Model 407112 Version 4.1 03/06
5
Operation
Connecting the sensor
1. The sensor plug is inserted in the meter’s sensor jack at the top of the meter. The plug
and jack are keyed so that the plug can only fit in the jack one way.
2. Turn the plug carefully until it lines up with the jack and then firmly push the plug in
place. Do not apply undue force or try to twist the plug side-to-side.
3. If the sensor is not connected to the meter or if the sensor is defective, the LCD display
will indicate dashed lines in place of an air velocity reading.
Meter Power
1. Press the POWER button to turn the meter on. If the display does not switch on, check
that a fresh 9V battery is installed. To access the rear battery compartment, first
remove the meter’s rubber protective holster.
2. Press the POWER button to turn the meter off.
3. The meter is equipped with an AUTO POWER OFF feature. The meter automatically
shuts off after 10 minutes to conserve battery energy. To defeat this feature, press the
MAX/MIN button. This will activate the Record / Recall feature.
Measuring Air Velocity and Temperature
1. Determine if the vane sensor will be held or placed on a tripod; a threaded tripod
mounting hole is located on the vane sensor handle.
2. Place the sensor in the air stream under test. Ensure
that the air enters the vane on the opposite side of the
yellow dot. Refer to the diagram.
3. Read the Air Velocity and Temperature measurements
directly on the LCD.
4. To calculate Air Volume in CFM (cubic feet per minute)
or CMM (cubic meters per minute) refer to the ‘Useful
Equations and Conversions’ section.
Selecting the Temperature unit of measure (
o
C/
o
F)
Press the
o
C/
o
F key to select the temperature unit of measure. The display will indicate the
currently selected unit of measure.
Selecting the Air Velocity unit of measure
Press the UNIT button to change the unit of measure for Air Velocity measurements. The
display will reflect the current selection. A list of measurement units is printed on the meter
faceplate beneath the UNIT button and in the specifications earlier in this manual.
Data Hold
To freeze the LCD display, momentarily press the HOLD button. The 'DH' icon will appear
on the LCD and the reading will remain unchanged. Momentarily press the HOLD button
again to return to normal operation (the 'DH' icon will switch off).
Record and Recall MIN / MAX Function
1. To begin capturing the Minimum (MIN) and Maximum (MAX) air velocity and
temperature readings, press the MIN/MAX key.
2. Now, use the MIN/MAX button to toggle the view from MIN to MAX and from MAX to
MIN readings. The ‘MAX’ or ‘MIN’ will appear along with the recalled reading for
convenience.
3. To return to normal operation, press and hold the MIN/MAX button until the ‘MAX’, and
‘MIN’ icons switch off.
airflow
yellow
dot
Side view of Vane
