... instrument adoptssemiconductor laser source. It has the characters of small volume, light weight,high precision, simple ... flow2.83L/minTest period1min2min 3min 10minSelf-cleaning time≤20 minPrintBuilt-in printerAlarmClass100, 1000Working conditionTemperature10oc-30o ... contain acid, alkali and other corrosive gas.Time of continuous working8hLight source and service lifeSemiconductor laser; ...