NOVELTY - A coal gas components and calorific values measuring method involves measuring the volume concentrations of carbon monoxide, carbon dioxide, methane, CnHm in coal gas by non-dispersive infrared method by selecting narrowband optical filters with center wavelength. The volume concentrations of oxygen are measured by an electrochemical sensor, and the CnHm measured result is corrected by the methane measured value followed by correcting the hydrogen gas measured result by the carbon dioxide and methane measured values for automatically calculating the calorific value.    USE - Method for measuring coal gas components and calorific values.    ADVANTAGE - The method enables measuring components and calorific values in a rapid, accurate and cost-effective manner by using one apparatus.    DETAILED DESCRIPTION - A coal gas components and calorific values measuring method involves measuring the volume concentrations of carbon monoxide, carbon dioxide, methane, CnHm in coal gas by non-dispersive infrared method by selecting narrowband optical filters with center wavelength of CWL/half width bandwidth, and HWBP having 4.66 plus minus 0.05 microns/90 plus minus 5 nm, 4.26 plus minus 0.05 microns/120 plus minus 5 nm, 7.85 plus minus 0.05 microns/180 plus minus 5 nm, 3.46 plus minus 0.05 microns/120 plus minus 5 nm, as represented by the expression as given in the specification. The volume concentrations of oxygen are measuring by a electrochemical sensor, and the CnHm measured result is corrected by the methane measured value followed by correcting the hydrogen gas measured result by the carbon dioxide and methane measured values to obtain accurate carbon monoxide, carbon dioxide, methane, CnHm, hydrogen gas, oxygen contents in the coal gas components for automatically calculating the calorific value.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram illustrating a method for measuring coal gas components and calorific values.'(Drawing includes non-English language text)'