User Manual

EXTECHINSTRUMENTS

5 CO240‐en‐GB_v1.412/14

AutomaticCO2BaselineCalibration(ABC)

TheABC algorithm continually tracksthesensor’slowestreadingoverafixedtime intervaland

slowlycorrectsforanylong‐termdrift(ascomparedtotheexpectedfreshairvalueof400ppm). 

TheABCperiodis15days,duringwhichtheABCfunctiondefaultisalwayson.

CO2AlarmSetting

Press and hold the SET button for 2 seconds to enter the high CO

 alarm threshold. Press the

HOLDbuttontoincreasethevalue,andtheBKLTbuttontodecreasethevalue.PresstheMODE

button to select the digit to the left and press the MAX/MIN button to select the digit to the

right.Oncethedesiredvalueisset,presstheSETbuttonfor2secondstosavethealarmsetting.

TheLCDwillreturntoitsnormalmode ofoperation.Themeteralarmlimitdefaultis1 000ppm

(OSHA).MomentarilypressthePOWERbuttontotogglethealarmonandoff.

DataStreamingtoPC

The CO240 features real‐time data streaming to a PC using the supplied SW200‐S software.

When the meter is connected to a PC, the USB icon will be visible on the LCD display. Please

installtheUSBdriverandsuppliedsoftwarebeforeattemptingtostreamdata.RefertotheHelp

Utilitywithinthesoftwareprogramforfurtherdetails.