Spiroanalyzer gas bench module provide accurate ways to monitor CO and CH4 in lung diffusion test ,using international advanced micro-flow NDIR sensor . This monitor collects sample gas via inside small pump .The gas analysis module is simple structure, easy operation, with power supply modules, RS-232 data communication lines. Multigas analyzer used in Pulmonary function test real-time data display ,contiguous data measurement Measure CO(carbon monoxide )at 0~3000ppm , CH4(methane) at 0~3000ppm ,can update to 0~4000ppm