Extech Instruments CO220 Carbon Monoxide Alarm User Manual

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6 CO220-en-GB_V1.3 07/13

VENT.R(CO

‐baseddemand‐controlledventilation)

‐baseddemand‐controlledventilationreferstothepracticeofusingcarbondioxide

concentrationsasanindicatorforaper‐personventilationrate.Inthiscontext,CO

ismonitored

asabyproductofrespirationratherthanasanindoorcontaminant.Therateatwhichpeople

produceCO

varieswithdietandhealth,aswellaswiththedurationandintensityofphysical

activity.Themoreexertionanactivityentails,themorecarbondioxideisproduced.

CHANGINGTHE2NDTIERDISPLAYCOMBINATION

RepeatedpressesoftheC/F‐RH%buttonstepthroughthefollowingcombinationsof

parameters:

 Humidity+AirTemperature

 Humidity+WebBulbTemperature

 Humidity+DewPointTemperature

MAX/MINMEMORY

ThemeterautomaticallyrecordsMaximumandMinimumreadingswhenthemeterisswitched

ON.Inthenormalmode,presstheCO

buttontoseethemaximumandminimumlevelsofCO

.

WhileviewingtheMaxorMinreading,pressandholdtheSELECT/RECALLbuttontoresetthe

MAXorMINmemory.The“Clr”iconwillappearfor2secondsandthedisplaywillbegintracking

newMAXandMINreadings.

DATALOGGERMEMORY99READINGS

Theusercanstoreupto99CO

readingsinmemoryforlaterrecall.

PresstheESC‐MEMbuttonmomentarilytosavethecur rentCO



readingwithdate/timestamp.Themeterwillemitashortbeepand

thememorylocationnumberwillrepla cetheRHreadingfor2

secondsbeforereturningtotheRHreading.

Oncethememoryisfull,themeterwilloverwritethefirstdatapoin t

storedandcon tinueto overwriteexistingreadings

asnewreadings 

arestored.

TorecallthedatausetheSEL ECT/RECALLbutton.Themidd letierdisplaywillshowthe

memorylocationnumberandthetop tierdisplaywillshow thestoredreadinginppm.The

bottomtierdisplayshowsthedate/timestampforthedisplayedreading.

Pressthe

F‐RH%buttonmomentarilytoreturntothenormaloperatingmode.

PressandholdtheSELECT/RECALLbuttontoresetthe99pointmemorybank,the“Clr”iconwill

appearfor2secondsbeforereturningtothenormaldisplaymode.



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Extech Instruments CO220 Carbon Monoxide Alarm User Manual