At present there are many interference source based on design process of gas analyzer of NDIR technology

impact of these disturbance on detection precision as well as severity is different

among which

in IR pool

effects of temperature stability on absorption of gas is large

in addition to specific absorbing gas

constant temperature point is also important. Design a high precision temperature control system based on incremental PID algorithm

select constant temperature point which has the minimum effect on gas absorption and range of temperature control is ± 0. 1 ℃

compared with the existing temperature control system of the same kind

precision is improved about 10 times. The test results are compared with the experimental results under the conditions without temperature control and applied in constant temperature system

it shows that with high precision constant temperature system

SNR of NDIR gas analyzer is improved obviously. The fruit will be directly applied to the national"12·5 "project.