Extech Instruments 407123 User Manual page 3

SENSOR ASSEMBLY
1. Air direction guide (air must enter the
sensor on this side)
2. Air velocity sensor
3. Sensor cover in open position
4. Sensor cover in closed position
5. Temperature sensor
Operation
GETTING STARTED
Keep the sensor protective cover in the closed position (slide the cover up),
while performing all the steps in this section.
1. Connect the sensor plug to the jack at the top of the meter.
2. Press the power button to switch ON the meter. The meter will perform a
self-test while the display counts down from 9 to 0.
3. Select the temperature units with the ℃/℉ button.
4. Select the air velocity units with the UNIT button.
5. Open the telescoping wand to the desired length.
6. Place the sensor in the flow of air. Allow some time for the sensor to accli-
mate to the temperature of the air before performing the next step.
7. Press the ZERO button to null the displayed reading. Note that the display
does not indicate negative numbers.
TAKING MEASUREMENTS
1. Slide the sensor cover down to expose the sensors.
2. Place the sensor in the air flow. The air must enter the sensor opening on
the side of the sensor showing the air flow guide marking (see diagram).
3. See diagram below. The upper display digits (1) indicate the air velocity
reading. The lower digits (2), indicate the temperature reading. Air velocity
(3) and temperature (4) units are shown to the right of the readings.
#NAS100229; r. AA/99072/99077; en-US
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