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

Operation

BATTERY INSTALLATION

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,
display, a beeper sounds and readings are no longer displayed. (Press any key but the
to stop the beeps). Replace the batteries to resume normal operation.
You, as the end user, are legally bound (Battery ordinance) to return all used
batteries and accumulators; 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

POWER ON/OFF

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

TAKING MEASUREMENT

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 sensor to respond and 30 minutes for RH.
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NOTE: Do not hold the meter close to your mouth or any other source of CO
AIR, DP and WBT Measurements
Press the DP/WBT button to switch temperatures display. The lower left display will cycle
from "AIR" air temperature, "DP" dew point temperature and " Sn" wnt bul temperature
button to
, temperature and humidity readings displayed.
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and "Lob" will appear on the
.
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CO250-EU V1.2 6/09