4
Instrument Overview
Power Key
Record Key
Hold Key
°C or °F key
Recall Key
Battery Compartment
Dual LCD
RS232 Output
Sensors
Remote
Vane Probe
Unit Key
Operating Instructions
1.
Select the Hot probe or Vane probe for location of measurement.
2.
Connect the selected probe to the meter.
3.
Push ON button to turn meter on.
4.
Push HOT WIRE button or VANE button as per a selected probe.
5.
Pressing the 'C/'F button will toggle between 'C and 'F.
6.
Push UNIT button to select the desired display units of the air
velocity.
7. The user can scroll through 5 units: - m/s, km/s, ft/min, knots,
mile/h.
8. If you selected a hot probe, pull down the sensor cover of the probe
(so that air velocity sensor can be seen) and position the probe at
desired location of measurement. The Probe should be positioned
so that a white spot will face the winds. In case the place is too far
and the antenna should be pulled long, do not hold the probe sensor,
but hold the antenna.
Zero Key
Hot/Vane Key
Remote Hot
Wire Probe
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9. Read the velocity and temperature on the LCD.
10. It will take several minutes until the readings get stable after the
probe is positioned.
11. Press "HOLD" button to freeze the display after taking a measure-
ment is finished.
12. "DH" will be displayed on the LCD.
13. Press "HOLD" button again to return to normal operation.
Battery should be replaced when "LBT" is displayed at the top left of the screen.
Volume Measurements
To determine CFM (cubic feet per minute) in a duct, the area of the duct
must first be measured (use the equations below). Then multiply an air
velocity measurement by the area measurement to obtain CFM.
Recording Data
If you want to record the reading changes, press "REC" button when the
reading gets stable. Once activated the meter will begin recording.
Height (H)
Width (W)
Area (A) = Height (H) X Width (W)
Area Equation for Square Ducts:
Radius (R)
Area (A) =
π
X R
2
Where
π
=
3.14
R
2
= (Radius x Radius)
Area Equation for Round Ducts:
CFM (ft
3
/min) = Air Velocity (ft/min) X Area (
in square Inches
)
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