Apparatus for measuring concentration of fuel vapor, oxygen, nitrogen oxide, hydrocarbon, methane, alcohol and hydrogen in air or gas; apparatus for measuring concentration of fuel vapor, oxygen, nitrogen oxide, hydrocarbon, methane, alcohol and hydrogen, and controlling air/fuel ratio in the exhaust gas from internal combustion engines, boilers, incinerators, gas turbines, generators and fuel cells; [ knock sensors; pressure sensors; temperature sensors; outdoor air sensors for measuring air quality; load sensors ]

'air':17,62,66 'air/fuel':37 'alcohol':13,32 'apparatus':1,20 'boiler':47 'cell':54 'combust':45 'concentr':4,23 'control':36 'engin':46 'exhaust':41 'fuel':6,25,53 'gas':19,42,49 'generat':51 'hydrocarbon':11,30 'hydrogen':15,34 'inciner':48 'intern':44 'knock':55 'load':68 'measur':3,22,65 'methan':12,31 'nitrogen':9,28 'outdoor':61 'oxid':10,29 'oxygen':8,27 'pressur':57 'qualiti':67 'ratio':38 'sensor':56,58,60,63,69 'temperatur':59 'turbin':50 'vapor':7,26

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