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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.

www.

.com

[email protected]

1.800.561.8187

Summary of Contents for DAFM4

Page 1: ...DAFM4 CFM VOL LW 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 www com information itm com 1 800 561 8187 ...

Page 2: ...MM 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 www com information itm com 1 8...

Page 3: ... 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 th...

Page 4: ...IT 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...

Page 5: ...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 ww...

Page 6: ...uring 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 t...

Page 7: ...imed 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...

Page 8: ...765 0 939 7 0 019 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 Access 2 20 x 0 288 5 76 from wall use 5 Access 3 20 x 0 500 10 from wall use 10 Access 4 20 x 0 712 14 24 from wall use 14 Access 5 20 x 0 926 18 52 from wall use 18 SAMPLE CALCULATED LOCATIONS Access Holes 5 Access Holes 6 Access Holes...

Page 9: ...nded using the log Tchebycheff method for round ductwork Locate all access holes in a straight section of ductwork 24 24 1 8 6 9 12 17 1 22 2 DAFM4 CFM VOL LW MODE HOLD START STOP EXIT HOLD TO EXIT AVG MODE LW D AREA ON OFF SET MAX MIN AVG Access Hole Location Access Holes D 10 60º 60º Log Tchebycheff Rule for Round ducts www com information itm com 1 800 561 8187 ...

Page 10: ...isters 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 fram...

Page 11: ...ing a damp cloth not wet only DO NOT use abrasive flammable liquids cleaning solvents or strong detergents as they may damage the finish impair safety or affect the reliability of the structural components BATTERY REPLACEMENT Remove screw from the battery compartment cover on the back of your meter and remove cover Replace battery with a fresh 9 Volt battery paying attention to polarity Replace co...

Page 12: ...1 99 9 RH RH Resolution 0 1 RH RH Accuracy 3 RH at 77 F 25 C and 10 90 RH 5 at others Wet bulb range 4 158 F 20 70 C Wet bulb resolution 0 1 F C Air volume display 0 99999 CFM m3 s Air volume resolution 0 1 0 9999 9 1 10000 99999 LCD Size HxW 1 38 x 2 13 inches 35 2 x 54 mm Operating temperature range 32 122 F 0 50 C Operating RH Less than 80 handset Storage temperature range 4 122 F 20 50 C Stora...

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