Model 407123 V5.2 2/2006
4
Operation
Initialization and Zero
The meter should always be zeroed at temperature before use using the ZERO button.
Do not rely on the initial zero display.
Note
: The meter does not display negative numbers. Open antenna to desired length.
1. Connect the sensor to the input jack on top of the meter and open antenna to desired
length.
2. Turn on the meter using the Power button. The meter will perform a self-test during
which the display will count down from 9999 to 0000.
3. Select the desired temperature units using the C/F select button. The LCD will reflect
the selection.
4. Select the desired air velocity units using the UNIT button. The LCD will reflect the
selection.
5. Place the sensor cover in the UP (ZERO) position.
6. Place the sensor in the area to be measured and allow a short time for the sensor to
reach the temperature of the air under test.
7. Press the ZERO button to zero the meter.
Taking Measurements
1. Zero the meter as described above.
2. Slide the air velocity sensor cover down.
3. Place the sensor in the air current to be measured. Have the air flow meet the sensor
head in the direction of the white dot on the sensor head.
4. View the air velocity and temperature readings on the LCD Display. The large main
LCD display shows the Air Velocity reading. The lower LCD sub-display shows the
temperature reading.
