134 Operating the Dryer4.1 Overview of controls4.1.1 Dryer Controls4.1.2 CO Analyser ControlsRef. Description1 Power “ON” indicator2 Service interval indicator3 Temperature Units4 LCDSoftware versionSizing dewpointActual dewpointDewpoint sensor faultService requiredEconomy mode1.1-40-39errserECOppm COMODERef. Description1 Mode Selection2 UP Key3 Down Key4 Enter / Return Key5 LCDCurrent Measured CO value (ppm)Gas Alarm