Operation; Battery Installation; Power On/Off; Taking Measurement - Extech Instruments CO250 User Manual

Operation

BATTERY INSTALLATION

POWER ON/OFF

TAKING MEASUREMENT

AIR, DP and WBT Measurements

DATA HOLD

BACKLIGHT

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The meter is powered by 4 AA batteries or a DC adaptor. Install the batteries into the rear battery
compartment observing correct polarity. When an adaptor is used, the batteries will be disconnected
from the meter. The adaptor cannot be used as a battery charger. When the battery voltage drops
below the required level, and "Lob" will appear on the display, a beeper sounds and readings
are no longer displayed. (Press any key but the
resume normal operation.
You, as the end user, are legally bound ( EU Battery ordinance ) to return all used
batteries, disposal in the household garbage is prohibited! You can hand over your
used batteries / accumulators at collection points in your community or wherever batteries
/ accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
Press to turn the meter on and off. At power up, the meter emits a short beep and performs a
30 second countdown for meter warm up. It then enters the normal operation mode with current
CO , temperature and humidity readings displayed.
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The meter starts measurements when powered on and updates readings every second. If the
operating environment changes (ex. from high to low temp.), it takes 30 seconds for CO
respond and 30 minutes for RH.
NOTE: Do not hold the meter close to your mouth or any other source of CO
Press the DP/WBT button to switch temperatures display. The lower left display will cycle from "AIR"
air temperature, "DP" dew point temperature and "WBT" wet bulb temperature.
Press the HOLD button to freeze the readings, the "HOLD" icon is displayed on the left top of the
display. All current readings are held unchanged, except STEL and TWA. Press "HOLD" again to
cancel the hold function.
Press the MODE/ button for more than 1 second to activate or to cancel backlight function.
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to stop the beeps). Replace the batteries to
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sensor to
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