ndir gas sensor for coal mines

{"cid":"91211450","title":"YJJ Mipex-02-3-I-1-1A (40) NDIR Non-dispersive Infrared Optical Gas Sensor for Coal Mines","imgUrl":"https:\/\/img.chinax.com\/nimg\/5e\/47\/790edfeaa4e87f943393125652e1-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"YJJ","Model Number":"Mipex-02-3-I-1-1A (40)","Minimum Order Quantity":"1","Delivery Time":"5-8 days","Place of Origin":"CHINA","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram","Supply Ability":"2200","Packaging Details":"Box pack","Measurement of gas":"Methane CH\u2084","Measurement range":"0 - 40% VOL","Measurement accuracy":"\u00b10.2% VOL","Resolution":"0.01% VOL","Linearity":"<1% FS","Cross-interference":"Low interference","Preheating time":"\u2264120s","Response time T90":"\u22645s"}}

{"cid":"91188394","title":"High Precision Gas Volume Concentration Measurement With KGD MQ 520 Portable Coal Gas Analyzer","imgUrl":"https:\/\/img.chinax.com\/nimg\/44\/a5\/3a4932f9aadbef0cb4a3f011f3a1-200x200-1.jpg","attrs":{"Model Number":"KGD-MQ-520","Minimum Order Quantity":"1PCS","Delivery Time":"5-8 work days","Certification":"CE","Place of Origin":"CHINA","Payment Terms":"L\/C,D\/A,D\/P,T\/T,Western Union,MoneyGram","Supply Ability":"1000 Piece\/Pieces per Week negotiable","Packaging Details":"each unit has individual box and all boxes are packed in standard packages or customers requests available","Measured Components":"CO\/CO\u2082\/CH\u2084\/H\u2082\/O\u2082\/C\u2082H\u2082\/C\u2082H\u2084\/C\u2099H\u2098*\/Calorific Value","Measurement Principle":"CO\/CO\u2082\/CH\u2084\/C\u2082H\u2082\/C\u2082H\u2084\/C\u2099H\u2098: NDIR; H\u2082: TCD; O\u2082: ECD","Measurement Range":"CO\/CO\u2082\/CH\u2084\/H\u2082: (0 - 100)%; O\u2082: (0 - 25)%; C\u2082H\u2082\/C\u2082H\u2084\/C\u2099H\u2098: (0 - 10)% (Optional)","Linear Error":"CO\/CO\u2082\/CH\u2084\/C\u2082H\u2082\/C\u2082H\u2084\/C\u2099H\u2098: \u00b11%F.S.; O\u2082\/H\u2082: \u00b12%F.S.","Resolution":"0.0001","Repeatability":"\u2264 1%"}}