407114 Datasheet, PDF (5/8 Pages) Extech Instruments Corporation. – CFM Thermo Anemometer Air Velocity, Air Flow, and Temperature

Operation
Air Velocity Measurements
1. Connect the sensor to the sensor input jack on top of the meter.
2. Turn on the meter using the POWER button.
3. Select the VELOCITY function using the VEL/FLOW button. The LCD will display VEL
when the velocity mode is selected.
4. Select the desired temperature units using the C/F select button. The LCD will reflect
the current unit selection.
5. Select the desired air velocity units using the UNIT
button. The LCD will reflect the current unit selection.
yellow
dot
6. Place the sensor in the air current with the yellow dot
on the exhaust side of the vane (see diagram)
airflow
7. 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.
Data Hold Feature
1. While taking measurements, press the HOLD button to freeze the LCD reading for later
viewing.
2. The DH indicator will appear on the LCD when the display is in Data Hold mode.
3. Press HOLD again to return to normal operation.
Maximum and Minimum Recording
The 407114 allows the user to record and view the highest (MAX) and lowest (MIN)
readings.
1. Press the RECORD/RECALL button once. The REC indicator will appear on the
display and the meter will begin keeping track of the MAX and MIN values.
2. To view the MAX reading, press RECORD/RECALL again. The MAX indicator along
with the maximum reading will appear on the LCD display.
3. Press RECORD/RECALL again to view the minimum value, the MIN indicator along
with the minimum reading will appear on the LCD display.
4. To return to normal operation, press and hold the RECORD/RECALL button for
approx. 3 seconds. The display indicators REC, MAX, and MIN will disappear.
5
Model 407114 Version 2.0 November 2005