1-800-547-5740 • Fax: (503) 643-6322
www.ueitest.com • email: info@ueitest.com
DAFM3
INSTRUCTION MANUAL
2. The fan and meter are sold as a kit and are calibrated to each
other. Please don't connect the fan with another DAFM3 or other
similar anemo-psychrometers because the characteristic of each
fan is different.
C o n t r ols and Indicators
1. ON/OFF: Turns ON the meter with auto-sleep mode. Turns OFF
the meter at any mode.
NOTE: When the meter is OFF, press more than two seconds to
enter “UN ITS” selection.
2. MODE: Press to select different modes (Temp, DP, WB, RH,
Velocity). Press and hold to select “VOLUME” function.
3. ENTER: To confirm the setting and calibration. Press and hold to
select the method to enter “AREA for VOLUME”.
Length/Width (LW) for open rectangular duct, Diameter (D) for
open round ductwork, and Area (A) to enter the specified grill
free area (Ak) information.
NOTE: Also used to recall values stored in memory for multipoint average.
4. MIN/MAX/AVG and UP: Press to view Minimum, Maximum,
and Average value.
• To increase digit during setup for volume.
• To view total of measured volume on multiple outlets.
5. REC/START: In velocity mode, pressing this key to store the
current velocity reading into memory.
• To start measuring volume without waiting to finish
countdown in “Volume” mode.
6. HOLD/NEXT Dgt: In basic modes press this key to hold the
current reading, then press this key again to unlock the held
reading.
• To select next digit during setup for volume.
• View last measured air volume.
Introduction
The DAFM3 Anemometer/Psychrometer meter is designed with 6
HVAC/R must have parameters in one instrument. These are included in
a portable battery operated instrument for measuring Humidity, Air
temp., Dew Point, Wet Bulb, Air Velocity and Air Volume. The sensor is
built into the remote fan and is specially protected by a twist cap.
While in operation, open the cap for accurate temperature and humidity
readings.
Features include
• Measures Air Velocity, Temperature and Humidity
• Calculate Wet Bulb, Dew Point, and Air Volume (CFM, CMM)
• Protective twist cap for temperature/humidity sensor
• 8-Point Average for Air Velocity
• 60 Second Average for Air Volume
• Total Volume from multiple outlets
• Large LCD digital display
• Professional remote vane
• English/Metric scales
• Low battery indication
• Fast response
• Microprocessor circuitry for reliability
• Auto Power Off selectable
• Powered by 4 “AAA” batteries
Features include
• DAFM3 Anemometer/Psychrometer Meter
• Remote Vane
• Batteries (4)
• User manual
• Hard carrying case
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.
CAUTION!
Objects striking the fan may damage meter.
LCD Display Functional Description
1. Rotate the protective cover in the center of the fan to open before
measurement to ensure the measured data is correct.
DAFM3-MAN P. 1
CLOSED
OPEN
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Basic Measurement
When you first turn the unit on the air temperature is the default value
to show on the LCD. To review the other basic parameters, just press the
“MODE” key. Each parameter will be displayed in turn.
Parameters Measured will cycle through the following in order
• Dry Bulb Temperature
• Dew Point Temperature (DP)
• Wet Bulb Temperature (WB)
• Relative Humidity (RH%)
• Air Velocity
MIN/MAX/AVG
All modes will capture the average (AVG), minimum (MIN) and
maximum (MAX) value since the meter was powered on. Select
AVG/MIN/MAX by pressing this button. Pressing “MODE” while
displaying “MIN/MAX” or “AVG” will scroll through available readings.
Each mode will also provide a choice of MIN/MAX or AVG.
Velocity with Average
The DAFM3 has the ability to capture up to eight values for velocity, and
then display the minimum, maximum and average of these readings.
The maximum number of records is 8 points.
1. Store readings while in the measurement mode by pressing
“RECORD” (up to 8 points of data).
2. Press “ENTER” to view results.
NOTE: “REC H” will display in the lower left of the display.
3. Press “MIN/MAX/AVG” to cycle through the calculated values.
Air Volume Note
The DAFM3 will also calculate air volume for supply or return air flow.
The meter will measure velocity and then utilize the area entered to
calculate volume.
The critical aspect of this function is to have the correct area. There are
three methods used to enter area, but consider the following.
Dimensional outlet size can only be used on ductwork that does not
have a grill over the opening. The louvers and frame on the grill reduce
the effective open area so that the space available for airflow is less
than what the outside dimensions would calculate.
DAFM3-MAN P. 2
Operating Instructions
Disable Auto Power Off
With the meter off, press and hold “MIN/MAX” then press and hold
“ON/OFF”“ until the meter beeps.
