User manual

EXTECHINSTRUMENTS
4CO50‐en‐GB_V1.212/14
Operation

POWERTHEMETER
Plug the AC adaptor into meter and receptacle to turn on the
meter. Reset the date and time each time the meter power is
cycled. RemovetheadaptororswitchofftheACpowersource
toshutdownthemeter.

GETTINGSTARTED
All LCD display lines will switch ON when power is applied to
meter.TheLEDindicatorwillalsobeONsteadywithanorange
color. The display will now auto zero. Auto zero takes
approximately 60 seconds and then the meter counts down
from9to0.Themeterisnow
inthenormaloperatingmode.

When attempting to manually store the current CO reading, the LED light turns green for one
secondandashortbeepertonewillsound.

The LCDs show the current CO value  in ppm (top), ambient temperature/relative humidity
(middle),andthedateandtime(bottom).

TogglethetemperatureunitsbypressingandholdingtheC/F/%RH▲button.

SETTINGDATE/TIME
Innormaloperation,themeteralternatesthedateandtimedisplays.
PresstheSETbuttontoswitchbetweenthe12‐hoursystem(am/pm)
and the 24‐hour system. Note that the default time display is a 24‐
hourclockformat.
1. PressandholdSETfor3secondstoseeimage
atright.
2. Press▼ todecreaseanumberorpress▲toincreaseanumber
3. PressSEL/RECALLECALLtoscrollthroughtheYEAR‐MONTH‐DAY
4. WhenfinishedchangingtheDate,pressSETtochangetheTime
5. Press▼ todecreasenumberorpress▲toincreasenumber
6. PressSEL/RECALLECALLtoscrollthroughHR‐MIN‐SEC
7. PressSETtoaccessthealarmsetting(seeAlarmsection).
8. Toexit,pressandholdSETfor3seconds.
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