Air velocity average for multi points
1. Turn the meter ON, and position the fan at the first point to be
measured. As soon as the first measurement is completed, press
the
HOLD
key (you will hear a single beep) and release it. The
display will show a HOLD indicator above the reading (Fig 4). The
reading is locked at the value display when hold was pressed.
2. Press the
MIN/MAX
record key (you will hear a single beep)
and release it. The display will show a digit numbered from
1 to 8. This number represents the point that is being recorded
(Fig 5).
Repeat this process until all desired points have been measured
and recorded.
3. Once all measurements have been recorded, press the
NEXT
DIGIT/MULTIPOINT AVERAGE
key. The meter will display
the average air velocity reading and number of points
measured (Fig 6). The meter can record a total of eight (8) points
at one time.
4. To CLEAR THE MEMORY of current Multi Point Average readings,
press and hold the
NEXT DIGIT/MULTIPOINT AVERAGE
key
until the unit beeps twice, then release. The unit must be in
velocity/FPM mode to clear current average readings.
Air Flow (CFM) Average for Multipoints
Once the multi-point average is determined:
1. Press the
MODE
button once, and confirm the correct free
area setting is locked into the meter. (If the free area setting must
be adjusted, make necessary changes now).
2. If the free area setting is correct, press the
MODE
button again to
enter the meter's air flow mode.
3. Press
MIN/MAX
record button. The unit will begin to record the
readings. The instrument displays the average velocity by default.
Each of the
MIN/MAX
button cycles the display through:
• Real-time readings
• MIN velocity
• M AX velocity
• Back to AVG velocity
Note:
Feet Per Minute (FPM) readings can be converted to
CFM readings.
4. Press the
HOLD
button to store the readings before
moving the meter away from an air flow source.
5. Press
ON/OFF RESET
twice to clear the current MIN/MAX
average readings and once to turn the meter OFF.
Direct measuring of air flow (Single Point) CFM
Air velocity measurement is calculated by multiplying the air velocity
readings times the free area dimension. Free area is publishing by the
grill and register manufacturer you are servicing.
Determine the free area of the air source you are measuring and enter
it into the meter.
1. Turn the power ON.
2. Press the mode select once (you will hear one beep). The meter
will display
AREA
in upper case letters at the top of the display,
and
1.111
, with a flashing initial digit (Fig 3). This is the free area
default setting.
3. To increase numbers, the flashing digit can be changed by
pressing the
HOLD/ADVANCE
key.
4. To change the value of other digits, press the
NEXT DIGIT
key.
5. Press the
RECORD
key. The flashing will stop. Then press
the HOLD key to save the changed value. The meter returns to
FLOW mode automatically.
6. Press the
MODE
select button once to return to the "vel" mode.
The meter is now ready to measure air flow (CFM).
MIN/MAX/AVG CFM READING
Repeat steps 1-6 from earlier instructions to obtain MIN/MAX/AVG CFM
readings from a single point.
(Fig 3)
(Fig 4)
(Fig 5)
(Fig 6)
DAFM2-MAN
P. 2