Selecting Units
With the meter off press and hold the “ON/OFF” button for more than
two seconds. The display will show only the units portion.
Use the “UP” or “NEXT Dgt” buttons to alternate between the available scales. When the scale desired is showing press the “ENTER” button to save. The units available are Ft, in, cm.
Ft Range
Select these units to enter free area specification from grill manufacture.
Free Area is not a calculated area based on grill dimensions, but
accounts for the space between louvers. It is often referred to as Ak, or
effective area. The following figure represents these units.
INCH
Select these units if measuring open ductwork and you wish to enter the
length and width or diameter in inches. It can also be used to enter
specified grill free area provided by manufacture in square inches for
the Ak number.
CM
Select these units for metric scales. The temperature is ˚C, and velocity
and volume are in meters per second and cubic meters per minute.
As an example a 12” x 12” grill would equal one square foot (length x
width, 1 ft x 1 ft = 1 sq foot), but with the fins of the grill in that space it
may only have an effective area of 0.5 square feet or less. Grill manufactures perform testing to evaluate the effective area of a grill, and considers not only the space between the grill, but the pressure created by
the air flowing against these fins.
For the most accurate results, please obtain the effective area or free
area from the grill manufacture. This is often listed as the Ak value.
Air Volume Measurement
While in basic mode, press “MODE” for over 2 seconds to enter volume
measurement mode. Press and hold “MODE” for more than 2 seconds
to return to basic mode.
The steps to capture volume on open ductwork are the following:
1. Enter the free area.
a) Use dimensions for open ductwork.
• Length and width for rectangular ductwork
• Diameter for circular ductwork
b) Use the manufacture value for effective or free area (Ak).
2. Hold the air vane in the air flow area and press “START”.
3. Move the air vane slowly over the entire face or open area
during the 60 second countdown.
4. View the results after the meter emits a beep (the end of the 60
second sample time).
To repeat this on additional registers press and hold “ENTER” to return
to step 1.
Additional outlets can be measured and then the total of all measurements can be viewed. After measuring the volume, and while displaying
the result, press the “[Total Volume]” button. It will list the number of
tests in the upper left and the total volume. Return to the results of the
last test by pressing “[Last Volume]”.
Entering Free Area
There are three methods to enter the area used to calculate volume.
The units also change the numbers that would be entered.
The three methods are Length and Width (LW) for rectangular ducts,
Diameter (D) for circular ducts, and AREA to enter in the grills free area
specification from the manufacture.
Units will determine what values are entered.
• Use “IN” for open grills and when manufacture specifications
provide square inches for the effective area.
• Use “Ft” for Ak numbers provided in square feet.
NOT E : LW and D inches can be conv e rted to feet by dividing by 12.
• Use the “CM” scale to obtain cubic meters per minute and when
grill specifications are in square centimeters for free area.
• Length and Width
This is the default choice when entering the volume mode, and will
start with entering the length. You can determine that the meter is in
this mode with the L in the lower left corner.
NOTE: To convert dimensions in inches to feet divide by 12. On the
above image 8” length ÷ 12” = .667 Ft for L, and 4” width ÷ 12” =
.333 Ft for W.
Press the “UP” key to increase the value of the flashing digit. Press
the “NEXT Dgt” key to select the next digit. You can cycle through all
of the digits until the correct value has been entered. Press “ENTER”
when the correct length has been selected. This will advance you to
the width mode (W in the lower left portion of the display).
Press the “UP” key to increase the value of the flashing digit, and
then “NEXT Dgt” to select the next digit. After you have the correct
value press “ENTER” to advance to the measurement mode for volume.
NOT E : The meter will provide a 20 second countdown so you can position the air vane near the grill or opening. If you do not need the entire
20 seconds simply press “STA R T” .
The meter will average the measurement over a 60 second timeframe. Continue to move the air vane across the entire area being
measured to obtain the most accurate value. The meter will beep at
the end of the test, and the display will hold the volume measured.
Press “ENTER” to repeat the volume test on additional registers or openings. The meter will return to the LW area enter mode, but will retain the
last entered values. If measuring a round duct or specific grill press and
hold “ENTER” to advance to the alternative area modes
• Diameter
The second option is using diameter of the duct.
After entering the Volume Mode, press and hold “ENTER” to advance
to the diameter entrance mode. You can confirm this by observing the
“D” in the lower left area of the display. Enter the correct value using
the same method listed for Le n gth and Width values.
