UEi DAFM4 Manuel utilisateur

DAFM4

CFM

VOL

MODE HOLD START

STOP

EXIT

[HOLD TO EXIT

AVG MODE]

LW-D-AREA

ON / OFF

(SET)

MAX / MIN

AVG

INSTRUCTION MANUAL

ENGLISH

Digital Air Flow Meter

DAFM4

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TABLE OF CONTENTS

Introduction ................................................................................................3

Safety..........................................................................................................3

Controls and Indicators ..............................................................................4

Figures and Components............................................................................5

Operating Instructions

Disable Auto Power Off....................................................................5

Selecting Units..................................................................................5

Basic Measurement...................................................................... 5-6

Measuring Air Volume (CFM or CMM)

Entering Duct Information ................................................................6

Timed Average Air Volume...............................................................7

Measurement Location and Method............................................ 7-8

Access Hole Spacing ........................................................................8

Sample Calculated Locations ...........................................................8

Diagram of Locations........................................................................9

Round Duct Access Hole Location ...................................................9

Estimating FREE AREA (Effective area) of a Grill ....................................10

Maintenance

Low Battery ....................................................................................11

Cleaning ..........................................................................................11

Battery Replacement ......................................................................11

Specifications ...........................................................................................12

Warranty and Service Information ..........................................................15

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INTRODUCTION

The DAFM4 Anemometer/Psychrometer is designed with 6 HVAC/R

parameters in one instrument. These are included in a portable, battery-

operated instrument for measuring humidity, air temperature, dew point,

wet bulb, air velocity and air volume. The small vane probe includes

sensors for velocity, temperature and humidity all on a telescoping

extension, making in-duct and surface measurements possible.

FEATURES

• Measures air velocity, temperature, and relative humidity (RH%)

• Calculates wet-bulb temperature, dew point, and air volume

(CFM, CMM)

• 0.7” Small diameter air vane on 39” long telescoping probe

• Timed accumulative average for air volume with one hour maximum

• Min/Max and Hold

• English/Metric Scales

• Fast response

• Auto-power off (can be disabled)

• Low battery indicator

INCLUDED

• DAFM4 Meter

• Remote telescoping mini-vane probe

• Battery (1 x 9V)

• 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 the instrument.

CAUTION! Do not strike the fan portion of the probe.

Damage could result, reducing accuracy or functionality.

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CONTROLS AND INDICATORS

1. On/Off (Setup): Press brieﬂy to power meter on. Press and hold

to turn the meter off.

•Note: When the meter is OFF, press more than two seconds

to enter SETUP mode.

2. HOLD: Freezes display reading for current parameter

3. MODE: Press to scroll through available measurements of

velocity, air ﬂow, ambient temperature, relative humidity,

wet-bulb temperature, and dew point temperature.

4. EXIT: Use to exit setup.

•Note:Press and hold to exit timed average display

5. START/STOP: Press to begin timed average. Press a second

time to pause timed average.

6. LW-D-AREA: Press when setting up area for calculation of air

volume. Pressing repeatedly scrolls through the three options.

(LW-Length/Width, D-Diameter, A – Area)

7. MIN/MAX AVG ( ): Press to display minimum or maximum

values for any measurement. Press when in timed average to

display average, minimum or maximum air volume.

[HOLDTO EXIT

AVG MODE]

START/

STOP

HOLDMODE

EXIT LW-D-AREA

ON / OFF

(SET)

MAX / MIN

AVG

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FIGURES AND COMPONENTS

OPERATING INSTRUCTIONS

DISABLE AUTO POWER OFF

With the meter off, press and hold ON/OFF and HOLD for more than two

seconds. The display will show an “n” indicating that auto power off is

disabled.

SELECTING UNITS

• With the meter off press and hold ON/OFF (Set) button for more

than two seconds.

• Press MIN/MAX AVG ( ) to select unit (P10)

• Press or to switch units

• Press MIN/MAX AVG ( ) to select choice

• Press EXIT to return to normal operation

BASIC MEASUREMENT

When the DAFM4 is ﬁrst powered on, air velocity is the default display.

To view other parameters press “MODE” key. Each parameter will be

displayed in turn.

• VEL – Air Velocity

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OPERATING INSTRUCTIONS CONT.

• VOL – Air volume in CFM or CMM, based on dimensions entered

Note: Icon at bottom of screen will indicate the method used to

calculate volume (LW-Length/Width, D-Diameter, A – Area).

• AT – Ambient Temperature measured at the probe tip

• RH – Relative Humidity measured at the probe tip

• WBT – Wet Bulb Temperature calculated from measured

temperature and RH%

• DP – Dew Point Temperature calculated from measured

temperature and humidity

MEASURING AIR VOLUME (CFM OR CMM)

Measuring air volume with the DAFM4 has two steps. The ﬁrst step is

to enter the characteristics of the area being measured. There are three

methods to enter this and depend on the location of your measurement.

If measuring square duct work (in-duct or exit) you would enter Length

and Width (LW). For round duct you would enter Diameter (D). If

measuring the exit with a grill it is recommended to use the effective

area or free area (A) from the grill manufacturer. If this is not known, the

air volume measurement will be an estimate. (See P. 9-10)

Note: Grill manufacturers often provide engineering data on

effective or free area. This is indicated as the Ak value.

ENTERING DUCT INFORMATION

1. Press MODE until VOL is showing in the upper right corner of the

display

2. Press LW-D-AREA until the desired method is showing in the

lower left corner of the display

3. Press MIN/MAX AVG ( ) to select this mode

a. Press (HOLD) to increase the value

b. Press (LW-D-AREA)to decrease the value

c. Press MIN/MAX AVG ( ) to accept the displayed value

Note: Press and hold to scroll through the values quickly.

