1K1T1WMRC
PV092R1K1A1NMMC
PV092R1K1T1NMMC
PV092R1K8T1VMMC
PV092R1K1T1NMMK
PV092L1K1T1NFWS
PV092R1K1T1NFDS
PV092R1K1T1NKLA
PV092L1K1T1NMMC
PV092R1K4T1NFR1
PV092R1K1T1NMFC
PV092R1K1T1N100
PV092R1K8T1NFWS
PV092R1K1JHNMMC
PV092R1K4T1NMMC
PV092R1K1A4WFRZ
PV092R1K1AYNMRZ
PV092R1K1T1WFDS
PV092R1K1T1NFRC
PV092R1K1T1NHCC
PV092R1D1T1VMMC
PV092R1K1T1NMRZ
PV092R1K1T1WMR1
PV092R1K1T1WMMC
PV092R1K1T1NMR1
PV092R1L1T1NMMC
PV092R1K1T1NFFP
PV092L1K1T1N001
PV092R1D1T1NGLC
PV092R1K1T1NMLA
PV092R1K4T1NFPD
PV092R1L1T1NFPD
PV092L1K1J1NFR1
PV092R1K1A1NSLA
PV140R1K1T1NFRL
PV140L1K8T1NSLC
PV140R1K1T1NTCB
PV140R1L1A1NF
PV140L9G3B1NTCC
PV140R1K1T1NWLA
PV140R1K1T1NSCA
PV140R1D3T1VFHS
PV140L1G1T1NFFP
PV140L1K1T1NFFC
PV140L1K1T1NFFP
PV140L1K1T1NFWS
PV140L1L1T1NWCC
PV140R1D1T1NFFC
PV140R1F1T1NFHS
PV140R1F1T1NYCC
PV140R1F3T1NFFC
PV140R1F3T1NFRP
PV140R1G1T1VFFC
PV140R1K1A1NSCC
PV140R1K1B1NFWS
PV140R1K1B1NUPG
PV140R1K1T1NFDS
PV140R1K1T1NFFC
PV140R1K1T1NFFD
PV140R1K1T1NFFP
PV140R1K1T1NFF1
PV140R1K1T1NFHS
PV140R1K1T1NF
PV140R1K1T1NFRC
PV140R1K1T1NFRD
PV140R1L1T1NUPG
PV140R1L1T1NWCC
PV140R1L4T1NUPG
PV140R1K1T1NMMC
PV140R1K1T1NMRK
PV140R1K1T1NMRZ
PV140R1K1T1NULC
PV140R1K1T1NWCC
PV140R1K1T1NWLC
PV140R1K1T1WMMC
PV140R1L1T1NMMC
PV140R9K1T1NUPZ
PV140R9L1LKNWCC
PV140R9K1A1NSLCK0173
PV140R9K1T1NFDSK0186
PV140R9K1T1NFFCK0011
PV140R9K1T1NFHSK0017
PV140R9K1T1NFRCK0107
PV140R9K1T1NFWSK0032
PV140R9K1T1NFWSK0155
PV140R9K1T1NKCCK0175
PV140R9K1T1NMLCK0081
PV140R9K1T1NSLCK0003
PV140R9K1T1WSCCK0072
PV140R9K4T1NFFPK0088
PV140R9K4T1NZCBK0154
PV140R9K4T1WFRPX5918
PV140L9G1T1NFFPK0083
由于电网有一定的阻抗，电网的阻抗包括，变压器的阻抗Z0，线路的阻抗Z1和Z2，的阻抗就Z=(Z0+Z1+Z2)。当设备1向电网注入谐波电流时(记为In)，则在电网的阻抗Z上产生了谐波电压(记为Un)，于是设备2的电源输入端就出现了谐波电压Un。如果谐波电压过了设备2能够承受的程度，设备2就会受到这个谐波电压的干扰。一般电子设备允许的谐波畸变率为UTHD5%。在现实中，设备1往往是中频炉、变频器、直流电机驱动器等工作电流发生剧烈变化的设备，设备2往往是PL数控机床、计算机、精密测量仪器等设备。