NOTE: 8”diameter duct. If entering diameter in “F t ” scale divide
diameter by 12. (8 ÷ 12 = .667 feet)
DAFM3-MAN P. 3
• Area
While in diameter setting mode, press the “ENTER” key for over two
seconds to enter area setting.
Enter the specified grill free area obtain from the manufacture using
the “UP” key to increase the value of the flashing digit, and the
“NEXT Dgt” key to move to the next digit. Press “ENTER” after the
correct value has been selected.
Air Volume: Measurement
After pressing “ENTER” to exit the size mode the meter waits 20 seconds to provide time for you to put the vane up to the grill. During the
20 second waiting time a countdown timer is displayed on top left corner. The meter beeps when time is up. To skip the 20 second countdown press “START” when ready.
The meter measures the volume for 60 seconds and calculates the average. During this 60 second time, the vane should be moved along the
entire outlet area. The count down timer displayed on the top left corner will show remaining time. The meter beeps when 60 seconds are
completed.
At the end of the 60 second countdown the meter will show the measured volume. To measure additional outlets press the “ENTER” key to
repeat the procedure (This will return you to the area entrance screen
for LW).
Total volume of all measurements is displayed by pressing the
“MIN/MAX/AVG” key after completing the above test. You can return
to the last value measured by pressing the “HOLD/DOWN” key. With
the last value displayed you can repeat the test for additional outlets,
adding to the total already measured.
Exiting the volume measurement mode will reset the total stored value.
Low-Battery
Two level battery indication:
Level 1: Battery indicator will flash at level 1. In this situation, the
meter will work normally, however users should prepare to
replace the batteries.
Level 2: Battery indicator will always display on the LCD. In this level
change batteries immediately.
M a i n t e n a n c e
Periodic Service
WARNING!
Repair and service of this instrument is to be performed by qualified
personnel only. Improper repair or service could result in physical
degradation of the meter. This could alter the protection from
electrical shock and personal injury this meter provides to the
operator. Perform only those maintenance tasks that you are
qualified to do.
Cleaning
Pe r i o d i cal ly clean your meter’s case using a damp cloth. DO NOT u s e
a b rasive, flammable liquids, cleaning solvents, or strong detergents as
they may damage the finish, impair safety, or affect the reliability of the
s t r u c t u ral components.
Battery Replacement
Remove screw from battery compartment cover on back of meter and
remove cover. Replace battery with a fresh 9 Volt battery paying attention
to polarity position. Replace cover and screw.
Tro u b l e s h o o t i n g
DAFM3-MAN P. 4
Power on but Press the power key more than 3 seconds
no display Replace the battery and try again
Remove the battery and wait one minute
Reinstall and try again
E1 The probe is not connected or damaged
E2 The value is underflow
E3 The value is overflow
E4 The original data that is relative to this
value has an error
E5 Out of meter display range
E6 The value is not calculated completely
E11 Humidity Calibration error
DAFM3-MAN P. 5
S p e c i f i c a t i o n s
Temperature -4˚ to 140˚F (-20˚ to 60˚C)
Accuracy: ±1˚F (+0.6˚C)
Resolution: 0.1˚F (0.1˚C)
Relative Humidity 0 to 100% RH
Accuracy: ±3% at 10 to 60% RH
±5% at other range
Resolution: 0.1%
Dew Point -90˚ to 158˚F (-68˚ to 70˚C)
Accuracy: ±3% at 10 to 60% RH
±5% at other range
Resolution : 0.1˚
Wet Bulb -7.6˚ to 158˚F (-22˚ to 70˚C)
Temperature Accuracy: ±3% at 10 to 60% RH
±5% at other range
Resolution : 0.1˚
Air Velocity 0.3 to 35 m/s (1 to 114 ft/s)
Accuracy: ±5%
Resolution : 0.1˚ m/s
Air Volume 0 to 99999 m /s (0 to 99999 cfm)
Accuracy: ±5%
Resolution: 0.1(0 - 9999.9) or
1 (10000 - 99999)
Power (1) 9V Alkaline battery or
9V > 200mA adapter
Dimensions Meter: 175 x 70 x 33 mm
Vane: 170 x 77 x 40 mm
3
Limited Warranty
The DA F M3 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
r e p a i r able) for a service charge. Return the unit postage paid and insured to:
1-800-547-5740 • FAX: (503) 643-6322
www.ueitest.com • Email: info@ueitest.com
This warranty gives you specific legal rights. You may also have other rights which vary from
state to state.
DAFM3
Digital Air Flow Meter
Copyright © 2008 UEi DAFM3-MAN 2/08
PLEASE
RECYCLE
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