Universal Enterprise DAFM2 Installation Manual

1-800-547-5740 • Fax: [phone]

www.ueitest.com • email: [e-mail]

DAFM2

INSTRUCTION MANUAL

Introduction

The DAFM2 is used to check air velocity FPM (feet per minute) and
CFM (cubic feet per minute) in residential, light commercial and
standard commercial systems. This meter eliminates the need for
analog charts. It is a hand-held, battery-powered meter, that makes
air flow and velocity measurements with an accuracy of ±2%.
Temperature measurements are made with an accuracy of ±1%.

Features include

• Convenient direct digital readout of actual air flow or velocity with
out using conversion charts

• Large dual digital display for simultaneous air flow or velocity
and temperature measurements

• Air flow and velocity measurements accurate to ±2%

• Temperature measurements accurate to ±1˚F (±0.6˚C)

• Battery saving automatic power off

• Low battery icon

• Data hold function

• MAX/MIN/AVG recording function

Safety Notes

Before using this meter, read all safety information carefully. In
this manual the word "WARNING" is used to indicate conditions
or actions that may pose physical hazards to the user. The word
"CAUTION" is used to indicate conditions or actions that may
damage this instrument.

WARNING!

Objects striking the fan may damage meter.

C o n t r ols and Indicators

1. ON/OFF RESET

2. MODE (Select)

• VEL (FPM)

• FREE AREA

• FLOW (CFM)

3. HOLD ADVANCE

4. MIN/MAX RECORD Single Print

5. NEXT DIGIT Multi-point Average

Operating Instructions

Measuring Air Velocity

(Single Point) feet per minute (FPM)

1. Press the “ON/OFF” button to turn the meter on. Every display
feature will appear for a few seconds when the meter is
turned ON.

2. The DAFM2 is ready for use when the LCD displays "vel"
(the default mode) in the upper left corner, and the temperature
appears in the lower right corner (Fig 1).

3. Hold the sensor in front of an air source. The meter will display
Feet Per Minute (FPM) readings.

Displaying a continuous moving average

The DAFM2 has the ability to display a continuous moving average for
up to two hours.

1. Turn the power ON.

2. Place the sensor in front of an air flow source.

3. Press MIN/MAX record key once. An AVG in the lower left
corner of the display confirms the meter is in the continuous
moving average measurement mode. The display will update
once per second (Fig 2).

MIN/MAX/AVG (Single Point)

To obtain MIN/MAX/AVG readings on a single point.

1. Turn the meter ON.

2. Place the sensor in front of an air flow source.

1

4

2

5

(Fig 1)

(Fig 2)

DAFM2-MAN P. 1

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/M A X” 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 "ve l " 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

Troubleshooting

Low battery icon visible on display or no display

Change the 9 volt battery in the meter.

E6 or continuous beeping

This signal indicates the probe is disconnected from the meter body or
is not properly connected.

Sensors fan will not turn

Purchase new sensor probe.

Battery Replacement

This meter requires a standard 9 volt batter for operating power.
Remove the screw from the lower back of the meter. Lift the panel out
and remove the battery. Reverse the process to install a new battery and
replace the cover.

Specifications

3. The meter will now display an average air flow reading and
the number of points measured (Fig 7).

The meter's free area dimension has been set to 1.111 square feet, a
commonly-used free area dimension in the U.S. If you want to measure
the air flow for a single point without changing the area dimension,
power the meter ON, position the fan, and then press the “MODE” key
twice. This will put you into air flow (CFM mode. The air flow (CFM)
display is equal to the current air velocity reading (FPM x FREE AREA =
CFM) times 1.111 square feet.

SUGGESTION: Set the free area dimension before starting to measure
the air velocity, so after you measure the air velocity, you can jump to
the air flow mode to view the cubic feet per minute reading without
further changing the free area dimension.

Non Sleep Mode
To bypass the auto power off:

For continuous operation, press the “ON” and “HOLD” buttons at the
same time, then release ON only. An "n" will appear on the LCD. You
can then release the “HOLD” key. The meter will remain ON until the
meter is turned off.

Changing default settings

1. The default setting for the air velocity measuring unit is
"feet/minute". The default setting for the unit of
temperature is "F". To change the measuring units to
"meters/sec" and "C".

a. Turn the meter ON by pressing the “ON” and “AVERAGE”

keys at the same time. Release “ON” button first. The LCD
will display a small signal, "ft/m", in the upper right
corner and an ˚F in the lower right corner. Then release
the “AVERAGE” key.

b. Press the “HOLD” key to change the measuring units to

the metric system. Press the “AVERAGE” hey to return to
the SAE/imperial measuring units.

c. Press the “RECORD” key. An "S" will show on the LCD.

Press the “HOLD” key to confirm and save the changed
value. At this time, "2400” appears on the LCD. Press
“RECORD”. An "S" appears on the LCD. Press the “HOLD”
key to confirm, and save the value.

Auto power off

The meter will turn off automatically after 20 minutes, to save the bat­tery. This will be preceded by three (3) beeps.

(Fig 7)

Airflow:

Digital display (LCD):

Temperature:

Battery type:
Battery life:

Display type:
Display size:

Max reading:

Size (H x W x D)

Diameter of fan:

Auto power off:

125 - 4900 ft/min

0.7 - 25 m/sec

Counts - 4000
Updates 3 times/sec

-10˚ to +50˚C
14˚ to +122˚F

9 volt
100 hrs. typical (alkaline)

LCD
1 1/4" x 1 5/8"

(37 mm x 42 mm)

9999

7 1/8" x 2 3/4" x 1 3/8"
(181 mm x 71 mm x 38 mm)

2 7/8" (70 mm)

20 minutes bypass

Airflow
125 - 4900 ft./min.

0.7 - 25 m/sec

Temperature

-10 to 50˚C
+14 to 122˚F

Resolution
1

0.01

0.1

0.1

Accuracy

±2%
±2%

±0.6˚C
±1.0˚F

ACCURACY

DAFM2-MAN P. 3

Limited Warranty

The DA F M2 is warranted to be free from defects in materials and workmanship for a period
of one year from the date of purchase. If within the warra n ty period your instrument should
become inoperative from such defects, the unit will be repaired or replaced at UEi’s option.
This warra n ty covers normal use and does not cover damage which occurs in shipment or
failure which results from alteration, tampering, accident, misuse, abuse, neglect or improper
maintenance. Batteries and consequential damage resulting from failed batteries are not
covered by warra n ty.

Any implied warranties, including but not limited to implied warranties of merchantability
and fitness for a particular purpose, are limited to the express warranty. UEi shall not be
liable for loss of use of the instrument or other incidental or consequential damages,
expenses, or economic loss, or for any claim or claims for such damage, expenses or
economic loss. A purchase receipt or other proof of original purchase date will be required
before warra n ty repairs will be rendered. Instruments out of warra n ty will be repaired
(when repairable) for a service charge. Return the unit postage paid and insured to:

1-800-547-5740 • FAX: [phone]

www.ueitest.com • Email: [e-mail]

This warranty gives you specific legal rights. You may also have other rights which vary from
state to state.

DAFM2

Digital Air Flow Meter

Copyright © 2007 UEi DAFM2-MAN 1/07

PLEASE

RECYCLE