Extech Instruments NON-DISPLAY PORTABLE User's Guide download pdf (Page 3)

CO250-EU-EN v1.5 12/13

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,

and “Lob” will appear on the display, a beeper sounds and readings

are no longer displayed. (Press any key but the

SET

to stop the beeps). Replace the batteries to

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

POWER ON/OFF

Press

SET

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

2, temperature and humidity readings displayed.

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

2 sensor to

respond and 30 minutes for RH.

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 “WBT” wet bulb temperature.

DATA HOLD

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.

BACKLIGHT

Press the MODE/▲ button for more than 1 second to activate or to cancel backlight function.

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Extech Instruments NON-DISPLAY PORTABLE User's Guide Page 3