AQ COMFORT Instruction & Operations Manual
Version 1.01
Page 18 of 44
4) VELOCITY UNITS: (Velocity Option) Select between feet per second (FPS), meters
per second (MPS), cubic feet per minute (CFM), or cubic meter per minute (CMM).
AIR VELOCITY AND DIFFERENTIAL PRESSURE CAN NOT BE MEASURED
SIMULTANEOUSLY. USER MUST CHOOSE ONE OR THE OTHER.
To change the selection, hit the
SETUP
key. Using the
DOWN
arrow key, scroll
Down to
VELOCITY PROBE
and hit
OK
. The
OFF/ON
selection will be highlighted.
Use the Up & Down arrow keys to change the selection from OFF to ON or vice versa.
With the Velocity Probe Selection
OFF
, the AQ Comfort will measure
Differential
Pressure (∆P)
automatically. With the Velocity Probe Selection
ON
, the AQ Comfort
will measure
Air Velocity (VEL)
automatically. When you have your selection chosen,
hit the
OK
button and the entire Velocity Probe will be highlighted again. Hit the
MEASURE
Button to get back to the Main Measurement screen once you are complete.
5) DUCT SIZE: (Velocity Option). Estimate the cross-section area of your Ducts in
square inches (in
2
) and set this value to obtain automatic & accurate Air Flow
measurements in CFM or CMM.
NOTE: When using the Velocity Feature on the AQ Comfort it is recommended to
ZERO the readings BEFORE using the Pitot tube to ensure proper Velocity
measurements. See Chapter 9 for instructions on Zeroing the AQ Comfort. (Zero Gas
Sensors)
Connecting Pitot Tube
: In air conditioning, heating and ventilating work, it is helpful to
understand the techniques used to determine air velocity. In this field,
air velocity
(distance traveled per unit of time) is usually expressed in feet per minute (FPM). By
multiplying air velocity by the cross section area of a duct, you can determine the air
volume flowing past a point in the duct per unit of time.
Volume flow
is usually measured
in cubic feet per minute (CFM). To make Air Velocity measurements using the AQ
Comfort, you will need to use the
Optional
12” Pitot tube. Follow Steps #5 & #6 above
to (1) turn the Velocity Probe option ON (VEL will appear on the unit’s main screen) and
(2) set up your Duct Size. Connect the supplied hoses from the Pitot tube to the (-)
and/or (+) PRESSURE connections on the bottom of the AQ Comfort.
6) PUMP: Pump status is displayed:
a) AUTO - Automatic sample mode is selected
b) OFF – The internal Pump is turned off.
7) DISPLAY CONTRAST: Select the best value for viewing the LCD screen.
8) BAUDRATE: The communication speed for both the USB port and the Bluetooth
connection is set here. The default setting is 115 kbps.
