Operation; Battery Replacement - Extech Instruments 451112 Manual

4. OPERATION

4.1 Move the "OFF/ON/HOLD" switch to the ON position to apply meter power.
4.2 Select temperature or airflow via the "°C/°F /airflow" switch. The display will indicate
temperature or airflow.
4.3 Select the air velocity units using the
"Airflow Units" switch, airflow will display in
"m/s", "km/h", "ft/min", or "knots" as
selected. Note that displayed ft/min
readings must by multiplied by 10.
4.4 When measuring, the air should be
striking the vane on the side of the vane
without the yellow dot (see diagram).
4.5 Data Hold: During measurements,
moving the "OFF/ON/HOLD" switch to the
"Hold" position will freeze the displayed
value. Move the switch back to "ON" to cancel the HOLD function.

5. BATTERY REPLACEMENT

When the display indicates "BAT" (low battery), replace the battery. To replace the battery:
a. Remove rear screw (bottom, center), slide the Battery Cover off, and remove
battery.
b. Replace with 9V battery (heavy duty type) and reinstall the cover and rear screw.
c. Make sure the battery cover is secured after changing the battery.
Yellow
Dot
3 Model 451112 Version 2.4 2/04
airflow