Extech Instruments CO240 User manual

Brand: Extech Instruments

Model: CO240

Category: Measuring, testing & control

Type: User manual

Extech Instruments CO240 accurately measures Carbon Dioxide (CO2), Air Temperature, and Relative Humidity. Perfect for indoor air quality monitoring, the CO240 calculates Dew Point and Wet Bulb Temperatures, and features an adjustable CO2 high alarm threshold with audible beeper. Data streaming to PC allows for real-time readings and analysis.



 USERMANUAL



CarbonDioxideMeter



ModelCO240



AdditionalUserManualTranslationsavailableatwww.extech.com

EXTECHINSTRUMENTS

2CO240‐en‐GB_v1.711/16

Introduction



Thank you for selecting the Extech Instruments Model CO240. The CO240 measures Carbon

Dioxide(CO

),AirTemperature,andRelativeHumidity.ItalsocalculatesDewPointTemperature

and Wet Bulb Temperature. The user‐programmable high alarm feature alerts the user when

levelrisesabovetheprogrammedlimitandthedatastreamingfeatureallowsreadingstobe

capturedinrealtimebyPC(USB connection). This deviceisshippedfullytestedand calibrated

and, with proper use, will provide years of reliable service. Please visit our website

(www.extech.com) to check for the latest version of this User Guide, Product Updates, and

CustomerSupport.



Features

 PortablemetermeasuresCO

,AirTemperature,andRelativehumidityaccurately

 MeasuresCO

(0~9,999ppm)usingNDIR(Non‐dispersiveInfraredTechnology)

 DualdisplayindicatesRelativeHumidity/AirTemperatureandCO



 CalculatesDewPointandWetBulbTemperature

 AdjustableCO

highalarmthresholdwithaudiblebeeper

 Tripodmount

 USBcableforPCdatastreaming(softwaresupplied)

 BatteryorACAdaptorPowered



EXTECHINSTRUMENTS

3CO240‐en‐GB_v1.711/16

MeterDescription

1. Sensors

2. LCDScreen

3. HOLD/UpArrowButton

4. MODE/

LeftArrowButton

5. SETButton

6. ACAdaptorjack

7. TripodMount

8. POWER( )Button

(Max/Min)/ RightArrowButton

10. UNITButton

11.  DownArrowButton

12. USBPCinterfaceport



Batterycompartmentonrearofmeter.

EXTECHINSTRUMENTS

4CO240‐en‐GB_v1.711/16

Operation

Poweringthemeter

Momentarily press the POWER button to power on the meter. Hold the POWER button for 2

seconds to turn off the meter. During measurement, if the alarm is sounding (audible beeper)

pressthePOWERbuttonmomentarilytoturnoffthebeeper.Pressagaintoactivatethebeeper

function. The alarm beeper is set to ON by default. The meter can be powered by 6 AAA

batteriesorACAdaptor.

Recommendation:Fordatalogging,powertheunitusinganAC/DCadaptorinordertoconserve

batterypower.

AutoPowerOff

TheCO240 will automatically turn offafter20minutes of inactivity.To disable theautopower

offfunction: With themeterOFF,pressand hold the  HOLDbuttonand then pressthePOWER

button.TheLCDwillshow“n”,andwillthenreturntonormalmeasurementmode.

Measurements

Whenthemeteristurnedon,aself‐testisimplemented.DuetothenatureoftheNDIRsensor,

ittypicallyrequiresapproximatelytenminutestoobtainstable,accuratereadings.IftheUSB

cableisconnectedtotheCO240,theUSBsymbolwillbeshownontheLCD.

Thetemperatureand

relativehumidityreadingswillalternateonthelowerLCDlinealongwith

theCO

readingonthetopdisplayline.UsetheMODEbuttontoswitchtoDP(DewPoint

Temperature)andWB(WetBulbTemperature)modes(lowerdisplayline).

MaximumandMinimumReadingsMemory

Momentarily press the MAX/MIN button to review the maximum and minimum readings

captured since the meter was powered on. Pressing the button once will show the maximum

value.Pressingthebuttonagain willdisplaytheminimumvalue.Pressingthebuttonathirdtime

willreturnthemetertoitsnormalmodeofoperation.WhileinMAX‐MINmode,press and hold

theHOLDbuttonfor2secondstoreset(clear)thestoredmaximumandminimumvalues.