Release and then press brieﬂy to increase or decrease one

digit at a time.

After entering the duct characteristics you will be taken back to the

display for Air Volume. Hold the probe in the area to be measured for a

direct display of air volume.

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MEASURING AIR VOLUME (CFM OR CMM) CONT.

TIMED AVERAGE AIR VOLUME

1. Press MODE until VOL is showing in the upper right corner of

the display

2. Enter duct dimensions using the method described on page 6

3. Extend the probe to the width of the duct or more

4. Verify that you are aiming the “Air In” into the air ﬂow. This

is the side opposite of the inch/cm markings on the probe

extension. The grooves of the probe should be perpendicular to

the air ﬂow direction

5. Insert probe into duct access hole (3/4” hole required)

a. See “Measurement Location and Method” for instructions on

where to measure

6. Start with the probe inserted just inside the access hole

7. Press “START” to begin timed average

8. Slowly move probe into the duct until it crosses the duct and

contacts the far side

9. Press “STOP” to interrupt timed average. The cumulative timer

will stop when the DAFM4 is not capturing data

10.Move to the next access hole and repeat steps 6~9.

11.Press MIN/MAX AVG ( ) after capturing data on all access

holes to view average volume

a. AVG ﬂashing and elapsed time will show when displaying

average

b. AVG ﬂashing, elapsed time and MIN will show minimum

measured volume

c. AVG ﬂashing, elapsed time, and MAX will show maximum

measured volume

12.Press and hold EXIT to end test

MEASUREMENT LOCATION AND METHOD

There are recommended methods to traverse a duct in order to collect

sufﬁcient data for an accurate average. Using a timed average increases

the number of data points for a much more accurate result. It is still

recommended to use the approach taken by the Log-Tchebycheff Rule

for access hole spacing, but the number of data points is not needed. By

utilizing a timed average you will capture these locations, plus data from

the entire width of the duct being measured.

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MEASURING AIR VOLUME CONT.

We recommend the following number of access holes depending on duct

size;

• 18” or less – Two access holes 6” apart

• 18”~30” – Five access holes

• 30”~36” – Six access holes

• Greater than 36” – Seven access holes

ACCESS HOLE SPACING

Use the Log-Tchebycheff Rule for rectangular ducts to determine spacing

for access holes.

Number of access

holes per side

Position relative to inner wall

(multiplier)

50.074, 0.288, 0.500, 0.712, 0.926

60.061, 0.235, 0.437, 0.563, 0.765, 0.939

70.019, 0.153, 0.217, 0.361, 0.639, 0.783,

0.847, 0.923, 0.981

Example – for a 20” inside dimension select 5 access holes.

•Access 1, 20 x 0.074 = 1.48” from wall (use 1 ½“)

•Access 2, 20 x 0.288 = 5.76” from wall (use 5 ¾”)

•Access 3, 20 x 0.500 = 10” from wall (use 10“)

•Access 4, 20 x 0.712 = 14.24” from wall (use 14 ¼“)

•Access 5, 20 x 0.926 = 18.52” from wall (use 18 ½“)

SAMPLE CALCULATED LOCATIONS

Access

Holes

5Access

Holes

6Access

Holes

Width 24 Width 30 Width 36

0.074 1.8 0.061 1.8 0.053 1.9

0.288 6.9 0.235 7.1 0.203 7.3

0.500 12.0 0.437 13.1 0.366 13.2

0.712 17.1 0.563 16.9 0.500 18.0

0.926 22.2 0.765 23.0 0.634 22.8

0.939 28.2 0.797 28.7

0.947 34.1

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DIAGRAM OF LOCATIONS

ROUND DUCT ACCESS HOLE LOCATION

For round ducts drill three holes at 60 degrees separation. This will

allow you to cover all locations recommended using the log-Tchebycheff

method for round ductwork.

Locate all access holes in a straight section of ductwork.

24”

1.8”

6.9”

12”

17.1”

22.2”

DAFM4

CFM

VOL

MODE HOLD START

STOP

EXIT

[HOLDTO EXIT

AVGMODE]

LW-D-AREA

ON/ OFF

(SET)

MAX/ MIN

AVG

Access Hole Location

Access

Holes

D(<10”)

60º

Log-Tchebycheff Rule for Round ducts

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ESTIMATING FREE AREA (EFFECTIVE AREA) OF A GRILL

To obtain air volume on a grill with unknown effective or free area

you must estimate the free area. This is difﬁcult, but can provide an

estimate of the volume for comparison testing. If multiple grills of the

same design are compared using this method, you will have an accurate

relative comparison, although the actual value may not be known.

Method 1

• Measure length and width in inches.

• Obtain overall area in square inches by multiplying length

times width.

• Divide square inches by 144 to convert to square feet.

• Multiply the result by 0.70 (70%) to estimate the actual

open area.

Note: For return registers that are more open, increase the factor to

0.9 (90% open). For louvered registers with much more covered area

decrease to 0.5 or 0.6 (50~60% open).

Example – 4”x10” residential ﬂoor register

•Step 1 – 4” and 10”

•Step 2 – 4 x 10 = 40 square inches

•Step 3 – 40 ÷ 144 = 0.2777 square feet

•Step 4 – 0.277 x 0.70 = 0.194 square feet

(use this when entering free area “A” on the DAFM4)

Method 2

Measure the grill area inside the frame of the register, calculate area in

square inches and convert to square feet using the method 1 steps. You

do not need to perform step 4.

Example – 4”x10” ﬂoor register

•Step 1 – actual louver area dimensions are 9” x 3.5”

•Step 2 – 9 x 3.5 = 31.5 square inches

•Step 3 – 31.5 ÷ 144 = .219 square feet

Note: This method may result in a slightly elevated result as it does not

fully remove the louvers that are in the air path.

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