UEi DAFM3 User Manual

1-800-547-5740 • Fax: [phone]

www.ueitest.com • email: [e-mail]

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.