Selecting

Funitsofmeasure

PresstheUNITbuttontoselectthedesiredtemperatureunitofmeasure.

Calibration

Pressandholdthe SET+UNITbuttonsfor2secondstoentertheself‐calibrationmode.Ensure

thatthereisaslittleCO

presentaspossible.Itisrecommendedthatthisbedoneinoutsideair.

The LCD will display “CAL” and will perform a 60‐second countdown as it performs the

calibration. A reading of “400” is displayed as a normal CO

 level reference value during the

calibration. After the calibration has completed, the meter will return to its normal mode

operation.

EXTECHINSTRUMENTS

5CO240‐en‐GB_v1.711/16

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Downarrow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

1000ppm(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.



EXTECHINSTRUMENTS

6CO240‐en‐GB_v1.711/16

MaintenanceandTroubleshooting



BatteryReplacement

WhenthebatteryiconappearsontheLCD,thebatteriesmustbereplaced.

Inadownwardmotion,slidetherearbatterycompartmentcoveroffofthemeterhousing.

Removetheoldbatteriesandreplacewithnewbatteries(allofthesametype)observingcorrect

polarity.Thismeterusessix(6)1.5V

AAAbatteries.Pleasereplacethebatterycompartment

coverbeforeattemptingtousethemeter.

Neverdisposeofusedbatteriesorrechargeablebatteriesinhouseholdwaste.

As consumers, users are legally required to take used batteries to appropriate

collection sites, the retail store where the batteries were purchased, or wherever

batteries

aresold.

Disposal: Do not dispose of this instrume nt in household waste. The user is obligated to take

end‐of‐life devices to a designated collection point for the disposal of electrical and electronic

equipment.



BatterySafetyReminders

o Pleasedisposeofbatteriesresponsibly;observeallrelevantregulations.

o Neverdispose

ofbatteriesinafire;batteriesmayexplodeorleak.

o Nevermixbatterytypes;installnewbatteriesofthesametype.



Troubleshooting/ErrorMessageDisplays

ErraticReadings ReplacethebatteriesorusetheAC/DCadaptorandcheckagain.

ER1Display CO

,TemperatureorHumiditysensorfailureorasensorcommunication

error.Sendforserviceifdisplaypersists.

ER2Display Out‐of‐rangeconditionforCO

,TemperatureorRelativeHumidity.

DetectedreadingexceedsCO

,TemperatureorHumidityrange

specification.Thiserrorisnormalwhenclearingthemaximumand

minimumreadingsintheMAX/MINmode.

“9999”Display ReadingexceedstheCO

maximummeasurementrangeorthebattery

powerisweak.



EXTECHINSTRUMENTS

7CO240‐en‐GB_v1.711/16

Specifications



Display  DualmultifunctionLCD

measurerange 0to9,999ppm

accuracy  ±(75ppm+5%ofreading)0to2,000ppm

OperatingTemperature 0to50°C(32to122°F);0.1°resolution

TemperatureAccuracy ±1°C(1.8°F)

OperatingRelativeHumidity 0to95%RH(avoidcondensation)

RelativeHumidityAccuracy ±5%ofrdgat25°C(77°F)otherwise±7%RH

DewPointTemperature

range‐72.9to47°C(‐99.22to118°F);0.1°resolution

WetBulbTemperaturerange‐11to48.2°C(12.2to118.8°F);0.1°resolution

StorageTemperature‐20to50°C(‐4to122°F)

StorageHumidity 0to95%RH(avoidcondensation)

Power   AAAbatteriesx6pcsorACadaptor

Dimensions 211x60

x40mm(8.3x2.4x1.6")

Weight  181.4g(6.4oz.)

Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

ISO‐9001Certified

www.extech.com



Extech Instruments CO240 User manual

Brand: Extech Instruments

Model: CO240

Category: Measuring, testing & control

Type: User manual

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Extech Instruments CO240 User manual

Extech Instruments CO240 User manual

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