Instruction 19-9220CO2 Monitor 28002.0 OPERATION2.1 Reading ModeWhen the instrument is switched on, there will be a 20 second (approxi-mately) warm up time before the CO2 level present in the atmospheresurrounding the user is displayed. The ON/OFF button should be pressedquickly when switching the unit on and held down for approximately 2seconds when switching the unit off.CO2 PPM CO2MONITOR 300Whe the uit has bee tured o, a “cofidece bee” will soud for0.25 seconds every 30 seconds. This should NOT be interpreted as analarm condition. The unit has two preset alarm levels which are normal-ly set to indicate the presence of Carbon Dioxide in concentrations above5,000 ppm or 10,000 ppm (factory preset levels). The levels can be factoryset at customer secified levels, or ca be reset usig the BACH-COMSoftware (See Section 4.1).When the CO2 level rises above the low alarm level:• The dislay will show the cocetratio ad flash oce er secod.• The Alarm LEDs will flash oce er secod.• The beeper will sound intermittently once per second.When the CO2 level rises above the high alarm level:• The dislay will show the cocetratio ad flash oce er secod.• The Alarm LEDs will be lit continuously.• The beeper will sound continuously.3