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Summary of Contents for UEi DAFM4
- Page 1 DAFM4 Digital Air Flow Meter INSTRUCTION MANUAL ENGLISH DAFM4 MODE HOLD START STOP EXIT LW-D-AREA MAX / MIN [HOLD TO EXIT AVG MODE] ON / OFF (SET) 1.800.561.8187 information@itm.com www. .com...
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Page 2: Table Of Contents
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 .......... -
Page 3: Introduction
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. -
Page 4: Controls And Indicators
CONTROLS AND INDICATORS MODE HOLD START/ STOP EXIT LW-D-AREA MAX / MIN [ HOLD TO EXIT AVG MODE] ON / OFF (SET) 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. -
Page 5: Figures And Components
) 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. -
Page 6: Measuring Air Volume (Cfm Or Cmm)
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. -
Page 7: Timed Average Air Volume
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 (... -
Page 8: Access Hole Spacing
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. -
Page 9: Diagram Of Locations
DIAGRAM OF LOCATIONS 1.8” 6.9” 12” 17.1” 24” 22.2” DAFM4 MODE HOLD START STOP EXIT LW-D-AREA MAX / MIN [HOLD TO EXIT AVG MODE] 24” ON / OFF (SET) Access Hole Location 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. -
Page 10: Estimating Free Area (Effective Area) Of A Grill
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. -
Page 11: Maintenance
MAINTENANCE LOW BATTERY When the low battery “ ” icon appears on the display, all readings will change to “ “ to prevent inaccurate results. Change the 9V battery located in the inner compartment on the rear of the instrument. CLEANING Periodically clean your meters case using a damp cloth (not wet) only. -
Page 12: Specifications
SPECIFICATIONS: English Metric Air Velocity Range 99 ~ 3937 ft/min 0.5 ~ 20 m/s Air Velocity Resolution 0.1 ft/min 0.1 m/s Air Velocity Accuracy ±(3% or reading + ±(3% or reading + 39 ft/min) 0.2m/s) Temperature Range -4 ~ 140°F -20 ~ 60°C Temperature Resolution 0.1°F 0.1°C...
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