Introduction: This model is rack type can continuous monitor flue gas for longtime ; It mainly based on micro-flow infrared sensor to measure the CO,CO2,SO2,NO, especially SO2 and NO are measured by low range with 0-200ppm ;It have an analogue output (4-20mA) and digital output (RS232) ; Built-in zero pump ; The resolution is 1ppm ; Accuracy less than 2%FS ; The weight is about 12kg , it have international standard 19 inch enclosure. It usually intergrate into CEMS. Applications: Boiler, furnace exhaust emission gas and combustion efficiency monitoring, cement production line process and security monitoring, Continuous Emission Monitoring System (CEMS). Features : 1.Adopting micro-flow NDIR gas sensor technology , higher precision and life span longer . 2.Measure the lowest range of SO2 / NO are 200ppm . 3.Improve the traditional single beam gas cell to dual beam cells, no cross interference . 4.Diagnostic function could check sensor status online . 5.Sampling flow rate fluctuations had no effect on the measurement results. 6.Accurate measurement of low concentration gas. 7.Built-in zeroing pump to achieve automatic air zero . 8.Real-time continuous monitoring concentration of SO2, NO, CO, CO2, O2 , measurement component is optional . 9.LCD (320*240) display. 10.Digital and analog signal output.